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Moderate mag. 4.2 earthquake - Bering Sea, 49 mi southwest of Attu Station, Aleutians West, Alaska, USA, on Saturday, Mar 18, 2023 at 8:04 am (GMT -9) -

Moderate magnitude 4.2 earthquake at 10 km depth

18 Mar 19:00 UTC: First to report: USGS after 1 hour and 55 minutes.

Earthquake details

Date & time	Mar 18, 2023 17:04:54 UTC -
Local time at epicenter	Saturday, Mar 18, 2023 at 8:04 am (GMT -9)
Status	Confirmed
Magnitude	4.2
Depth	10.0 km
Epicenter latitude / longitude	52.2135°N / 172.6814°E (Bering Sea, Alaska, United States)
Antipode	52.214°S / 7.319°W
Shaking intensity	Light shaking near epicenter
Felt	0 reports
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Buldir (220 km / 137 mi)
Nearby towns and cities	78 km (49 mi) SSW of Attu Station (pop: 21) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake
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	78 Km SSW of Attu Station, Alaska	USGS
4.2	10 km	Near Islands, Aleutian Islands	RaspberryShake
4.2	10 km	Near Islands, Aleutian Islands	IRIS
4.2	10 km	NEAR ISLANDS, ALEUTIAN ISLANDS	EMSC

Most recent quakes Top 20 past 24 hrs Quakes in the US Alaska

Seismograms

Seismic station: Shemya Island, Alaska, USA (SHEM/IM network) | Distance from quake: 112 km / 70 mi | Show on map | Station Info

Seismic station Shemya Island, Alaska, USA: 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

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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