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Light mag. 2.9 earthquake - 22 mi east of Port Heiden, Lake and Peninsula, Alaska, USA, on Saturday, Mar 18, 2023 at 12:08 am (GMT -8) -

Light magnitude 2.9 earthquake at 0 km depth

18 Mar 08:11 UTC: First to report: USGS after 3 minutes.

Earthquake details

Date & time	Mar 18, 2023 08:08:14 UTC -
Local time at epicenter	Saturday, Mar 18, 2023 at 12:08 am (GMT -8)
Status	Confirmed
Magnitude	2.9
Depth	0.0 km
Epicenter latitude / longitude	56.9057°N / 158.049°W (Lake and Peninsula, Alaska, United States)
Antipode	56.906°S / 21.951°E
Shaking intensity	Light shaking near epicenter
Felt	0 reports
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Aniakchak (8 km / 5 mi)
Nearby towns and cities	35 km (22 mi) E of Port Heiden (pop: 98) \| Show on map \| Quakes nearby 73 km (45 mi) NNE of Chignik Lagoon (pop: 78) \| Show on map \| Quakes nearby 78 km (49 mi) SSW of Ugashik (pop: 12) \| Show on map \| Quakes nearby 84 km (53 mi) NNE of Chignik Lake (pop: 73) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake	Light Snow -5.8°C (22 F), humidity: 92%, wind: 2 m/s (4 kts) from SW
Estimated seismic energy released	1.4 x 10⁹ joules (392 kilowatt hours, equivalent to 0.338 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
2.9	0 km	35 Km E of Port Heiden, Alaska	USGS
2.9	0 km	Alaska Peninsula	RaspberryShake
2.9	10 km	Alaska Peninsula	IRIS

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

Seismograms

Seismic station: Aniakchak Peak, Alaska (ANPK/AV network) | Distance from quake: 9 km / 5 mi | Show on map | Station Info

Seismic station Aniakchak Peak, 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: 0.5-10.0 Hz. Source: IRIS Buffer of Uniform Data (BUD) webtool

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Seismic station Aniakchak Peak, Alaska: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Aniakchak Peak, Alaska: 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: Black Peak Purple Crater, Alaska (BPPC/AV network) | Distance from quake: 59 km / 37 mi | Show on map | Station Info

Seismic station Black Peak Purple Crater, Alaska: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Black Peak Purple Crater, Alaska: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Black Peak Purple Crater, Alaska: 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: Black Lake, Veniaminof, Alaska (VNBL/AV network) | Distance from quake: 97 km / 61 mi | Show on map | Station Info

Seismic station Black Lake, Veniaminof, Alaska: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Black Lake, Veniaminof, Alaska: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Black Lake, Veniaminof, Alaska: 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: Angle Creek, Katmai Volcanic Cluster, Alaska (ANCK/AV network) | Distance from quake: 209 km / 130 mi | Show on map | Station Info

Seismic station Angle Creek, Katmai Volcanic Cluster, Alaska: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Angle Creek, Katmai Volcanic Cluster, Alaska: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Angle Creek, Katmai Volcanic Cluster, Alaska: 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: Dutton Volcano, Alaska (DTN/AV network) | Distance from quake: 327 km / 203 mi | Show on map | Station Info

Seismic station Dutton Volcano, Alaska: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Dutton Volcano, Alaska: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Dutton Volcano, Alaska: 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

At magnitude 2.9, this quake might have been felt very close to the epicenter and under calm conditions.

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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