Minor mag. 1.8 earthquake - 4km SE of St. Helena, CA, USA, on Monday, 1 Mar 2021 9:53 am (GMT -8) -

Minor mag. 1.8 earthquake - 4km SE of St. Helena, CA, USA, on Monday, 1 Mar 2021 9:53 am (GMT -8)

Minor magnitude 1.8 earthquake at 10 km depth

1 Mar 17:54 UTC: First to report: USGS after 2 minutes.
Date & time: 1 Mar 2021 17:53:04 UTC -
Local time at epicenter: Monday, 1 Mar 2021 9:53 am (GMT -8)
Magnitude: 1.8
Depth: 9.6 km
Epicenter latitude / longitude: 38.47867°N / 122.42767°W (California, United States)
Nearest volcano: Clear Lake (62 km / 39 mi)
Nearby towns and cities:
2 km (1 mi) N of Rutherford (pop: 164) --> See nearby quakes!
11 km (7 mi) S of Angwin (pop: 3,050) --> See nearby quakes!
24 km (15 mi) NNW of Napa (pop: 80,400) --> See nearby quakes!
25 km (16 mi) E of Santa Rosa (pop: 175,000) --> See nearby quakes!
28 km (18 mi) NE of Rohnert Park (pop: 42,400) --> See nearby quakes!
33 km (20 mi) NNE of Petaluma (pop: 60,400) --> See nearby quakes!
41 km (25 mi) WNW of Vacaville (pop: 96,800) --> See nearby quakes!
42 km (26 mi) NW of Fairfield (pop: 113,000) --> See nearby quakes!
44 km (28 mi) NNW of Vallejo (pop: 121,300) --> See nearby quakes!
76 km (47 mi) N of Oakland (pop: 419,300) --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky 12.6°C (55 F), humidity: 45%, wind: 1 m/s (3 kts) from ESE
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 3.2 x 107 joules (8.78 kilowatt hours) More info
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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.
MagnitudeDepthLocationSource
1.89.6 km4km SE of St. Helena, CA, USAUSGS

User reports for this quake (1)

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.
94574 / Light shaking (MMI IV)
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