Minor mag. 1.9 earthquake - 6km ESE of St. Helena, CA, USA, on Tuesday, 2 Mar 2021 4:47 pm (GMT -8) -
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Minor magnitude 1.9 earthquake at 7 km depth
3 Mar 00:49 UTC: First to report: USGS after 2 minutes.
3 Mar 22:32: Hypocenter depth recalculated from 6.8 to 7.4 km (from 4.2 to 4.6 mi).
3 Mar 22:32: Hypocenter depth recalculated from 6.8 to 7.4 km (from 4.2 to 4.6 mi).
Date & time: 3 Mar 2021 00:47:51 UTC -
Local time at epicenter: Tuesday, 2 Mar 2021 4:47 pm (GMT -8)
Magnitude: 1.9
Depth: 7.4 km
Epicenter latitude / longitude: 38.4825°N / 122.40583°W
(California, United States)Nearest volcano: Clear Lake (63 km / 39 mi)
Nearby towns and cities:
3 km (2 mi) NNE of Rutherford (pop: 164) --> See nearby quakes!
11 km (7 mi) SSE of Angwin (pop: 3,050) --> See nearby quakes!
22 km (13 mi) NNE of Sonoma (pop: 11,000) --> See nearby quakes!
23 km (14 mi) NNW of Napa (pop: 80,400) --> See nearby quakes!
27 km (17 mi) E of Santa Rosa (pop: 175,000) --> See nearby quakes!
30 km (19 mi) ENE of Rohnert Park (pop: 42,400) --> See nearby quakes!
34 km (21 mi) NE of Petaluma (pop: 60,400) --> See nearby quakes!
39 km (24 mi) WNW of Vacaville (pop: 96,800) --> See nearby quakes!
41 km (26 mi) NW of Fairfield (pop: 113,000) --> See nearby quakes!
65 km (40 mi) NNW of Concord (pop: 128,700) --> See nearby quakes!
Weather at epicenter at time of quake:
Overcast Clouds
16.1°C (61 F), humidity: 25%, wind: 1 m/s (2 kts) from W
Primary data source: USGS (United States Geological Survey)Overcast Clouds
16.1°C (61 F), humidity: 25%, wind: 1 m/s (2 kts) from WEstimated released energy: 4.5 x 107 joules (12.4 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 |
| 1.9 | 7.4 km | 6km ESE of St. Helena, 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 1.9, such a quake wouldn't normally be felt by people, but could be recorded instrumentally.
