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Moderate mag. 4.3 earthquake - 5.9 mi north of Redwood Valley, Mendocino County, California, USA, on 2019-04-28 23:16:08 -08:00

Moderate mag. 4.3 earthquake - 5.9 mi north of Redwood Valley, Mendocino County, California, USA, on 2019-04-28 23:16:08 -08:00 Moderate mag. 4.3 earthquake - 5.9 mi north of Redwood Valley, Mendocino County, California, USA, on 2019-04-28 23:16:08 -08:00

Moderate magnitude 4.3 earthquake at 3 km depth

29 Apr 07:19 UTC: First to report: USGS after 3 minutes.
Hypocenter depth recalculated from 20.0 to 4.0 km.
Apr 29 07:37: Magnitude recalculated from 4.2 to 4.3.
Hypocenter depth recalculated from 4.0 to 3.1 km.

Earthquake details

Date & timeApr 29, 2019 07:16:08 UTC
Local time at epicenter2019-04-28 23:16:08 -08:00
Depth3.1 km
Epicenter latitude / longitude39.34767°N / 123.23517°W (Mendocino, California, United States)
Antipode39.348°S / 56.765°E
Shaking intensityModerate shaking
Felt22 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoClear Lake (58 km / 36 mi)
Nearby towns and cities10 km (6 mi) NNW of Redwood Valley (pop: 1,730) | Show on map | Quakes nearby
12 km (8 mi) ESE of Little Lake (pop: 4,860) | Show on map | Quakes nearby
22 km (14 mi) N of Ukiah (pop: 15,900) | Show on map | Quakes nearby
42 km (26 mi) NW of Nice (pop: 2,730) | Show on map | Quakes nearby
44 km (27 mi) NW of Lakeport (pop: 4,810) | Show on map | Quakes nearby
50 km (31 mi) ESE of Fort Bragg (Mendocino County) (pop: 7,290) | Show on map | Quakes nearby
68 km (42 mi) NW of Clearlake (Lake County) (pop: 15,200) | Show on map | Quakes nearby
96 km (60 mi) NNW of Windsor (Sonoma County) (pop: 27,500) | Show on map | Quakes nearby
111 km (69 mi) NNW of Santa Rosa (pop: 175,000) | Show on map | Quakes nearby
173 km (107 mi) WNW of Sacramento (pop: 490,700) | Show on map | Quakes nearby
Estimated seismic energy released1.8 x 1011 joules (49.4 megawatt hours, equivalent to 42.5 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.
4.33.1 km10km NNW of Redwood Valley, CA (USA)USGS
4.24 kmNorthern California (USA)EMSC


Seismic station: Columbia College, Columbia, CA, USA (CMB/BK network) | Distance from quake: 287 km / 178 mi | Show on map | Station Info
Seismic station Columbia College, Columbia, 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 (27)

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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95427 / Light shaking (MMI IV) : I was reading in bed , Heard a loud boom followed perhape 1 or 2 seconds later by mild shaking. About 20 miles west of Redwood Valley 95427  
willits, ca pine mountain / Moderate shaking (MMI V) : Woke me up, felt movement then a sharp jolt. Lamp on dresser shook.  
redwood valley / Moderate shaking (MMI V)
23325 live Oak rd / Moderate shaking (MMI V)
Willits / Moderate shaking (MMI V)
Upper lake, ca. / Strong shaking (MMI VI) : Woke me up, my bird went crazy . It was moderate but didn't last long just long enough to wake me and check on my Parrott. Short time frame  
Debbie Gregg Redwood Valley. / Strong shaking (MMI VI) : It shook my awake in my RV. Felt like someone was at the SE corner trying to knock it over.  
ukiah / Weak shaking (MMI III)
Redwood Valley, ca / Moderate shaking (MMI V) : No damage noted but it shook hard and it seemed like there was almost a deep rumbling noise or popping sound with it  
Douglas City California / not felt : When I woke up at 4 in the morning actually 5 I have a bed on Wheels and it was moving and I thought there was an earthquake 91 miles away from me  
Redwood Valley / Moderate shaking (MMI V) : Definitely like riding a wave.  
Chico (118.2 km ENE of epicenter) [Map] / Light shaking (MMI IV) : I was getting my coffee like I always do at four am before work then soon I felt shaking  
Calpella Ca / Moderate shaking (MMI V)
Hanford ca. (459.5 km SE of epicenter) [Map] / not felt (reported through our app)
UKIAH / Weak shaking (MMI III) : Less than a minute, mild rolling and swaying sensation of the house. Ceiling fixture swung. Nothing fell over, no breakage.  
Willits ca locust st / Strong shaking (MMI VI) : This was a sharp hard jolt I was at door of apartment and tossed me towards the door. Usually we feel light jolts here but this one was very hard and violet but was over quickly.  
Mendocino, CA (49.9 km W of epicenter) [Map] / Light shaking (MMI IV) : Laying in bed at my hotel, sounded at first like the people above dropped something heavy, but then the floors and walls shook a little, and I realized it was an earthquake. Only a few seconds.  
Fort Bragg, California / Light shaking (MMI IV)
Willits,Ca / Moderate shaking (MMI V)
Calpella CA (16.6 km SSE of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
Ukiah ca / Light shaking (MMI IV) : It started with my 3 cats freaking out and jumping up and running around.. them 4sec later the whole Apt started to shake and kept shaking for over a min then some mini after shocks... Then we all felt kinda dizzy and off balance for a few mins... Nothing  
Gurley Lane, Mendocino,CA / Moderate shaking (MMI V)
Willits, CA / Light shaking (MMI IV) : Sharp jolt, but very brief in duration  
Ukiah (22.7 km SSE of epicenter) [Map] / Moderate shaking (MMI V)
San Francisco (United States of America, 188 km S of epicenter) : I felt nothing here in San Francisco, neither did my wife (reported through EMSC)  
Ukiah (United States of America, 22 km S of epicenter) : Brief (reported through EMSC)  
Redwood Valley (United States of America, 13 km S of epicenter) : Was a pretty good shake. Freaked out my dogs...took a few minutes for them to calm down... (reported through EMSC)  
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