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Mag. 1.1 quake - Matanuska-Susitna Parish, Alaska, USA, on Saturday, Sep 23, 2023 02:47 pm (Anchorage time) -

Minor magnitude 1.1 earthquake at 50 km depth

23 Sep 22:51 UTC: First to report: USGS after 4 minutes.

Earthquake details

Date & time	Sep 23, 2023 22:47:51 UTC -
Local time at epicenter	Saturday, Sep 23, 2023 02:47 pm (America/Anchorage GMT -8)
Status	Confirmed
Magnitude	1.1
Depth	50.1 km
Epicenter latitude / longitude	62.0598°N / 148.1673°W Matanuska-Susitna, Alaska, United States
Antipode	62.0598°S / 31.8327°E
Shaking intensity	Not felt
Felt
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Wrangell (216 km / 134 mi)
Weather at epicenter at time of quake	Overcast Clouds 0.9°C (34 F), humidity: 81%, wind: 1 m/s (3 kts) from SSW
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
33 km (21 mi) SSW of epicenter	Chickaloon (pop: 272)	Not felt	Matanuska-Susitna, Alaska	United States
44 km (28 mi) SW of epicenter	Sutton-Alpine (pop: 1,450)	Not felt	Matanuska-Susitna, Alaska	United States
66 km (41 mi) WSW of epicenter	Fishhook (pop: 4,680)	Not felt	Matanuska-Susitna, Alaska	United States
71 km (44 mi) SW of epicenter	Palmer (pop: 6,790)	Not felt	Matanuska-Susitna, Alaska	United States
78 km (49 mi) SW of epicenter	Lakes (pop: 8,360)	Not felt	Matanuska-Susitna, Alaska	United States
97 km (60 mi) SW of epicenter	Knik-Fairview (pop: 14,900)	Not felt	Matanuska-Susitna, Alaska	United States
110 km (69 mi) SW of epicenter	Eagle River (pop: 24,800)	Not felt	Anchorage, Alaska	United States
131 km (81 mi) SW of epicenter	Alaska City (pop: 298,700)	Not felt	Anchorage, 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	50 km (31 mi)	2023-09-23 22:47:51	33 Km NNE of Chickaloon, Alaska	USGS (United States Geological Survey)
1.1	50 km (31 mi)	2023-09-23 22:47:51	Central Alaska 0 km (0 mi) epicenter difference with USGS	RaspberryShake (RaspberryShake)
1.1	10 km (6.2 mi) (*)	2023-09-23 22:47:51	Central 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: Sawmill, AK, USA (SAW/AK network) | Distance from quake: 29 km / 18 mi | Show on map | Station Info

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

Seismic station Sawmill, 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: Glacier View, AK, USA (M23K/AK network) | Distance from quake: 38 km / 23 mi | Show on map | Station Info

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

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

Seismic station Glacier View, 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: Sheep Mountain, AK, USA (SCM/AK network) | Distance from quake: 51 km / 31 mi | Show on map | Station Info

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

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

Seismic station Sheep 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

Seismic station: Susitna Watana 6, AK, USA (WAT6/AK network) | Distance from quake: 62 km / 39 mi | Show on map | Station Info

Seismic station Susitna Watana 6, AK, USA: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Susitna Watana 6, AK, USA: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Susitna Watana 6, 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: Palmer, Alaska (PMR/AT network) | Distance from quake: 73 km / 45 mi | Show on map | Station Info

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

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

Seismic station Palmer, 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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