Mag. 4.2 earthquake - 6.8 mi southeast of Willits, Mendocino County, California, on Wednesday, 19 August 2020 at 00:55 (GMT) -

Mag. 4.2 earthquake  - 6.8 mi southeast of Willits, Mendocino County, California, on Wednesday, 19 August 2020 at 00:55 (GMT)

Light magnitude 4.2 earthquake at 8 km depth

19 Aug 00:56 UTC: First to report: USGS after 1 minutes.
Aug 19 00:59: Magnitude recalculated from 4.3 to 4.0.
Hypocenter depth recalculated from 8.0 to 7.5 km.
Aug 19 03:32: Magnitude recalculated from 4.0 to 4.6.
Date & time: 19 Aug 2020 12:55:23 UTC -
Magnitude: 4.2
Depth: 8.2 km
Epicenter latitude / longitude: 39.3605°N / 123.24583°W (California, United States)
Nearest volcano: Clear Lake (60 km / 37 mi)
Nearby towns and cities:
5 km (3 mi) ENE of Ridge (Mendocino County)
11 km (7 mi) ESE of Willits (Mendocino County) (pop: 4,860)
11 km (7 mi) NNW of Redwood Valley (Mendocino County) (pop: 1,730)
12 km (8 mi) WNW of Potter Valley (Mendocino County) (pop: 646)
26 km (16 mi) NNW of Talmage (Mendocino County) (pop: 1,130)
49 km (30 mi) E of Fort Bragg (Mendocino County) (pop: 7,290)
136 km (85 mi) NNW of Petaluma (Sonoma County) (pop: 60,400)
185 km (115 mi) WNW of Rocklin (pop: 61,200)
Primary data source: USGS
Estimated released energy: 1.3 x 1011 joules (35 megawatt hours, equivalent to 30.1 tons of TNT) [learn more]
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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.
M 4.28.2 km11km ESE of Willits, CA (USA)USGS
M 4.68 kmNorthern California (USA)EMSC
M 3.88.2 km11km ESE of Willits, CA (USA)USGS
M 4.28.2 km11km ESE of Willits, CA (USA)USGS

User reports for this quake (15)

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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Willits, CA (10.5 km WNW of epicenter) [Map] / Moderate shaking (MMI V) : First earthquake had us shaking a little bit for a few seconds; the first aftershock was a little mellower, but the second aftershock was stronger than the original earthquake and lasted seconds longer. | One user found this interesting.
43.6 km SE of epicenter [Map] / Light shaking (MMI IV) : It was sharp and rumbling for an extended period of time. I thought it was over and it kept going. Felt vertigo | One user found this interesting.
45.4 km W of epicenter [Map] / Weak shaking (MMI III) (reported through our app)
2700 Road I Redwood Valley, ca (10.1 km SSE of epicenter) [Map] / Moderate shaking (MMI V)
Willits / Light shaking (MMI IV) : I was setting in my chair reading. The jolt felt like a truck had hit the house. The shaking then diminished somewhat and continued for about 15-20 seconds. The two aftershocks were just jolts and didn't last more than a few seconds.
Howard Hospital Willits CA / Light shaking (MMI IV) : I heard a slight rumbling and there was a slight shaking, but then the rumbling and shaking intensified.
Lodi / not felt
coeur d alene idaho / Light shaking (MMI IV) : woke us up out of bed
Anaheim / Light shaking (MMI IV)
Willits ca / Severe shaking (MMI VIII)
Willits ca / Weak shaking (MMI III) : I was just sitting down and felt 4 Aftershocks
Willits, CA / Light shaking (MMI IV)
Brook trails ca / Light shaking (MMI IV)
Willits / Weak shaking (MMI III)
Potter Valley / Light shaking (MMI IV)
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Earlier earthquakes in the same area since 1900

Mag. 4.2 earthquake - 6.8 mi southeast of Willits, Mendocino County, California, on Wednesday, 19 August 2020 at 00:55 (GMT)

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