Mag. 2.3 earthquake - 5.1 mi south of Cobb, California, USA, on 4 Oct 2:58 am (GMT -7) -
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Minor magnitude 2.3 earthquake at 1 km depth
4 Oct 10:02 UTC: First to report: EMSC after 4 minutes.
Local time at epicenter: 4 Oct 2:58 am (GMT -7)
Magnitude: 2.3
Depth: 1.0 km
Epicenter latitude / longitude: 38.75°N / 122.74°W
(Lake County, California, United States)Nearest volcano: Clear Lake (25 km / 16 mi)
Nearby towns and cities:
8 km (5 mi) S of Cobb (pop: 1,780) --> See nearby quakes!
11 km (7 mi) W of Middletown (pop: 1,320) --> See nearby quakes!
19 km (12 mi) NE of Healdsburg (Sonoma County) (pop: 11,700) --> See nearby quakes!
24 km (15 mi) NNE of Windsor (Sonoma County) (pop: 27,500) --> See nearby quakes!
24 km (15 mi) NW of Calistoga (Napa County) (pop: 5,330) --> See nearby quakes!
25 km (15 mi) ESE of Cloverdale (Sonoma County) (pop: 8,810) --> See nearby quakes!
25 km (16 mi) SSW of Clearlake (Lake County) (pop: 15,200) --> See nearby quakes!
34 km (21 mi) N of Santa Rosa (pop: 175,000) --> See nearby quakes!
3918 km (2434 mi) WNW of Washington (District of Columbia) (pop: 601,700) --> See nearby quakes!
3918 km (2434 mi) WNW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky
17.2°C (63 F), humidity: 70%, wind: 3 m/s (5 kts) from NNW
Primary data source: EMSC (European-Mediterranean Seismological Centre)
Clear Sky
17.2°C (63 F), humidity: 70%, wind: 3 m/s (5 kts) from NNWEstimated released energy: 1.8 x 108 joules (49.4 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 |
| M 2.3 | 1 km | Northern California, USA | EMSC |
User reports for this quake (1)
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
At magnitude 2.3, this quake was probably too small to be felt by humans, but it could be recorded instrumentally.
potter valley (77.2 km WNW of epicenter) [Map] / Moderate shaking (MMI V) / rattling, vibrating / 2-5 s
Earlier earthquakes in the same area
Mag. 2.3 earthquake - 5.1 mi south of Cobb, California, USA, on 4 Oct 2:58 am (GMT -7)Click here to search our database for earlier earthquakes in the same area since 1900!
