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Minor mag. 3.0 earthquake - 16 mi south of Skwentna, Matanuska-Susitna, Alaska, USA, on Monday, February 23, 2015 00:04:21

Minor magnitude 3.0 earthquake at 77 km depth

23 Feb 10:10 UTC: First to report: USGS after 1 hour and 6 minutes.
Hypocenter depth recalculated from 77.9 to 77.1 km.

Earthquake details

Date & time	Feb 23, 2015 09:04:21 UTC
Local time at epicenter	Monday, February 23, 2015 00:04:21
Status	Confirmed
Magnitude	3
Depth	77.1 km
Epicenter latitude / longitude	61.7582°N / 151.5155°W (Matanuska-Susitna, Alaska, United States)
Antipode	61.758°S / 28.485°E
Shaking intensity	Not felt
Felt
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Hayes (50 km / 31 mi)
Nearby towns and cities	27 km (16 mi) SSW of Skwentna (pop: 37) \| Show on map \| Quakes nearby 78 km (48 mi) W of Willow Creek (pop: 2,100) \| Show on map \| Quakes nearby 87 km (54 mi) WNW of Big Lake (pop: 3,350) \| Show on map \| Quakes nearby 91 km (56 mi) W of Houston (pop: 2,210) \| Show on map \| Quakes nearby 98 km (61 mi) WSW of Susitna North (pop: 1,260) \| Show on map \| Quakes nearby 105 km (65 mi) NW of Alaska City (pop: 298,700) \| Show on map \| Quakes nearby 105 km (65 mi) WNW of Knik-Fairview (pop: 14,900) \| Show on map \| Quakes nearby 111 km (69 mi) W of Wasilla (pop: 9,280) \| Show on map \| Quakes nearby 114 km (71 mi) WNW of Eagle River (pop: 24,800) \| Show on map \| Quakes nearby 114 km (71 mi) WNW of Eagle River (Anchorage) (pop: 24,800) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake
Estimated seismic energy released	2 x 10⁹ joules (554 kilowatt hours, equivalent to 0.477 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
3.0	77 km	78km W of Willow, Alaska	USGS

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

Seismograms

Seismic station: Skwentna, AK, USA (SKN/AK network) | Distance from quake: 25 km / 15 mi | Show on map | Station Info

Seismic station Skwentna, AK, 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. Source: IRIS Buffer of Uniform Data (BUD) webtool

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Seismic station Skwentna, AK, USA: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Skwentna, AK, USA: 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: Capps Glacier, Mount Spurr, Alaska (SPCG/AV network) | Distance from quake: 58 km / 36 mi | Show on map | Station Info

Seismic station Capps Glacier, Mount Spurr, Alaska: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Capps Glacier, Mount Spurr, Alaska: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Capps Glacier, Mount Spurr, 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: Rabbit Creek, AK, USA (RC01/AK network) | Distance from quake: 120 km / 75 mi | Show on map | Station Info

Seismic station Rabbit Creek, AK, USA: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Rabbit Creek, AK, USA: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Rabbit Creek, AK, USA: 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: China Poot, AK, USA (CNP/AK network) | Distance from quake: 249 km / 155 mi | Show on map | Station Info

Seismic station China Poot, AK, USA: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station China Poot, AK, USA: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station China Poot, AK, USA: 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: Baldy Mountain, AK, USA (BAL/AK network) | Distance from quake: 494 km / 307 mi | Show on map | Station Info

Seismic station Baldy Mountain, AK, USA: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Baldy Mountain, AK, USA: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Baldy Mountain, AK, USA: 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

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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