Minor mag. 1.8 earthquake - 7km N of Petrolia, CA, USA, on Tuesday, 23 Feb 2021 11:41 pm (GMT -8) -
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Minor magnitude 1.8 earthquake at 21 km depth
24 Feb 07:43 UTC: First to report: USGS after 2 minutes.
24 Feb 17:42: Magnitude recalculated from 1.6 to 1.8. Hypocenter depth recalculated from 20.6 to 21.2 km (from 12.8 to 13.2 mi). Epicenter location corrected by 1.6 km (1 mi) towards SE.
24 Feb 17:42: Magnitude recalculated from 1.6 to 1.8. Hypocenter depth recalculated from 20.6 to 21.2 km (from 12.8 to 13.2 mi). Epicenter location corrected by 1.6 km (1 mi) towards SE.
Date & time: 24 Feb 2021 07:41:17 UTC -
Local time at epicenter: Tuesday, 23 Feb 2021 11:41 pm (GMT -8)
Magnitude: 1.8
Depth: 21.2 km
Epicenter latitude / longitude: 40.38383°N / 124.29783°W
(California, United States)Nearest volcano: Clear Lake (206 km / 128 mi)
Nearby towns and cities:
20 km (12 mi) SW of Scotia (Humboldt County) (pop: 850) --> See nearby quakes!
22 km (13 mi) S of Ferndale (pop: 1,370) --> See nearby quakes!
27 km (17 mi) SSW of Fortuna (Humboldt County) (pop: 12,000) --> See nearby quakes!
48 km (30 mi) SSW of Eureka (Humboldt County) (pop: 27,000) --> See nearby quakes!
50 km (31 mi) NW of Redway (pop: 1,230) --> See nearby quakes!
55 km (34 mi) SSW of Bayside (Humboldt County) (pop: 17,100) --> See nearby quakes!
57 km (35 mi) SSW of Arcata (Humboldt County) (pop: 17,800) --> See nearby quakes!
65 km (40 mi) SSW of McKinleyville (Humboldt County) (pop: 15,200) --> See nearby quakes!
163 km (101 mi) W of Redding (pop: 91,600) --> See nearby quakes!
166 km (103 mi) NW of Ukiah (pop: 15,900) --> See nearby quakes!
Weather at epicenter at time of quake:
Overcast Clouds
7.5°C (46 F), humidity: 87%, wind: 5 m/s (9 kts) from WNW
Primary data source: USGS (United States Geological Survey)Overcast Clouds
7.5°C (46 F), humidity: 87%, wind: 5 m/s (9 kts) from WNWEstimated released energy: 3.2 x 107 joules (8.78 kilowatt hours) More info
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.
| Magnitude | Depth | Location | Source |
| 1.8 | 21 km | 7km N of Petrolia, CA, USA | USGS |
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
At magnitude 1.8, such a quake wouldn't normally be felt by people, but could be recorded instrumentally.
