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Strong mag. 5.6 earthquake - Andaman Sea, India, on Wednesday, Aug 4, 2021 at 11:27 pm (GMT +5:30)

This quake was likely an aftershock of the 6.1 quake Andaman Sea, India, Aug 3, 2021 9:12 am (GMT +5:30), which had occurred 1 day 14 hours earlier.
Strong mag. 5.6 earthquake - Andaman Sea, India, on Wednesday, Aug 4, 2021 at 11:27 pm (GMT +5:30) Strong mag. 5.6 earthquake - Andaman Sea, India, on Wednesday, Aug 4, 2021 at 11:27 pm (GMT +5:30)

Strong magnitude 5.6 earthquake at 13 km depth

4 Aug 18:07 UTC: First to report: GFZ after 9 minutes.
4 Aug 18:08: Epicenter location corrected by 3.1 km (1.9 mi) towards SW.
4 Aug 18:16: Now using data updates from NCS
4 Aug 19:34: Magnitude recalculated from 4.9 to 5.6. Hypocenter depth recalculated from 10.0 to 13.0 km (from 6.2 to 8.1 mi).

Earthquake details

Date & timeAug 4, 2021 17:57:50 UTC
Local time at epicenterWednesday, Aug 4, 2021 at 11:27 pm (GMT +5:30)
Depth13.0 km
Epicenter latitude / longitude8.76°N / 94.22°E (Andaman Sea, India)
Antipode8.76°S / 85.78°W
Shaking intensityStrong shaking near epicenter
Felt0 reports
Primary data sourceNCS (National Center for Seismology)
Nearby towns and cities341 km (212 mi) NNW of Sabang (Indonesia) (pop: 24,500) | Show on map | Quakes nearby
361 km (224 mi) SSE of Port Blair (pop: 112,100) | Show on map | Quakes nearby
378 km (235 mi) NNW of Banda Aceh (Indonesia) (pop: 250,800) | Show on map | Quakes nearby
422 km (262 mi) NNW of Sigli (Kabupaten Pidie, Indonesia) (pop: 17,500) | Show on map | Quakes nearby
455 km (283 mi) NNW of Reuleuet (Indonesia) (pop: 40,400) | Show on map | Quakes nearby
481 km (299 mi) NW of Bireun (Kabupaten Bireuen, Indonesia) (pop: 25,800) | Show on map | Quakes nearby
513 km (319 mi) NW of Lhokseumawe (Indonesia) (pop: 89,000) | Show on map | Quakes nearby
134 km (83 mi) ENE of Teressa Island (pop: 1,930) | Show on map | Quakes nearby
378 km (235 mi) SE of North Sentinel Island (pop: 50) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 28.4°C (83 F), humidity: 80%, wind: 11 m/s (21 kts) from WSW
Estimated seismic energy released1.6 x 1013 joules (4.4 gigawatt hours, equivalent to 3788 tons of TNT or 0.2 atomic bombs!) | about seismic energy
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Data for the same earthquake reported by different agencies

Info: 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.
5.613 kmIndia: Nicobar IslandsNCS
5.210 kmIndia: Near Banda AcehRENASS
5.210 kmNicobar Islands, India RegionTMD
5.2161 kmNicobar Islands, India RegionBMKG
5.510 kmIndia: Nicobar IslandsGFZ
5.55 kmNicobar Islands, India RegionUSGS
5.610 kmNicobar Islands, India RegionGeoAu


Seismic station: Chiang Mai, Thailand (CHTO/IU network) | Distance from quake: 1229 km / 763 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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User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.

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