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Mag. 1.4 quake - Chugach Parish, Alaska, USA, on Friday, Sep 22, 2023 11:44 pm (Anchorage time) -

Minor magnitude 1.4 earthquake at 9 km depth

23 Sep 07:46 UTC: First to report: USGS after 2 minutes.

Earthquake details

Date & time	Sep 23, 2023 07:44:52 UTC -
Local time at epicenter	Friday, Sep 22, 2023 11:44 pm (America/Anchorage GMT -8)
Status	Confirmed
Magnitude	1.4
Depth	9.4 km
Epicenter latitude / longitude	61.1712°N / 146.8258°W Chugach, Alaska, United States
Antipode	61.1712°S / 33.1742°E
Shaking intensity	Not felt
Felt
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Wrangell (175 km / 109 mi)
Weather at epicenter at time of quake	Overcast Clouds 2.1°C (36 F), humidity: 71%, wind: 4 m/s (7 kts)
Estimated seismic energy released	7.9 x 10⁶ joules (2.21 kilowatt hours) \| about seismic energy

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Nearby places

Distance	Place	Max. shaking intensity(*)	Region	Country
26 km (16 mi) E of epicenter	Valdez (pop: 3,870)	Not felt	Alaska	United States
35 km (22 mi) SSE of epicenter	Tatitlek (pop: 88)	Not felt	Valdez-Cordova, Alaska	United States
83 km (52 mi) NNW of epicenter	Glacier View (pop: 234)	Not felt	Matanuska-Susitna, Alaska	United States
87 km (54 mi) NNW of epicenter	Eureka Roadhouse (pop: 29)	Not felt	Matanuska-Susitna, Alaska	United States
91 km (56 mi) SE of epicenter	Cordova (pop: 2,200)	Not felt	Chugach, Alaska	United States
91 km (57 mi) N of epicenter	Nelchina (pop: 59)	Not felt	Valdez-Cordova, Alaska	United States
111 km (69 mi) NW of epicenter	Chickaloon (pop: 272)	Not felt	Matanuska-Susitna, Alaska	United States
120 km (74 mi) NE of epicenter	Copper Center (pop: 328)	Not felt	Valdez-Cordova, 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
1.4	9.4 km (5.8 mi)	2023-09-23 07:44:52	26 Km W of Valdez, Alaska	USGS (United States Geological Survey)
1.4	9.4 km (5.8 mi)	2023-09-23 07:44:52	Southern Alaska 0 km (0 mi) epicenter difference with USGS	RaspberryShake (RaspberryShake)
1.4	10 km (6.2 mi) (*)	2023-09-23 07:44:52	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: Valdez Marine Terminal, AK, USA (VMT/AK network) | Distance from quake: 26 km / 16 mi | Show on map | Station Info

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

Seismic station Valdez Marine Terminal, 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 Island, AK, USA (GLI/AK network) | Distance from quake: 36 km / 22 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: Fidalgo, AK, USA (FID/AK network) | Distance from quake: 51 km / 32 mi | Show on map | Station Info

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

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

Seismic station Fidalgo, 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: Klutina Pass, AK, USA (KLU/AK network) | Distance from quake: 60 km / 37 mi | Show on map | Station Info

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

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

Seismic station Klutina Pass, 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: 78 km / 49 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

User-reports for this quake

At magnitude 1.4, such a quake wouldn't normally be felt by people, but could be recorded instrumentally.

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