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Light mag. 3.3 earthquake - 29 mi south of Skwentna, Matanuska-Susitna, Alaska, USA, on Sunday, February 22, 2015 09:24:14

Light magnitude 3.3 earthquake at 4 km depth

22 Feb 20:10 UTC: First to report: USGS after 1 hour and 46 minutes.
Feb 23 08:10: Magnitude recalculated from 3.5 to 3.3.
Hypocenter depth recalculated from 10.7 to 4.1 km.

Earthquake details

Date & time	Feb 22, 2015 18:24:14 UTC
Local time at epicenter	Sunday, February 22, 2015 09:24:14
Status	Confirmed
Magnitude	3.3
Depth	4.1 km
Epicenter latitude / longitude	61.5877°N / 151.6154°W (Matanuska-Susitna, Alaska, United States)
Antipode	61.588°S / 28.385°E
Shaking intensity	Light shaking near epicenter
Felt	0 reports
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Hayes (36 km / 22 mi)
Nearby towns and cities	46 km (29 mi) SSW of Skwentna (pop: 37) \| Show on map \| Quakes nearby 85 km (53 mi) WSW of Willow Creek (pop: 2,100) \| Show on map \| Quakes nearby 88 km (55 mi) W of Big Lake (pop: 3,350) \| Show on map \| Quakes nearby 95 km (59 mi) W of Houston (pop: 2,210) \| Show on map \| Quakes nearby 100 km (62 mi) WNW of Alaska City (pop: 298,700) \| Show on map \| Quakes nearby 107 km (66 mi) W of Meadow Lakes (pop: 7,570) \| Show on map \| Quakes nearby 107 km (67 mi) W of Knik-Fairview (pop: 14,900) \| Show on map \| Quakes nearby 113 km (70 mi) WNW of Eagle River (pop: 24,800) \| Show on map \| Quakes nearby 113 km (70 mi) WNW of Eagle River (Anchorage) (pop: 24,800) \| Show on map \| Quakes nearby 117 km (72 mi) N of Kenai (pop: 7,660) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake
Estimated seismic energy released	5.6 x 10⁹ joules (1.56 megawatt hours, equivalent to 1.34 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
3.3	4.1 km	85km WSW of Willow, Alaska	USGS

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

Seismograms

Seismic station: Strandline Lake, Regional Station, Alaska (STLK/AV network) | Distance from quake: 15 km / 10 mi | Show on map | Station Info

Seismic station Strandline Lake, Regional Station, 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. Source: IRIS Buffer of Uniform Data (BUD) webtool

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

Seismic station Strandline Lake, Regional Station, 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: Mount Spurr, Mount Spurr, Alaska (SPU/AV network) | Distance from quake: 51 km / 32 mi | Show on map | Station Info

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

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

Seismic station Mount Spurr, 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: Redoubt, Alaska (RDT/AV network) | Distance from quake: 121 km / 75 mi | Show on map | Station Info

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

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

Seismic station Redoubt, 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: Glacier Island, AK, USA (GLI/AK network) | Distance from quake: 254 km / 158 mi | Show on map | Station Info

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

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

Seismic station Glacier Island, 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: Mt. Peulik Volcano, Alaska (PLBL/AV network) | Distance from quake: 522 km / 324 mi | Show on map | Station Info

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

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

Seismic station Mt. Peulik 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

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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