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Minor mag. 1.0 earthquake - Quarry Blast - 6km NNW of Azusa, CA, on Friday, Sep 30, 2022 at 12:08 pm (GMT -7) -

Minor magnitude 1.0 earthquake at 1 km depth

30 Sep 19:12 UTC: First to report: USGS after 4 minutes.
30 Sep 23:24: Magnitude recalculated from 1.4 to 1.0. Hypocenter depth recalculated from 5.8 to 0.9 km (from 3.6 to 0.6 mi). Epicenter location corrected by 20 km (12 mi) towards N.

Earthquake details

Date & time	Sep 30, 2022 19:08:26 UTC -
Local time at epicenter	Friday, Sep 30, 2022 at 12:08 pm (GMT -7)
Status	Confirmed
Magnitude	1
Depth	0.9 km
Epicenter latitude / longitude	34.18383°N / 117.92233°W (California, United States)
Antipode	34.184°S / 62.078°E
Shaking intensity	Very weak shaking
Felt	0 reports
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Lavic Lake (135 km / 84 mi)
Nearby towns and cities	6 km (4 mi) NNW of Azusa (pop: 49,700) \| Show on map \| Quakes nearby 7 km (4 mi) NE of Duarte (Los Angeles County) (pop: 22,000) \| Show on map \| Quakes nearby 7 km (5 mi) NW of Glendora (pop: 52,000) \| Show on map \| Quakes nearby 8 km (5 mi) ENE of Monrovia (Los Angeles County) (pop: 37,500) \| Show on map \| Quakes nearby 11 km (7 mi) NNW of Covina (pop: 49,000) \| Show on map \| Quakes nearby 12 km (7 mi) NNE of Baldwin Park (pop: 77,100) \| Show on map \| Quakes nearby 21 km (13 mi) NW of Pomona (pop: 153,300) \| Show on map \| Quakes nearby 28 km (18 mi) WNW of Ontario (pop: 171,200) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake	Clear Sky 25.9°C (79 F), humidity: 62%, wind: 4 m/s (7 kts) from S
Estimated seismic energy released	2 x 10⁶ joules (0.554 kilowatt hours) \| 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
1.0	0.9 km	Quarry Blast - 6km NNW of Azusa, CA	USGS
1.0	0.9 km	Southern California	RaspberryShake

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

Seismograms

Seismic station: Mount Wilson Obsv (MWC/CI network) | Distance from quake: 13 km / 8 mi | Show on map | Station Info

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

Seismic station Mount Wilson Obsv: 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: Art Center College of Design (GSN-affiliate) (PASC/CI network) | Distance from quake: 24 km / 15 mi | Show on map | Station Info

Seismic station Art Center College of Design (GSN-affiliate): vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Art Center College of Design (GSN-affiliate): horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Art Center College of Design (GSN-affiliate): 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: Green Verdugo Site (DEC/CI network) | Distance from quake: 39 km / 24 mi | Show on map | Station Info

Seismic station Green Verdugo Site: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Green Verdugo Site: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Green Verdugo Site: 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: Adelanto Receiving (ADO/CI network) | Distance from quake: 61 km / 38 mi | Show on map | Station Info

Seismic station Adelanto Receiving: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Adelanto Receiving: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Adelanto Receiving: 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: Rancho Palos Verdes (RPV/CI network) | Distance from quake: 66 km / 41 mi | Show on map | Station Info

Seismic station Rancho Palos Verdes: vertical movement plot around time of quake (source: IRIS/BUD)

Seismic station Rancho Palos Verdes: horizontal (E-W) movement plot around time of quake (source: IRIS/BUD)

Seismic station Rancho Palos Verdes: 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 1.0, such a quake wouldn't normally be felt by people, but could be recorded instrumentally.

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