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Light mag. 4.2 earthquake - Bering Sea, 169 mi southwest of Unalaska, Aleutians West, Alaska, USA, on Thursday, Mar 16, 2023 at 6:33 pm (GMT -9) -

Light mag. 4.2 earthquake - Bering Sea, 169 mi southwest of Unalaska, Aleutians West, Alaska, USA, on Thursday, Mar 16, 2023 at 6:33 pm (GMT -9) Light mag. 4.2 earthquake - Bering Sea, 169 mi southwest of Unalaska, Aleutians West, Alaska, USA, on Thursday, Mar 16, 2023 at 6:33 pm (GMT -9)

Light magnitude 4.2 earthquake at 45 km depth

17 Mar 04:05 UTC: First to report: USGS after 32 minutes.
Update Fri, 17 Mar 2023, 04:12

Moderate magnitude 4.2 earthquake 54 miles southwest of Nikolski, Alaska, United States

4.2 quake 16 Mar 6:33 pm (GMT -9)
4.2 quake 16 Mar 6:33 pm (GMT -9)
A magnitude 4.2 earthquake near Nikolski, Aleutians West, Alaska, USA, was reported 39 minutes ago by the United States Geological Survey, considered the key international and national agency that monitors seismic activity in the US. The earthquake occurred at a moderately shallow depth of 28 miles beneath the epicenter early evening on Thursday, March 16th, 2023, at 6:33 pm local time. Magnitude and other quake parameters can still change in the coming hours as the agency continues to process seismic data.
A second report was later issued by The Incorporated Research Institutions for Seismology (IRIS), which listed it as a magnitude 4.2 earthquake as well. A third agency, the citizen-seismograph network of RaspberryShake, reported the same quake at magnitude 4.2.
Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Nikolski (pop. 18) located 54 miles from the epicenter.

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Earthquake details

Date & timeMar 17, 2023 03:33:15 UTC -
Local time at epicenterThursday, Mar 16, 2023 at 6:33 pm (GMT -9)
Depth44.8 km
Epicenter latitude / longitude52.5639°N / 169.9892°W (Bering Sea, Alaska, United States)
Antipode52.564°S / 10.011°E
Shaking intensityWeak shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoHerbert (21 km / 13 mi)
Nearby towns and cities87 km (54 mi) WSW of Nikolski (pop: 18) | Show on map | Quakes nearby
272 km (169 mi) WSW of Unalaska (pop: 4,490) | Show on map | Quakes nearby
273 km (169 mi) WSW of Dutch Harbor (pop: 4,380) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds -0.2°C (32 F), humidity: 56%, wind: 11 m/s (22 kts) from N
Estimated seismic energy released1.3 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.
4.245 km86 Km WSW of Nikolski, AlaskaUSGS
4.245 kmFox Islands, Aleutian IslandsRaspberryShake
4.210 kmFox Islands, Aleutian IslandsIRIS


Seismic station: Cone F, Okmok Caldera, Alaska (OKCF/AV network) | Distance from quake: 155 km / 96 mi | Show on map | Station Info
Seismic station Cone F, Okmok Caldera, Alaska: 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: 0.2-10.0 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.

Earlier earthquakes in the same area

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