Mag. 3.5 earthquake - Napa County, 7.9 mi east of Angwin, California, USA, on Monday, 26 October 2020 at 13:38 (GMT) -
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Minor magnitude 3.5 earthquake at 9 km depth
26 Oct 13:41 UTC: First to report: USGS after 3 minutes.
26 Oct 17:56: Magnitude recalculated from 3.6 to 3.4. Hypocenter depth recalculated from 7.2 to 9.4 km (from 4.5 to 5.8 mi). Epicenter location corrected by 1.3 km (0.8 mi) towards WSW.
26 Oct 21:18: Magnitude recalculated from 3.4 to 3.5.
26 Oct 17:56: Magnitude recalculated from 3.6 to 3.4. Hypocenter depth recalculated from 7.2 to 9.4 km (from 4.5 to 5.8 mi). Epicenter location corrected by 1.3 km (0.8 mi) towards WSW.
26 Oct 21:18: Magnitude recalculated from 3.4 to 3.5.
Magnitude: 3.5
Depth: 9.4 km
Epicenter latitude / longitude: 38.5575°N / 122.306°W
(Napa County, California, United States)Nearest volcano: Clear Lake (62 km / 39 mi)
Nearby towns and cities:
13 km (8 mi) E of Angwin (pop: 3,050) --> See nearby quakes!
15 km (9 mi) NE of Rutherford (pop: 164) --> See nearby quakes!
24 km (15 mi) E of Calistoga (Napa County) (pop: 5,330) --> See nearby quakes!
29 km (18 mi) N of Napa (pop: 80,400) --> See nearby quakes!
29 km (18 mi) W of Winters (pop: 7,030) --> See nearby quakes!
36 km (22 mi) NW of Vacaville (pop: 96,800) --> See nearby quakes!
38 km (24 mi) ENE of Santa Rosa (pop: 175,000) --> See nearby quakes!
41 km (26 mi) NW of Fairfield (pop: 113,000) --> See nearby quakes!
3887 km (2415 mi) WNW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
3887 km (2415 mi) WNW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky
9.5°C (49 F), humidity: 20%, wind: 5 m/s (10 kts) from N
Primary data source: USGS (United States Geological Survey)
Clear Sky
9.5°C (49 F), humidity: 20%, wind: 5 m/s (10 kts) from NEstimated released energy: 1.1 x 1010 joules (3.12 megawatt hours, equivalent to 2.68 tons of TNT) 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 |
| M 3.5 | 9.4 km | 13km E of Angwin, CA, USA | USGS |
| M 3.2 | 10 km | Northern California, USA | EMSC |
User reports for this quake (6)
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Leave a comment if you find a particular report interesting or want to add to it.
Flag as inappropriate.
Mark as helpful or interesting.
Send your own user report!
Yountville, CA / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s : I was up reading when the house shook and glass doors in the shower rattled. The house moved enough it woke my wife from sleep. | 7 users found this interesting.
Lakeport, CA / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : I rolled to the floor in fear and panic! my wife said I was whimpering and that it was disturbing her. She then knelt down and slapped me and said, "You know what that one was for!". | 5 users found this interesting.
Lakeport, CA / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : I rolled to the floor and covered the back of my head. I was whimpering maybe crying just, a little. My wife reached down into both my nose holes with her ring and pinky finger, jammed in and pulled me up to my knees and slapped me (she slaps hard!)! She told me "you know what that was for" and pointed to the bed as direction for me to follow.
4038 E.3rd Avenue, Napa, Ca 94558 / Light shaking (MMI IV) / very short : We were awake due to a wind storm but have experienced enough earthquakes that it is very different than wind. A quick jerky feeling of the house timbers right down the the foundation, Was in the upstairs bedroom.
Napa (12.8 km ESE of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / very short
Saint Helena (United States, 27 km W of epicenter) : Brief jolt. Clearly an earthquake but short. | One user found this interesting. (reported through EMSC)
Earlier earthquakes in the same area
Mag. 3.5 earthquake - Napa County, 7.9 mi east of Angwin, California, USA, on Monday, 26 October 2020 at 13:38 (GMT)Click here to search our database for earlier earthquakes in the same area since 1900!
