Light mag. 3.0 earthquake - 18 mi southeast of Ukiah, Mendocino County, California, USA, on Friday, Oct 15, 2021 12:54 pm (GMT -7) -

Light mag. 3.0 earthquake - 18 mi southeast of Ukiah, Mendocino County, California, USA, on Friday, Oct 15, 2021 12:54 pm (GMT -7)

Light magnitude 3.0 earthquake at 4 km depth

15 Oct 19:56 UTC: First to report: USGS after 2 minutes.
16 Oct 01:48: Magnitude recalculated from 3.4 to 3.0. Hypocenter depth recalculated from 0.3 to 4.4 km (from 0.2 to 2.7 mi).
Update Fri, 15 Oct 2021, 20:00
Small earthquake of magnitude 3.4 just reported 18 miles southeast of Ukiah, California, United States
3.4 quake 15 Oct 12:54 pm (GMT -7)
3.4 quake 15 Oct 12:54 pm (GMT -7)
An earthquake of magnitude 3.4 occurred only 6 minutes ago 18 miles southeast of Ukiah, California, United States, the United States Geological Survey reported.
The quake hit at a very shallow depth of 0.2 miles beneath the epicenter near Ukiah, Mendocino County, California, USA, around noon on Friday, October 15th, 2021, at 12:54 pm local time. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
A second report was later issued by the European-Mediterranean Seismological Centre (EMSC), which listed it as a magnitude 3.4 earthquake as well.
Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter.
Weak shaking might have been felt in Hopland (pop. 760) located 5 miles from the epicenter, and Cloverdale (pop. 8,800) 9 miles away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Kelseyville (pop. 3,400) located 11 miles from the epicenter, Ukiah (pop. 15,900) 18 miles away, Clearlake (pop. 15,200) 22 miles away, Russian River (pop. 11,700) 24 miles away, Russian River (pop. 11,700) 24 miles away, and Windsor (pop. 27,500) 29 miles away. In Santa Rosa (pop. 175,000, 38 miles away), the quake was probably not felt.

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Earthquake data

Date & time: Oct 15, 2021 19:54:07 UTC -
Local time at epicenter: Friday, Oct 15, 2021 12:54 pm (GMT -7)
Magnitude: 3
Depth: 4.4 km
Epicenter latitude / longitude: 38.92933°N / 123.03517°W (Mendocino, California, United States)
Antipode: 38.929°S / 56.965°E
Nearest volcano: Clear Lake (24 km / 15 mi)
Nearby towns and cities:
9 km (5 mi) SE of Hopland (pop: 756) --> See nearby quakes!
14 km (9 mi) N of Cloverdale (Sonoma County) (pop: 8,810) --> See nearby quakes!
21 km (13 mi) SSW of North Lakeport (pop: 3,310) --> See nearby quakes!
29 km (18 mi) SSE of Ukiah (pop: 15,900) --> See nearby quakes!
36 km (22 mi) W of Clearlake (Lake County) (pop: 15,200) --> See nearby quakes!
38 km (24 mi) NNW of Russian River (Sonoma County) (pop: 11,700) --> See nearby quakes!
38 km (24 mi) NNW of Russian River (pop: 11,700) --> See nearby quakes!
47 km (29 mi) NNW of Windsor (Sonoma County) (pop: 27,500) --> See nearby quakes!
61 km (38 mi) NNW of Santa Rosa (pop: 175,000) --> See nearby quakes!
139 km (86 mi) WNW of Sacramento (pop: 490,700) --> See nearby quakes!
Weather at epicenter at time of quake:
Clear Sky 25.8°C (78 F), humidity: 25%, wind: 1 m/s (3 kts) from SSW
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 2 x 109 joules (554 kilowatt hours, equivalent to 0.477 tons of TNT) 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.
Mag.DepthLocationSource
3.04.4 km14km N of Cloverdale, CAUSGS
2.010 kmNEVADAEMSC

User reports for this quake (4)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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North Lakeport, Lake, California (15.7 km NE of epicenter) [Map] / Weak shaking (MMI III) / single lateral shake / 1-2 s : in bed  
Lakeport / Weak shaking (MMI III) / complex motion difficult to describe / 2-5 s : Moderate jolt. One major and several minor lasting a few seconds  
Lakeport / Weak shaking (MMI III) / 1-2 s : A little shaky  
spring valley / Weak shaking (MMI III) / vibration and rolling / 1-2 s : shaking  
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