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Weak mag. 2.5 earthquake - 41km W of Petrolia, CA, on Wednesday, Sep 28, 2022 at 3:50 am (GMT -8) -

Weak mag. 2.5 earthquake - 41km W of Petrolia, CA, on Wednesday, Sep 28, 2022 at 3:50 am (GMT -8) Weak mag. 2.5 earthquake - 41km W of Petrolia, CA, on Wednesday, Sep 28, 2022 at 3:50 am (GMT -8)

Weak magnitude 2.5 earthquake at 13 km depth

28 Sep 11:52 UTC: First to report: USGS after 2 minutes.
28 Sep 16:08: Hypocenter depth recalculated from 10.4 to 13.3 km (from 6.5 to 8.3 mi). Epicenter location corrected by 7.7 km (4.8 mi) towards E.

Earthquake details

Date & timeSep 28, 2022 11:50:26 UTC -
Local time at epicenterWednesday, Sep 28, 2022 at 3:50 am (GMT -8)
StatusConfirmed
Magnitude2.5
Depth13.3 km
Epicenter latitude / longitude40.2965°N / 124.7665°W (California, United States)
Antipode40.297°S / 55.234°E
Shaking intensityVery weak shaking
Felt1 report
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoClear Lake (226 km / 140 mi)
Nearby towns and cities53 km (33 mi) SW of Ferndale (pop: 1,370) | Show on map | Quakes nearby
60 km (37 mi) WSW of Rio Dell (pop: 3,390) | Show on map | Quakes nearby
62 km (38 mi) WSW of Fortuna (Humboldt County) (pop: 12,000) | Show on map | Quakes nearby
76 km (47 mi) SW of Eureka (Humboldt County) (pop: 27,000) | Show on map | Quakes nearby
82 km (51 mi) WNW of Redway (pop: 1,230) | Show on map | Quakes nearby
85 km (53 mi) SW of Bayside (Humboldt County) (pop: 17,100) | Show on map | Quakes nearby
86 km (53 mi) SW of Arcata (Humboldt County) (pop: 17,800) | Show on map | Quakes nearby
92 km (57 mi) SW of McKinleyville (Humboldt County) (pop: 15,200) | Show on map | Quakes nearby
Weather at epicenter at time of quakeBroken Clouds 16.1°C (61 F), humidity: 88%, wind: 5 m/s (10 kts) from SSE
Estimated seismic energy released3.5 x 108 joules (98.6 kilowatt hours) | about seismic energy
Show interactive Map
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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.DepthLocationSource
2.513 km41km W of Petrolia, CAUSGS
2.510 kmOFFSHORE NORTHERN CALIFORNIAEMSC
2.513 kmNear Coast of N. CaliforniaRaspberryShake
2.510 kmNear Coast Of Northern Calif.IRIS

Seismograms

Seismic station: Marconi Conference Center, Marshall, CA, USA (MCCM/BK network) | Distance from quake: 289 km / 180 mi | Show on map | Station Info
Seismic station Marconi Conference Center, Marshall, CA, 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. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (1)

At magnitude 2.5, this quake might have been felt very close to the epicenter and under calm conditions.
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Translate
Eureka, CA / Very weak shaking (MMI II) / 15-20 s

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