Very Strong Mag. 6.1 Earthquake - Andaman Sea, India, on Tuesday, Aug 3, 2021 09:12 am (GMT +5:30)

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Very strong mag. 6.1 earthquake - Nicobar Islands, India Region, on 2021-08-03 09:12:12 IST

Very strong mag. 6.1 Earthquake - Andaman Sea, India, on Tuesday, Aug 3, 2021 09:12 am (GMT +5:30)

Very strong magnitude 6.1 earthquake at 10 km depth

3 Aug 03:51 UTC: First to report: GFZ after 9 minutes.
3 Aug 03:53: Epicenter location corrected by 4.4 km (2.8 mi) towards N.
3 Aug 03:59: Now using data updates from NCS

Earthquake details

Date & time	Aug 3, 2021 03:42:12 UTC
Local time at epicenter	Tuesday, Aug 3, 2021 09:12 am (GMT +5:30)
Status	Confirmed
Magnitude	6.1
Depth	10.0 km
Epicenter latitude / longitude	9.05°N / 93.91°E Andaman Sea, India
Antipode	9.05°S / 86.09°W
Shaking intensity	Strong shaking near epicenter
Felt	2 reports
Primary data source	NCS (National Center for Seismology)
Nearest volcano	###NEARESTVOLCANO2###
Weather at epicenter at time of quake	Overcast Clouds 28.3°C (83 F), humidity: 80%, wind: 10 m/s (19 kts) from WSW
Estimated seismic energy released	8.9 x 10¹³ joules (24.8 gigawatt hours, equivalent to 21301 tons of TNT or 1.3 atomic bombs!) \| about seismic energy

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Nearby places

Distance	Place	Max. shaking intensity(*)	Region	Country
318 km (197 mi) NNW of epicenter	Port Blair (pop: 112,100)	III Weak	South Andamans, Andaman and Nicobar	India
384 km (239 mi) SSE of epicenter	Kuta Sabang (pop: 42,100)	III Weak	Kota Sabang, Aceh	Indonesia
421 km (261 mi) SSE of epicenter	Banda Aceh (pop: 255,000)	III Weak	Aceh	Indonesia

Notes:
(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.

Compare Quake Data

Data for the same earthquake as reported by different agencies

The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.

Mag	Depth	Time GMT	Epicenter	Agency
6.1	10 km (6.2 mi) (*)	2021-08-3 03:42:12	Nicobar Islands, India Region	NCS (National Center for Seismology)
6.1	10 km (6.2 mi) (*)	2021-08-3 03:42:35	NICOBAR ISLANDS, INDIA REGION 17 km (10.7 mi) epicenter difference with NCS	EMSC (European-Mediterranean Seismological Centre)
5.9	10 km (6.2 mi) (*)	2021-08-3 03:42:15	Nicobar Islands, India Region 74 km (46 mi) epicenter difference with NCS	BMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)
5.4	10 km (6.2 mi) (*)	2021-08-3 03:42:11	India: Near Banda Aceh 6.9 km (4.3 mi) epicenter difference with NCS	RENASS (Réseau National de Surveillance Sismique (RéNaSS))
6.0	10 km (6.2 mi) (*)	2021-08-3 03:42:41	India: Nicobar Islands 20 km (13 mi) epicenter difference with NCS	GFZ (German Research Centre for Geosciences)
6.1	10 km (6.2 mi) (*)	2021-08-3 03:42:38	Nicobar Islands, India Region 23 km (14 mi) epicenter difference with NCS	USGS (United States Geological Survey)
6.0	71 km (44 mi)	2021-08-3 03:42:15	India [Sea] 39 km (25 mi) epicenter difference with NCS	INGV (Istituto Nazionale di Geofisica e Vulcanologia)
5.6	21 km (13 mi)	2021-08-3 03:42:10	Nicobar Islands, India Region 49 km (31 mi) epicenter difference with NCS	TMD (Earthquake Observation Division of Thailand)
6.1	19 km (12 mi)	2021-08-3 03:42:40	Nicobar Islands, India Region 17 km (10.4 mi) epicenter difference with NCS	GeoAu (Geoscience Australia )

Notes:
(*) A depth given as 10 km often means that the the depth of the quake could not determined with sufficient accuracy.

Most recent quakes Top 20 past 24 hrs Quakes in Indonesia

Seismograms

Seismic station: Chiang Mai, Thailand (CHTO/IU network) | Distance from quake: 1214 km / 754 mi | Show on map | Station Info

Seismic station Chiang Mai, Thailand: vertical movement plot around time of quake (source: IRIS/BUD)

Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.02-5.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

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Seismic station Chiang Mai, Thailand: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Chiang Mai, Thailand: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake, showing horizontal E-W and N-S ground movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Pallekele, Sri Lanka (PALK/II network) | Distance from quake: 1467 km / 912 mi | Show on map | Station Info

Seismic station Pallekele, Sri Lanka: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Pallekele, Sri Lanka: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Pallekele, Sri Lanka: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Qiongzhong, Hainan Province, China (QIZ/IC network) | Distance from quake: 2043 km / 1270 mi | Show on map | Station Info

Seismic station Qiongzhong, Hainan Province, China: vertical movement plot around time of quake (source: IRIS/BUD)

Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.02-2.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station Qiongzhong, Hainan Province, China: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Qiongzhong, Hainan Province, China: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Po Shan, Hong Kong (HKPS/HK network) | Distance from quake: 2613 km / 1623 mi | Show on map | Station Info

Seismic station Po Shan, Hong Kong: vertical movement plot around time of quake (source: IRIS/BUD)

Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.02-2.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station Po Shan, Hong Kong: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Po Shan, Hong Kong: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Kappang, Sulawesi, Indonesia (KAPI/II network) | Distance from quake: 3263 km / 2028 mi | Show on map | Station Info

Seismic station Kappang, Sulawesi, Indonesia: vertical movement plot around time of quake (source: IRIS/BUD)

Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Bandpass filter applied: 0.02-2.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station Kappang, Sulawesi, Indonesia: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Kappang, Sulawesi, Indonesia: horizontal (N-S) movement plot around time of quake (source: IRIS/BUD)

Seismograms around time of quake.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

User-reports for this quake (7)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.

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near Mayāng Imphāl, Imphal East, Manipur (1741.4 km N of epicenter) [Map] / not felt : I don't feel (reported through our app)

Myeik, Tanintharyi (640.7 km NE of epicenter) [Map] / not felt (reported through our app)

Kolkata / Weak shaking (MMI III) / several minutes

Aurangabad (2338.1 km WNW of epicenter) [Map] / not felt (reported through our app)

Muralikrishnan tamilnadu india (1795.7 km W of epicenter) [Map] / not felt : No feel (reported through our app)

Galgamuwa (1492.7 km W of epicenter) [Map] / not felt

Yangon / Very weak shaking (MMI II) / single vertical bump / 1-2 s

Aftershocks

[More info]

Recorded aftershocks, latest first (12 quakes)

Date and Time GMT	Mag Depth	Region	Details
Dec 28, 2021 07:06 1 year 48 weeks ago	4.6 10 km	Andaman Sea, India	More
Oct 27, 2021 08:41 2 years ago - felt	4.4 153 km	Andaman Sea, India	More
Oct 24, 2021 09:47 2 years ago	4.7 10 km	Andaman Sea, 280 km SE of Port Blair, South Andamans, Andaman and Nicobar, India	More
Sep 24, 2021 15:04 2 years ago	5.2 63 km	Andaman Sea, India	More
Sep 4, 2021 18:27 2 years ago	4.3 10 km	Andaman Sea, India	More
Aug 7, 2021 21:17 2 years ago	3.8 10 km	Andaman Sea, India	More
Aug 6, 2021 08:19 2 years ago	4.6 150 km	Andaman Sea, India	More
Aug 5, 2021 12:46 2 years ago - felt	5.0 100 km	Andaman Sea, India	More
Aug 4, 2021 17:57 2 years ago	5.6 13 km	Andaman Sea, India	More
Aug 3, 2021 17:20 2 years ago	4.0 10 km	Andaman Sea, India	More
Aug 3, 2021 07:39 2 years ago	4.8 10 km	Andaman Sea, India	More
Aug 3, 2021 03:43 2 years ago	5.9 10 km	Andaman Sea, India	More

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