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Mag. 1.1 quake - Matanuska-Susitna Parish, Alaska, USA, on Saturday, Sep 23, 2023 03:07 am (Anchorage time) -

Minor magnitude 1.1 earthquake at 86 km depth

23 Sep 11:10 UTC: First to report: USGS after 3 minutes.

Earthquake details

Date & time	Sep 23, 2023 11:07:22 UTC -
Local time at epicenter	Saturday, Sep 23, 2023 03:07 am (America/Anchorage GMT -8)
Status	Confirmed
Magnitude	1.1
Depth	86.0 km
Epicenter latitude / longitude	61.9438°N / 151.9121°W Matanuska-Susitna, Alaska, United States
Antipode	61.9438°S / 28.0879°E
Shaking intensity	Not felt
Felt
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Hayes (47 km / 29 mi)
Weather at epicenter at time of quake	Broken Clouds 4.4°C (40 F), humidity: 74%, wind: 1 m/s (1 kts) from WSW
Estimated seismic energy released	2.8 x 10⁶ joules (0.783 kilowatt hours) \| about seismic energy

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Nearby places

Distance	Place	Max. shaking intensity(*)	Region	Country
27 km (17 mi) ENE of epicenter	Skwentna (pop: 37)	Not felt	Matanuska-Susitna, Alaska	United States
86 km (53 mi) ESE of epicenter	Susitna (pop: 18)	Not felt	Alaska	United States
100 km (62 mi) SSE of epicenter	Beluga (pop: 20)	Not felt	Kenai Peninsula, Alaska	United States
101 km (63 mi) E of epicenter	Willow Creek (pop: 2,100)	Not felt	Matanuska-Susitna, Alaska	United States
103 km (64 mi) ENE of epicenter	Talkeetna (pop: 876)	Not felt	Matanuska-Susitna, Alaska	United States
109 km (68 mi) ENE of epicenter	Chase (pop: 34)	Not felt	Matanuska-Susitna, Alaska	United States

Notes:
(*) Shaking intensity according to the Modified Mercalli Intensity Scale (MMI) and estimated using seismic models.

Compare Quake Data

Data for the same earthquake as reported by different agencies

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	Time GMT	Epicenter	Agency
1.1	86 km (53 mi)	2023-09-23 11:07:22	Southern Alaska	USGS (United States Geological Survey)
1.1	86 km (53 mi)	2023-09-23 11:07:22	Southern Alaska 0 km (0 mi) epicenter difference with USGS	RaspberryShake (RaspberryShake)
1.1	10 km (6.2 mi) (*)	2023-09-23 11:07:22	Southern Alaska 0 km (0 mi) epicenter difference with USGS	IRIS (Incorporated Research Institutions for Seismology)

Notes:
(*) A depth given as 10 km often means that the the depth of the quake could not determined with sufficient accuracy.

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: 20 km / 13 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. Bandpass filter applied: 0.5-10.0 Hz. 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: Strandline Lake, Regional Station, Alaska (STLK/AV network) | Distance from quake: 50 km / 31 mi | Show on map | Station Info

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

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.
Top: vertical movement, bottom: horizontal (E-W and N-S) movements. Source: IRIS Buffer of Uniform Data (BUD) webtool

Seismic station: Spurr Beluga Lake, Mount Spur, Alaska (SPBL/AV network) | Distance from quake: 63 km / 39 mi | Show on map | Station Info

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

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

Seismic station Spurr Beluga Lake, Mount Spur, 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: Capps Glacier, Mount Spurr, Alaska (SPCG/AV network) | Distance from quake: 73 km / 45 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: Barrier Glacier, Mount Spurr, Alaska (SPBG/AV network) | Distance from quake: 80 km / 50 mi | Show on map | Station Info

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

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

Seismic station Barrier 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

User-reports for this quake

At magnitude 1.1, such a quake wouldn't normally be felt by people, but could be recorded instrumentally.

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