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Light mag. 3.5 earthquake - Napa County, 7.9 mi east of Angwin, California, USA, on Monday, October 26, 2020 at 13:38 GMT

Light mag. 3.5 earthquake - Napa County, 7.9 mi east of Angwin, California, USA, on Monday, October 26, 2020 at 13:38 GMT Light mag. 3.5 earthquake - Napa County, 7.9 mi east of Angwin, California, USA, on Monday, October 26, 2020 at 13:38 GMT

Light 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.

Earthquake details

Date & timeOct 26, 2020 13:38:36 UTC
Local time at epicenter
Depth9.4 km
Epicenter latitude / longitude38.5575°N / 122.306°W (Napa, California, United States)
Antipode38.558°S / 57.694°E
Shaking intensityLight shaking
Felt5 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoClear Lake (62 km / 39 mi)
Nearby towns and cities13 km (8 mi) E of Angwin (pop: 3,050) | Show on map | Quakes nearby
29 km (18 mi) N of Napa (pop: 80,400) | Show on map | Quakes nearby
36 km (22 mi) NW of Vacaville (pop: 96,800) | Show on map | Quakes nearby
38 km (24 mi) ENE of Santa Rosa (pop: 175,000) | Show on map | Quakes nearby
41 km (26 mi) NW of Fairfield (pop: 113,000) | Show on map | Quakes nearby
46 km (29 mi) NE of Petaluma (pop: 60,400) | Show on map | Quakes nearby
48 km (30 mi) WSW of Woodland (pop: 58,600) | Show on map | Quakes nearby
49 km (31 mi) W of Davis (pop: 67,700) | Show on map | Quakes nearby
71 km (44 mi) W of Sacramento (pop: 490,700) | Show on map | Quakes nearby
88 km (54 mi) N of San Francisco (pop: 864,800) | Show on map | Quakes nearby
Weather at epicenter at time of quakeClear Sky 9.5°C (49 F), humidity: 20%, wind: 5 m/s (10 kts) from N
Estimated seismic energy released1.1 x 1010 joules (3.12 megawatt hours, equivalent to 2.68 tons of TNT) | about seismic energy
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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.
3.59.4 km13km E of Angwin, CA, USAUSGS
3.210 kmNorthern California, USAEMSC


Seismic station: Marconi Conference Center, Marshall, CA, USA (MCCM/BK network) | Distance from quake: 68 km / 42 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 (6)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Leave a comment if you find a particular report interesting or want to add to it.
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Mark as helpful or interesting.
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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   
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

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