2021 Assam earthquake - Revision history

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	==See also==		==See also==
	~~{{Portal\|India\|Earth sciences}}~~
	*[[List of earthquakes in 2021]]		*[[List of earthquakes in 2021]]
	*[[List of earthquakes in India]]		*[[List of earthquakes in India]]

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	{{Earthquakes in India}}		{{Earthquakes in India}}
	{{Himalayan earthquakes}}		{{Himalayan earthquakes}}

			{{#seo:
			\|keywords=2021 earthquakes, Earthquakes in India, Earthquakes in Assam, Earthquakes in Bhutan, 2021 disasters in India, 2021 earthquakes in Asia
			\|description=
			}}

	[[Category:2021 earthquakes]]		[[Category:2021 earthquakes]]

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			{{Short description\|Earthquake in India}}
	{{Infobox earthquake		{{Infobox earthquake
	\| isc-event = 620343980		\| isc-event = 620343980
	\| magnitude = {{M\|w\|link=y}} ~~6.0~~<ref name="USGS">{{cite web \|title=M 6.0 - 9 km NNW of Dhekiajuli, India \|url=https://earthquake.usgs.gov/earthquakes/eventpage/us7000dy3b/executive \|website=earthquake.usgs.gov \|publisher=USGS \|access-date=14 May 2021}}</ref><br> 6.4 <ref>{{cite web \|title=Strong earthquake of 6.4 magnitude hits Assam \|url=https://www.businesstoday.in/latest/trends/breaking-earthquake-of-64-magnitude-hits-assam/story/437724.html \|publisher=[[Business Today (India)]] \|access-date=28 April 2021}}</ref>		\| magnitude = 6.0 {{M\|w\|link=y}}<ref name="USGS">{{cite web \|title=M 6.0 - 9 km NNW of Dhekiajuli, India \|url=https://earthquake.usgs.gov/earthquakes/eventpage/us7000dy3b/executive \|website=earthquake.usgs.gov \|publisher=USGS \|access-date=14 May 2021}}</ref>
	\| local-time = 07:51 [[Time in India\|(IST)]]		\| local-time = 07:51 [[Time in India\|(IST)]]
	\| location = 26.77 N ; 92.43 E		\| location = {{Coord\|26.781\|N\|92.457\|E}}
	\| anss-url = https://earthquake.usgs.gov/earthquakes/eventpage/us7000dy3b/		\| anss-url = https://earthquake.usgs.gov/earthquakes/eventpage/us7000dy3b/
	\| name = 2021 Assam earthquake		\| name = 2021 Assam earthquake
	\| timestamp = 2021-04-28 02:21:26		\| timestamp = 2021-04-28 02:21:26
	\| ~~map~~ = {{Location map+\|India~~\|width=250\|float=none\|border=none\|relief=yes\|caption=\|places=~~		\| map2 ={{Location map\|India Assam#India
	~~{{Location map~\|India~~\|lat=26.77\|long=92.43\|mark=Bullseye1.png\|marksize=40\|position=top\|label=}}		\|lat=26.77
	}}		\|long=92.43
			\|mark=Bullseye1.png
			\|marksize=50
			\|position=top
			\|width=260
			\|caption=
			\|relief=yes
			\|label=}}
	\| alt =		\| alt =
	\| depth = 34 km (21 ~~miles~~)		\| depth = 34.0 km (21.1 mi)
	\| intensity = {{MMI\|VII}}		\| intensity = {{MMI\|VII}}
	\| image =		\| image =
	\| local-date = 2021~~-04-28~~		\| local-date = 28 April 2021
	\| aftershocks = ~~Six~~. The strongest so far is an {{M\|w}} 4.7 <ref>{{cite web \|title=Explained: In Assam earthquake, reminder of seismic hazard along HFT faultline\|url=https://indianexpress.com/article/explained/explained-in-assam-earthquake-reminder-of-seismic-hazard-along-hft-faultline-7292770/ \|publisher=The Indian Express \|access-date=28 April 2021}}</ref>		\| aftershocks = Several. The strongest so far is a {{M\|w}} 4.7<ref>{{cite web \|title=Explained: In Assam earthquake, reminder of seismic hazard along HFT faultline\|url=https://indianexpress.com/article/explained/explained-in-assam-earthquake-reminder-of-seismic-hazard-along-hft-faultline-7292770/ \|publisher=The Indian Express \|access-date=28 April 2021}}</ref>
	\| fault = Kopili Fault		\| fault = Kopili Fault
	\| casualties = 2 dead, 12 injured		\| casualties = 2 dead, 12 injured
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	}}		}}

	~~An earthquake of [[Magnitude (~~earthquake~~)\|magnitude]] 6.0~~ struck 11 km (7 miles) away from [[Assam\|Dhekiajuli, Assam, India]] at 07:51 [[Time in India\|(IST)]] on April 28, 2021.<ref>{{Cite web\|date=2021-04-28\|title=Northeast India hit by magnitude 6.4 earthquake\|url=https://www.independent.co.uk/asia/india/india-earthquake-today-assam-latest-b1838656.html\|access-date=2021-04-28\|website=The Independent\|language=en}}</ref> The quake struck at a depth of 34 km (21 miles), 140 km (86 miles) north of the main city of [[Guwahati]]. It resulted in two fatalities and at least 12 injuries.		The '''2021 Assam earthquake''' struck 11 km (7 miles) away from [[Assam\|Dhekiajuli, Assam, India]] at 07:51 [[Time in India\|(IST)]] on April 28, 2021 with a richter scale magnitude of 6.4.<ref>{{Cite web\|date=2021-04-28\|title=Northeast India hit by magnitude 6.4 earthquake\|url=https://www.independent.co.uk/asia/india/india-earthquake-today-assam-latest-b1838656.html \|archive-url=https://web.archive.org/web/20210428175455/https://www.independent.co.uk/asia/india/india-earthquake-today-assam-latest-b1838656.html \|archive-date=2021-04-28 \|url-access=limited \|url-status=live\|access-date=2021-04-28\|website=The Independent\|language=en}}</ref> The quake struck at a depth of 34 km (21 miles), 140 km (86 miles) north of the main city of [[Guwahati]]. It resulted in two fatalities and at least 12 injuries.

	==Tectonic setting==		==Tectonic setting==
	The tectonics of the Assam region is dominated by convergence of the India, Burma and Eurasian plates. Major fault structures like the [[Main Frontal Thrust]], Main Boundary Thrust and [[Main Central Thrust]], all splay branches of the [[Main Himalayan Thrust]], accommodate the shortening rate as India is pushing into Asia. The large 8.6 {{M\|w}} [[1950 ~~Assam-Tibet~~ earthquake\|~~Assam-Tibet~~ earthquake]] in 1950 was a megathrust earthquake that resulted from a rupture along the Main Himalayan Thrust and Main Frontal Thrust.		The tectonics of the Assam region is dominated by convergence of the India, Burma and Eurasian plates. Major fault structures like the [[Main Frontal Thrust]], Main Boundary Thrust and [[Main Central Thrust]], all splay branches of the [[Main Himalayan Thrust]], accommodate the shortening rate as India is pushing into Asia. The large 8.6 {{M\|w}} [[1950 Assam–Tibet earthquake\|Assam–Tibet earthquake]] in 1950 was a megathrust earthquake that resulted from a rupture along the Main Himalayan Thrust and Main Frontal Thrust.

	== Earthquake ==		== Earthquake ==
	[[File:2021-04-28 Dhekiajuli, India M6 earthquake ~~intensity map~~ (USGS).jpg\|right\|thumb\|Earthquake Intensity Map]]		[[File:2021-04-28 Dhekiajuli, India M6 earthquake shakemap (USGS).jpg\|right\|thumb\|Earthquake Intensity Map]]
	The earthquake occurred as a result of oblique-slip faulting at a shallow depth just at the foothills of the Himalayas.<ref>{{cite web \|title=Assam Earthquake: 6.4 magnitude quake, 7 aftershocks jolt Northeast, tremors felt in Bengal \|url=https://www.indiatoday.in/india/story/earthquake-in-northeast-tremors-felt-in-assam-north-bengal-arunachal-pradesh-1795696-2021-04-28 \|publisher=[[India Today]] \|access-date=28 April 2021}}</ref><ref>{{Cite web\|title=Official Website of National Center of Seismology\|url=https://seismo.gov.in/MIS/riseq/interactive/index/ZVNoMWsrTTlhMEZUUXN1UEgxbUcxUT09/Reviewed\|access-date=2021-05-03\|website=seismo.gov.in}}</ref> Analysis by India's [[National Centre for Seismology]] revealed that the earthquake involved slip along the Kopili Fault, near the [[Main Frontal Thrust]].<ref name="BB">{{cite news \|last1=Chakravartty \|first1=Anupam \|title=Assam earthquake: Known to cause deadly tremors, Kopili fault eludes experts \|url=https://www.eastmojo.com/assam/2021/04/29/assam-earthquake-known-to-cause-deadly-tremors-kopili-fault-eludes-experts/ \|access-date=15 May 2021 \|agency=EastMojo \|date=29 April 2021}}</ref> This is a northeast striking fault structure that runs from east of the Shillong Plateau, through the Assam Valley and into Bhutan for a total estimated length of 300 km, and a width of 30 km.<ref name="AA">{{cite journal \|last1=Kayal, J., Arefiev, S., Baruah, S., Tatevossian, R., Gogoi, N., Sanoujam, M., Gautam, J.L., Hazarika, D., & Borah, D. \|title=The 2009 Bhutan and Assam felt earthquakes (Mw 6.3 and 5.1) at the Kopili fault in the northeast Himalaya region \|journal=Geomatics, Natural Hazards and Risk \|date=2010 \|volume=1 \|issue=3 \|pages=273-281 \|doi=10.1080/19475705.2010.486561\|doi-access=free }}</ref> Its predominant slip sense is right-lateral strike-slip.<ref>{{cite web \|last1=Kharita \|first1=Akash \|title=Strong earthquake jolts Assam \|url=https://temblor.net/earthquake-insights/strong-earthquake-jolts-assam-12692/ \|website=Temblor \|access-date=15 May 2021 \|doi=10.32858/temblor.171}}</ref>		The earthquake occurred as a result of oblique-slip faulting at a shallow depth just at the foothills of the Himalayas.<ref>{{cite web \|title=Assam Earthquake: 6.4 magnitude quake, 7 aftershocks jolt Northeast, tremors felt in Bengal \|url=https://www.indiatoday.in/india/story/earthquake-in-northeast-tremors-felt-in-assam-north-bengal-arunachal-pradesh-1795696-2021-04-28 \|publisher=[[India Today]] \|access-date=28 April 2021}}</ref><ref>{{Cite web\|title=Official Website of National Center of Seismology\|url=https://seismo.gov.in/MIS/riseq/interactive/index/ZVNoMWsrTTlhMEZUUXN1UEgxbUcxUT09/Reviewed\|access-date=2021-05-03\|website=seismo.gov.in}}</ref> Analysis by India's [[National Centre for Seismology]] revealed that the earthquake involved slip along the Kopili Fault, near the [[Main Frontal Thrust]].<ref name="BB">{{cite news \|last1=Chakravartty \|first1=Anupam \|title=Assam earthquake: Known to cause deadly tremors, Kopili fault eludes experts \|url=https://www.eastmojo.com/assam/2021/04/29/assam-earthquake-known-to-cause-deadly-tremors-kopili-fault-eludes-experts/ \|access-date=15 May 2021 \|agency=EastMojo \|date=29 April 2021}}</ref> This is a northeast striking fault structure that runs from east of the Shillong Plateau, through the Assam Valley and into Bhutan for a total estimated length of 300 km, and a width of 30 km.<ref name="AA">{{cite journal \|last1=Kayal, J., Arefiev, S., Baruah, S., Tatevossian, R., Gogoi, N., Sanoujam, M., Gautam, J.L., Hazarika, D., & Borah, D. \|title=The 2009 Bhutan and Assam felt earthquakes (Mw 6.3 and 5.1) at the Kopili fault in the northeast Himalaya region \|journal=Geomatics, Natural Hazards and Risk \|date=2010 \|volume=1 \|issue=3 \|pages=273-281 \|doi=10.1080/19475705.2010.486561\|doi-access=free }}</ref> Its predominant slip sense is right-lateral strike-slip.<ref>{{cite web \|last1=Kharita \|first1=Akash \|title=Strong earthquake jolts Assam \|url=https://temblor.net/earthquake-insights/strong-earthquake-jolts-assam-12692/ \|website=Temblor \|access-date=15 May 2021 \|doi=10.32858/temblor.171}}</ref>

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	== Impact ==		== Impact ==
	The earthquake caused moderate but widespread damage to nearby buildings, but no collapses were reported.<ref>{{Cite web\|date=2021-04-28\|title=Quake of magnitude 6 strikes India's Assam, damages some buildings\|url=https://www.reuters.com/world/india/magnitude-62-earthquake-strikes-assam-india-emsc-2021-04-28/\|access-date=2021-04-28\|website=Reuters}}</ref> Among the buildings affected was a multi-story structure in Nagaon which tilted to its side and leaned against an adjacent building. Cracks also appeared in the walls of homes and commercial buildings. A few vehicles were damaged when bricks fell on them.<ref>{{cite news \|title=From damage caused to relief operations, Assam earthquake explained in 10 points \|url=https://www.indiatoday.in/coronavirus-outbreak/story/damage-caused-relief-operations-assam-earthquake-1796077-2021-04-29 \|access-date=15 May 2021 \|agency=India Today \|date=29 April 2021 \|location=New Delhi}}</ref> Landslides and liquefaction of the ground were reported in Assam.<ref>{{cite news \|title=Cracked roads, tilted buildings: Assam earthquake captured in scary photos, videos \|url=https://www.indiatoday.in/india/story/massive-earthquake-assam-buildings-damaged-walls-cracked-photos-videos-1795765-2021-04-28 \|access-date=15 May 2021 \|agency=India Today \|date=28 April 2021 \|location=New Delhi}}</ref> Damage to buildings were also reported in nearby Bhutan, and two individuals were injured.<ref>{{cite news \|title=Earthquake causes structural damage \|url=https://kuenselonline.com/earthquake-causes-structural-damage/ \|access-date=15 May 2021 \|agency=kuenselonline.com}}</ref> Two people in the Kamrup Metro and Nagaon districts died of heart attacks caused by the earthquake while ~~ten~~ others suffered injuries.<ref>{{cite news \|last1=Saha \|first1=Abhishek \|title=Assam earthquake: At least 10 injured, houses damaged \|url=https://indianexpress.com/article/north-east-india/assam/assam-bengal-earthquake-7291892/ \|access-date=15 May 2021 \|agency=The Indian Express \|date=29 April 2021 \|location=Guwahati}}</ref><ref>{{cite news \|title=Two die of shock after 6.4 magnitude quake in Assam \|url=https://www.thehindu.com/news/national/other-states/earthquake-of-magnitude-64-strikes-assam/article34427787.ece \|access-date=15 May 2021 \|agency=The Hindu \|date=28 April 2021}}</ref>		The earthquake caused moderate but widespread damage to nearby buildings, but no collapses were reported.<ref>{{Cite web\|date=2021-04-28\|title=Quake of magnitude 6 strikes India's Assam, damages some buildings\|url=https://www.reuters.com/world/india/magnitude-62-earthquake-strikes-assam-india-emsc-2021-04-28/\|access-date=2021-04-28\|website=Reuters}}</ref> Among the buildings affected was a multi-story structure in Nagaon which tilted to its side and leaned against an adjacent building. Cracks also appeared in the walls of homes and commercial buildings. A few vehicles were damaged when bricks fell on them.<ref>{{cite news \|title=From damage caused to relief operations, Assam earthquake explained in 10 points \|url=https://www.indiatoday.in/coronavirus-outbreak/story/damage-caused-relief-operations-assam-earthquake-1796077-2021-04-29 \|access-date=15 May 2021 \|agency=India Today \|date=29 April 2021 \|location=New Delhi}}</ref> Landslides and liquefaction of the ground were reported in Assam.<ref>{{cite news \|title=Cracked roads, tilted buildings: Assam earthquake captured in scary photos, videos \|url=https://www.indiatoday.in/india/story/massive-earthquake-assam-buildings-damaged-walls-cracked-photos-videos-1795765-2021-04-28 \|access-date=15 May 2021 \|agency=India Today \|date=28 April 2021 \|location=New Delhi}}</ref> Damage to buildings were also reported in nearby Bhutan, and two individuals were injured.<ref>{{cite news \|title=Earthquake causes structural damage \|url=https://kuenselonline.com/earthquake-causes-structural-damage/ \|access-date=15 May 2021 \|agency=kuenselonline.com}}</ref> Two people in the Kamrup Metro and Nagaon districts died of heart attacks caused by the earthquake while 12 others suffered injuries.<ref>{{cite news \|last1=Saha \|first1=Abhishek \|title=Assam earthquake: At least 10 injured, houses damaged \|url=https://indianexpress.com/article/north-east-india/assam/assam-bengal-earthquake-7291892/ \|access-date=15 May 2021 \|agency=The Indian Express \|date=29 April 2021 \|location=Guwahati}}</ref><ref>{{cite news \|title=Two die of shock after 6.4 magnitude quake in Assam \|url=https://www.thehindu.com/news/national/other-states/earthquake-of-magnitude-64-strikes-assam/article34427787.ece \|access-date=15 May 2021 \|agency=The Hindu \|date=28 April 2021}}</ref>

	==See also==		==See also==
			{{Portal\|India\|Earth sciences}}
	*[[List of earthquakes in 2021]]		*[[List of earthquakes in 2021]]
	*[[List of earthquakes in India]]		*[[List of earthquakes in India]]
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	{{Earthquakes in India}}		{{Earthquakes in India}}
	{{Himalayan earthquakes}}		{{Himalayan earthquakes}}

	~~{{coord missing\|Assam}}~~

	[[Category:2021 earthquakes]]		[[Category:2021 earthquakes]]
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	[[Category:Earthquakes in Bhutan]]		[[Category:Earthquakes in Bhutan]]
	[[Category:2021 disasters in India]]		[[Category:2021 disasters in India]]
			[[Category:2021 earthquakes in Asia]]

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	A [[Magnitude (earthquake)\|magnitude]] of 6.0 ~~earthquake~~ struck 11 km (7 miles) away from [[Assam\|Dhekiajuli, Assam, India]] at 07:51 [[Time in India\|(IST)]] on April 28, 2021.<ref>{{Cite web\|date=2021-04-28\|title=Northeast India hit by magnitude 6.4 earthquake\|url=https://www.independent.co.uk/asia/india/india-earthquake-today-assam-latest-b1838656.html\|access-date=2021-04-28\|website=The Independent\|language=en}}</ref> The quake struck at a depth of 34 km (21 miles), 140 km (86 miles) north of the main city of [[Guwahati]].		An earthquake of [[Magnitude (earthquake)\|magnitude]] 6.0 struck 11 km (7 miles) away from [[Assam\|Dhekiajuli, Assam, India]] at 07:51 [[Time in India\|(IST)]] on April 28, 2021.<ref>{{Cite web\|date=2021-04-28\|title=Northeast India hit by magnitude 6.4 earthquake\|url=https://www.independent.co.uk/asia/india/india-earthquake-today-assam-latest-b1838656.html\|access-date=2021-04-28\|website=The Independent\|language=en}}</ref> The quake struck at a depth of 34 km (21 miles), 140 km (86 miles) north of the main city of [[Guwahati]]. It resulted in two fatalities and at least 12 injuries.

	==Tectonic setting==		==Tectonic setting==
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	The earthquake occurred as a result of oblique-slip faulting at a shallow depth just at the foothills of the Himalayas.<ref>{{cite web \|title=Assam Earthquake: 6.4 magnitude quake, 7 aftershocks jolt Northeast, tremors felt in Bengal \|url=https://www.indiatoday.in/india/story/earthquake-in-northeast-tremors-felt-in-assam-north-bengal-arunachal-pradesh-1795696-2021-04-28 \|publisher=[[India Today]] \|access-date=28 April 2021}}</ref><ref>{{Cite web\|title=Official Website of National Center of Seismology\|url=https://seismo.gov.in/MIS/riseq/interactive/index/ZVNoMWsrTTlhMEZUUXN1UEgxbUcxUT09/Reviewed\|access-date=2021-05-03\|website=seismo.gov.in}}</ref> Analysis by India's [[National Centre for Seismology]] revealed that the earthquake involved slip along the Kopili Fault, near the [[Main Frontal Thrust]].<ref name="BB">{{cite news \|last1=Chakravartty \|first1=Anupam \|title=Assam earthquake: Known to cause deadly tremors, Kopili fault eludes experts \|url=https://www.eastmojo.com/assam/2021/04/29/assam-earthquake-known-to-cause-deadly-tremors-kopili-fault-eludes-experts/ \|access-date=15 May 2021 \|agency=EastMojo \|date=29 April 2021}}</ref> This is a northeast striking fault structure that runs from east of the Shillong Plateau, through the Assam Valley and into Bhutan for a total estimated length of 300 km, and a width of 30 km.<ref name="AA">{{cite journal \|last1=Kayal, J., Arefiev, S., Baruah, S., Tatevossian, R., Gogoi, N., Sanoujam, M., Gautam, J.L., Hazarika, D., & Borah, D. \|title=The 2009 Bhutan and Assam felt earthquakes (Mw 6.3 and 5.1) at the Kopili fault in the northeast Himalaya region \|journal=Geomatics, Natural Hazards and Risk \|date=2010 \|volume=1 \|issue=3 \|pages=273-281 \|doi=10.1080/19475705.2010.486561\|doi-access=free }}</ref> Its predominant slip sense is right-lateral strike-slip.<ref>{{cite web \|last1=Kharita \|first1=Akash \|title=Strong earthquake jolts Assam \|url=https://temblor.net/earthquake-insights/strong-earthquake-jolts-assam-12692/ \|website=Temblor \|access-date=15 May 2021 \|doi=10.32858/temblor.171}}</ref>		The earthquake occurred as a result of oblique-slip faulting at a shallow depth just at the foothills of the Himalayas.<ref>{{cite web \|title=Assam Earthquake: 6.4 magnitude quake, 7 aftershocks jolt Northeast, tremors felt in Bengal \|url=https://www.indiatoday.in/india/story/earthquake-in-northeast-tremors-felt-in-assam-north-bengal-arunachal-pradesh-1795696-2021-04-28 \|publisher=[[India Today]] \|access-date=28 April 2021}}</ref><ref>{{Cite web\|title=Official Website of National Center of Seismology\|url=https://seismo.gov.in/MIS/riseq/interactive/index/ZVNoMWsrTTlhMEZUUXN1UEgxbUcxUT09/Reviewed\|access-date=2021-05-03\|website=seismo.gov.in}}</ref> Analysis by India's [[National Centre for Seismology]] revealed that the earthquake involved slip along the Kopili Fault, near the [[Main Frontal Thrust]].<ref name="BB">{{cite news \|last1=Chakravartty \|first1=Anupam \|title=Assam earthquake: Known to cause deadly tremors, Kopili fault eludes experts \|url=https://www.eastmojo.com/assam/2021/04/29/assam-earthquake-known-to-cause-deadly-tremors-kopili-fault-eludes-experts/ \|access-date=15 May 2021 \|agency=EastMojo \|date=29 April 2021}}</ref> This is a northeast striking fault structure that runs from east of the Shillong Plateau, through the Assam Valley and into Bhutan for a total estimated length of 300 km, and a width of 30 km.<ref name="AA">{{cite journal \|last1=Kayal, J., Arefiev, S., Baruah, S., Tatevossian, R., Gogoi, N., Sanoujam, M., Gautam, J.L., Hazarika, D., & Borah, D. \|title=The 2009 Bhutan and Assam felt earthquakes (Mw 6.3 and 5.1) at the Kopili fault in the northeast Himalaya region \|journal=Geomatics, Natural Hazards and Risk \|date=2010 \|volume=1 \|issue=3 \|pages=273-281 \|doi=10.1080/19475705.2010.486561\|doi-access=free }}</ref> Its predominant slip sense is right-lateral strike-slip.<ref>{{cite web \|last1=Kharita \|first1=Akash \|title=Strong earthquake jolts Assam \|url=https://temblor.net/earthquake-insights/strong-earthquake-jolts-assam-12692/ \|website=Temblor \|access-date=15 May 2021 \|doi=10.32858/temblor.171}}</ref>

	The same fault is believed to have caused the an {{M\|wb}} 6.1 [[2009 Bhutan earthquake\|earthquake in Bhutan]] in 2009, killing 11 and injuring dozens.<ref>{{cite web \|title=M 6.1 - Bhutan \|url=https://earthquake.usgs.gov/earthquakes/eventpage/usp000h1r4/executive \|website=earthquake.usgs.gov \|publisher=USGS \|access-date=15 May 2021}}</ref> Two other {{M\|w}} 7.0+ earthquakes rocked the Assam Valley in [[1869 Cachar earthquake\|1869]] and 1943, is believed to have been on this fault, as well as the ~~deadliest earthquake of all times~~ [[2016 Imphal earthquake]].<ref name="AA" />		The same fault is believed to have caused the an {{M\|wb}} 6.1 [[2009 Bhutan earthquake\|earthquake in Bhutan]] in 2009, killing 11 and injuring dozens.<ref>{{cite web \|title=M 6.1 - Bhutan \|url=https://earthquake.usgs.gov/earthquakes/eventpage/usp000h1r4/executive \|website=earthquake.usgs.gov \|publisher=USGS \|access-date=15 May 2021}}</ref> Two other {{M\|w}} 7.0+ earthquakes rocked the Assam Valley in [[1869 Cachar earthquake\|1869]] and 1943, is believed to have been on this fault, as well as the deadly [[2016 Imphal earthquake]].<ref name="AA" />

	== Impact ==		== Impact ==
	The earthquake caused moderate but widespread damage to nearby ~~building~~ but no collapses were reported.<ref>{{Cite web\|date=2021-04-28\|title=Quake of magnitude 6 strikes India's Assam, damages some buildings\|url=https://www.reuters.com/world/india/magnitude-62-earthquake-strikes-assam-india-emsc-2021-04-28/\|access-date=2021-04-28\|website=Reuters}}</ref> Among the buildings affected was an multi-story structure in Nagaon which tilted to its side and leaned against an adjacent building. Cracks also appeared in the walls of homes and commercial buildings. A few vehicles were damaged when bricks fell on them.<ref>{{cite news \|title=From damage caused to relief operations, Assam earthquake explained in 10 points \|url=https://www.indiatoday.in/coronavirus-outbreak/story/damage-caused-relief-operations-assam-earthquake-1796077-2021-04-29 \|access-date=15 May 2021 \|agency=India Today \|date=29 April 2021 \|location=New Delhi}}</ref> Landslides and liquefaction of the ground were reported in Assam.<ref>{{cite news \|title=Cracked roads, tilted buildings: Assam earthquake captured in scary photos, videos \|url=https://www.indiatoday.in/india/story/massive-earthquake-assam-buildings-damaged-walls-cracked-photos-videos-1795765-2021-04-28 \|access-date=15 May 2021 \|agency=India Today \|date=28 April 2021 \|location=New Delhi}}</ref> Damage to buildings were also reported in nearby Bhutan, and two individuals were injured.<ref>{{cite news \|title=Earthquake causes structural damage \|url=https://kuenselonline.com/earthquake-causes-structural-damage/ \|access-date=15 May 2021 \|agency=kuenselonline.com}}</ref> Two people in the Kamrup Metro and Nagaon districts died of heart attacks caused by the earthquake while ten others suffered injuries.<ref>{{cite news \|last1=Saha \|first1=Abhishek \|title=Assam earthquake: At least 10 injured, houses damaged \|url=https://indianexpress.com/article/north-east-india/assam/assam-bengal-earthquake-7291892/ \|access-date=15 May 2021 \|agency=The Indian Express \|date=29 April 2021 \|location=Guwahati}}</ref><ref>{{cite news \|title=Two die of shock after 6.4 magnitude quake in Assam \|url=https://www.thehindu.com/news/national/other-states/earthquake-of-magnitude-64-strikes-assam/article34427787.ece \|access-date=15 May 2021 \|agency=The Hindu \|date=28 April 2021}}</ref>		The earthquake caused moderate but widespread damage to nearby buildings, but no collapses were reported.<ref>{{Cite web\|date=2021-04-28\|title=Quake of magnitude 6 strikes India's Assam, damages some buildings\|url=https://www.reuters.com/world/india/magnitude-62-earthquake-strikes-assam-india-emsc-2021-04-28/\|access-date=2021-04-28\|website=Reuters}}</ref> Among the buildings affected was a multi-story structure in Nagaon which tilted to its side and leaned against an adjacent building. Cracks also appeared in the walls of homes and commercial buildings. A few vehicles were damaged when bricks fell on them.<ref>{{cite news \|title=From damage caused to relief operations, Assam earthquake explained in 10 points \|url=https://www.indiatoday.in/coronavirus-outbreak/story/damage-caused-relief-operations-assam-earthquake-1796077-2021-04-29 \|access-date=15 May 2021 \|agency=India Today \|date=29 April 2021 \|location=New Delhi}}</ref> Landslides and liquefaction of the ground were reported in Assam.<ref>{{cite news \|title=Cracked roads, tilted buildings: Assam earthquake captured in scary photos, videos \|url=https://www.indiatoday.in/india/story/massive-earthquake-assam-buildings-damaged-walls-cracked-photos-videos-1795765-2021-04-28 \|access-date=15 May 2021 \|agency=India Today \|date=28 April 2021 \|location=New Delhi}}</ref> Damage to buildings were also reported in nearby Bhutan, and two individuals were injured.<ref>{{cite news \|title=Earthquake causes structural damage \|url=https://kuenselonline.com/earthquake-causes-structural-damage/ \|access-date=15 May 2021 \|agency=kuenselonline.com}}</ref> Two people in the Kamrup Metro and Nagaon districts died of heart attacks caused by the earthquake while ten others suffered injuries.<ref>{{cite news \|last1=Saha \|first1=Abhishek \|title=Assam earthquake: At least 10 injured, houses damaged \|url=https://indianexpress.com/article/north-east-india/assam/assam-bengal-earthquake-7291892/ \|access-date=15 May 2021 \|agency=The Indian Express \|date=29 April 2021 \|location=Guwahati}}</ref><ref>{{cite news \|title=Two die of shock after 6.4 magnitude quake in Assam \|url=https://www.thehindu.com/news/national/other-states/earthquake-of-magnitude-64-strikes-assam/article34427787.ece \|access-date=15 May 2021 \|agency=The Hindu \|date=28 April 2021}}</ref>

	==See also==		==See also==
Line 46:		Line 46:
	{{Himalayan earthquakes}}		{{Himalayan earthquakes}}

	{{coord missing}}		{{coord missing\|Assam}}

	[[Category:2021 earthquakes]]		[[Category:2021 earthquakes]]

2409:4056:E97:94D2:C530:8391:740E:D303: /* Earthquake */

2021-05-26T09:58:26Z

Earthquake

New page

{{Infobox earthquake
| isc-event = 620343980
| magnitude = {{M|w|link=y}} 6.0<ref name="USGS">{{cite web |title=M 6.0 - 9 km NNW of Dhekiajuli, India |url=https://earthquake.usgs.gov/earthquakes/eventpage/us7000dy3b/executive |website=earthquake.usgs.gov |publisher=USGS |access-date=14 May 2021}}</ref><br> 6.4 <ref>{{cite web |title=Strong earthquake of 6.4 magnitude hits Assam |url=https://www.businesstoday.in/latest/trends/breaking-earthquake-of-64-magnitude-hits-assam/story/437724.html |publisher=[[Business Today (India)]] |access-date=28 April 2021}}</ref>
| local-time = 07:51 [[Time in India|(IST)]]
| location = 26.77 N ; 92.43 E
| anss-url = https://earthquake.usgs.gov/earthquakes/eventpage/us7000dy3b/
| name = 2021 Assam earthquake
| timestamp = 2021-04-28 02:21:26
| map = {{Location map+|India|width=250|float=none|border=none|relief=yes|caption=|places=
{{Location map~|India|lat=26.77|long=92.43|mark=Bullseye1.png|marksize=40|position=top|label=}}
}}
| alt =
| depth = 34 km (21 miles)
| intensity = {{MMI|VII}}
| image =
| local-date = 2021-04-28
| aftershocks = Six. The strongest so far is an {{M|w}} 4.7 <ref>{{cite web |title=Explained: In Assam earthquake, reminder of seismic hazard along HFT faultline|url=https://indianexpress.com/article/explained/explained-in-assam-earthquake-reminder-of-seismic-hazard-along-hft-faultline-7292770/ |publisher=The Indian Express |access-date=28 April 2021}}</ref>
| fault = Kopili Fault
| casualties = 2 dead, 12 injured
| countries affected = [[Bangladesh]], [[China]], [[Myanmar]], [[Bhutan]], and [[India]]
}}

A [[Magnitude (earthquake)|magnitude]] of 6.0 earthquake struck 11 km (7 miles) away from [[Assam|Dhekiajuli, Assam, India]] at 07:51 [[Time in India|(IST)]] on April 28, 2021.<ref>{{Cite web|date=2021-04-28|title=Northeast India hit by magnitude 6.4 earthquake|url=https://www.independent.co.uk/asia/india/india-earthquake-today-assam-latest-b1838656.html|access-date=2021-04-28|website=The Independent|language=en}}</ref> The quake struck at a depth of 34 km (21 miles), 140 km (86 miles) north of the main city of [[Guwahati]].

==Tectonic setting==
The tectonics of the Assam region is dominated by convergence of the India, Burma and Eurasian plates. Major fault structures like the [[Main Frontal Thrust]], Main Boundary Thrust and [[Main Central Thrust]], all splay branches of the [[Main Himalayan Thrust]], accommodate the shortening rate as India is pushing into Asia. The large 8.6 {{M|w}} [[1950 Assam-Tibet earthquake|Assam-Tibet earthquake]] in 1950 was a megathrust earthquake that resulted from a rupture along the Main Himalayan Thrust and Main Frontal Thrust.

== Earthquake ==
[[File:2021-04-28 Dhekiajuli, India M6 earthquake intensity map (USGS).jpg|right|thumb|Earthquake Intensity Map]]
The earthquake occurred as a result of oblique-slip faulting at a shallow depth just at the foothills of the Himalayas.<ref>{{cite web |title=Assam Earthquake: 6.4 magnitude quake, 7 aftershocks jolt Northeast, tremors felt in Bengal |url=https://www.indiatoday.in/india/story/earthquake-in-northeast-tremors-felt-in-assam-north-bengal-arunachal-pradesh-1795696-2021-04-28 |publisher=[[India Today]] |access-date=28 April 2021}}</ref><ref>{{Cite web|title=Official Website of National Center of Seismology|url=https://seismo.gov.in/MIS/riseq/interactive/index/ZVNoMWsrTTlhMEZUUXN1UEgxbUcxUT09/Reviewed|access-date=2021-05-03|website=seismo.gov.in}}</ref> Analysis by India's [[National Centre for Seismology]] revealed that the earthquake involved slip along the Kopili Fault, near the [[Main Frontal Thrust]].<ref name="BB">{{cite news |last1=Chakravartty |first1=Anupam |title=Assam earthquake: Known to cause deadly tremors, Kopili fault eludes experts |url=https://www.eastmojo.com/assam/2021/04/29/assam-earthquake-known-to-cause-deadly-tremors-kopili-fault-eludes-experts/ |access-date=15 May 2021 |agency=EastMojo |date=29 April 2021}}</ref> This is a northeast striking fault structure that runs from east of the Shillong Plateau, through the Assam Valley and into Bhutan for a total estimated length of 300 km, and a width of 30 km.<ref name="AA">{{cite journal |last1=Kayal, J., Arefiev, S., Baruah, S., Tatevossian, R., Gogoi, N., Sanoujam, M., Gautam, J.L., Hazarika, D., & Borah, D. |title=The 2009 Bhutan and Assam felt earthquakes (Mw 6.3 and 5.1) at the Kopili fault in the northeast Himalaya region |journal=Geomatics, Natural Hazards and Risk |date=2010 |volume=1 |issue=3 |pages=273-281 |doi=10.1080/19475705.2010.486561|doi-access=free }}</ref> Its predominant slip sense is right-lateral strike-slip.<ref>{{cite web |last1=Kharita |first1=Akash |title=Strong earthquake jolts Assam |url=https://temblor.net/earthquake-insights/strong-earthquake-jolts-assam-12692/ |website=Temblor |access-date=15 May 2021 |doi=10.32858/temblor.171}}</ref>

The same fault is believed to have caused the an {{M|wb}} 6.1 [[2009 Bhutan earthquake|earthquake in Bhutan]] in 2009, killing 11 and injuring dozens.<ref>{{cite web |title=M 6.1 - Bhutan |url=https://earthquake.usgs.gov/earthquakes/eventpage/usp000h1r4/executive |website=earthquake.usgs.gov |publisher=USGS |access-date=15 May 2021}}</ref> Two other {{M|w}} 7.0+ earthquakes rocked the Assam Valley in [[1869 Cachar earthquake|1869]] and 1943, is believed to have been on this fault, as well as the deadliest earthquake of all times [[2016 Imphal earthquake]].<ref name="AA" />

== Impact ==
The earthquake caused moderate but widespread damage to nearby building but no collapses were reported.<ref>{{Cite web|date=2021-04-28|title=Quake of magnitude 6 strikes India's Assam, damages some buildings|url=https://www.reuters.com/world/india/magnitude-62-earthquake-strikes-assam-india-emsc-2021-04-28/|access-date=2021-04-28|website=Reuters}}</ref> Among the buildings affected was an multi-story structure in Nagaon which tilted to its side and leaned against an adjacent building. Cracks also appeared in the walls of homes and commercial buildings. A few vehicles were damaged when bricks fell on them.<ref>{{cite news |title=From damage caused to relief operations, Assam earthquake explained in 10 points |url=https://www.indiatoday.in/coronavirus-outbreak/story/damage-caused-relief-operations-assam-earthquake-1796077-2021-04-29 |access-date=15 May 2021 |agency=India Today |date=29 April 2021 |location=New Delhi}}</ref> Landslides and liquefaction of the ground were reported in Assam.<ref>{{cite news |title=Cracked roads, tilted buildings: Assam earthquake captured in scary photos, videos |url=https://www.indiatoday.in/india/story/massive-earthquake-assam-buildings-damaged-walls-cracked-photos-videos-1795765-2021-04-28 |access-date=15 May 2021 |agency=India Today |date=28 April 2021 |location=New Delhi}}</ref> Damage to buildings were also reported in nearby Bhutan, and two individuals were injured.<ref>{{cite news |title=Earthquake causes structural damage |url=https://kuenselonline.com/earthquake-causes-structural-damage/ |access-date=15 May 2021 |agency=kuenselonline.com}}</ref> Two people in the Kamrup Metro and Nagaon districts died of heart attacks caused by the earthquake while ten others suffered injuries.<ref>{{cite news |last1=Saha |first1=Abhishek |title=Assam earthquake: At least 10 injured, houses damaged |url=https://indianexpress.com/article/north-east-india/assam/assam-bengal-earthquake-7291892/ |access-date=15 May 2021 |agency=The Indian Express |date=29 April 2021 |location=Guwahati}}</ref><ref>{{cite news |title=Two die of shock after 6.4 magnitude quake in Assam |url=https://www.thehindu.com/news/national/other-states/earthquake-of-magnitude-64-strikes-assam/article34427787.ece |access-date=15 May 2021 |agency=The Hindu |date=28 April 2021}}</ref>

==See also==
*[[List of earthquakes in 2021]]
*[[List of earthquakes in India]]

== References ==
{{reflist}}

{{Earthquakes in 2021}}
{{Earthquakes in India}}
{{Himalayan earthquakes}}

{{coord missing}}

[[Category:2021 earthquakes]]
[[Category:Earthquakes in India]]
[[Category:Earthquakes in Assam]]
[[Category:Earthquakes in Bhutan]]
[[Category:2021 disasters in India]]