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Moderate mag. 4.2 earthquake - Indian Ocean, 84 km west of Waingapu, East Nusa Tenggara, Indonesia, on Friday, Aug 6, 2021 at 12:47 pm (GMT +8)

Moderate magnitude 4.2 earthquake at 10 km depth

6 Aug 04:55 UTC: First to report: BMKG after 7 minutes.
6 Aug 05:05: Magnitude recalculated from 3.8 to 4.2. Hypocenter depth recalculated from 12.0 to 10.0 km (from 7.5 to 6.2 mi). Epicenter location corrected by 2.5 km (1.5 mi) towards SSW.

Update Fri, 6 Aug 2021, 05:09

Moderate tremor of magnitude 4.2 just reported 84 km southwest of Waingapu, Indonesia

4.2 quake 6 Aug 12:47 pm (GMT +8)

An earthquake of magnitude 4.2 occurred around noon on Friday 6 August 2021 at 12:47 pm local time near Waingapu, East Nusa Tenggara, Indonesia, as reported by Indonesia's Meteorology, Climatology, and Geophysical Agency.
According to preliminary data, the quake was located at a shallow depth of 10 km. Shallow earthquakes are felt more strongly than deeper ones as they are closer to the surface. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 3.8 earthquake.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Waingapu (pop. 48,800) located 84 km from the epicenter.

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Earthquake details

Date & time	Aug 6, 2021 04:47:58 UTC
Local time at epicenter	Friday, Aug 6, 2021 at 12:47 pm (GMT +8)
Status	Confirmed
Magnitude	4.2
Depth	10.0 km
Epicenter latitude / longitude	9.81°S / 119.51°E (Indian Ocean, Indonesia)
Antipode	9.81°N / 60.49°W
Shaking intensity	Light shaking near epicenter
Felt	0 reports
Primary data source	BMKG (Meteorological, Climatological, and Geophysical Agency of Indonesia)
Nearest volcano	Wai Sano (131 km / 81 mi)
Nearby towns and cities	84 km (52 mi) WSW of Waingapu (pop: 48,800) \| Show on map \| Quakes nearby 136 km (84 mi) S of Komodo (pop: 2,000) \| Show on map \| Quakes nearby 152 km (94 mi) SSW of Labuan Bajo (pop: 188,700) \| Show on map \| Quakes nearby 170 km (105 mi) SW of Ruteng (Kabupaten Manggarai) (pop: 34,600) \| Show on map \| Quakes nearby 173 km (108 mi) SSE of Bima (pop: 67,000) \| Show on map \| Quakes nearby 182 km (113 mi) SE of Dompu (pop: 49,000) \| Show on map \| Quakes nearby 260 km (161 mi) WSW of Ende (pop: 77,200) \| Show on map \| Quakes nearby 272 km (169 mi) SE of Pototano (Kabupaten Sumbawa) (pop: 5,000) \| Show on map \| Quakes nearby 272 km (169 mi) ESE of Sumbawa Besar (pop: 52,700) \| Show on map \| Quakes nearby 51 km (32 mi) WSW of Pulau Sumba Island (pop: 686,100) \| Show on map \| Quakes nearby 203 km (126 mi) SE of Pulau Sumbawa Island (pop: 1,391,300) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake	Broken Clouds 29.3°C (85 F), humidity: 63%, wind: 6 m/s (11 kts) from SSE
Estimated seismic energy released	1.3 x 10¹¹ joules (35 megawatt hours, equivalent to 30.1 tons of TNT) \| 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.

Mag.	Depth	Location	Source
4.2	10 km	Sumba Region, Indonesia	BMKG
3.8	12 km	SUMBA REGION, INDONESIA	EMSC

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Seismograms

Seismic station: Fitzroy Crossing (FITZ/AU network) | Distance from quake: 1134 km / 705 mi | Show on map | Station Info

Seismic station Fitzroy Crossing: 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: 0.2-5.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

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.

Earlier earthquakes in the same area

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