Mag. 4.2 earthquake - 2.8 mi southwest of Cobb, Lake County, California, USA, on Thursday, 18 January 2018 at 05:55 (GMT)
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Light magnitude 4.2 earthquake at 2 km depth
Magnitude: 4.2
Depth: 1.8 km
Epicenter latitude / longitude: 38.785°N / 122.7433°W
(Lake County, California, United States)Nearest volcano: Clear Lake (21 km / 13 mi)
Nearby towns and cities:
4 km (3 mi) SSW of Cobb (pop: 1,780) --> See nearby quakes!
16 km (10 mi) W of Hidden Valley Lake (pop: 5,580) --> See nearby quakes!
22 km (14 mi) SSW of Clearlake (Lake County) (pop: 15,200) --> See nearby quakes!
22 km (14 mi) NNE of Healdsburg (Sonoma County) (pop: 11,700) --> See nearby quakes!
24 km (15 mi) E of Cloverdale (Sonoma County) (pop: 8,810) --> See nearby quakes!
27 km (17 mi) NNE of Windsor (Sonoma County) (pop: 27,500) --> See nearby quakes!
38 km (24 mi) N of Santa Rosa (pop: 175,000) --> See nearby quakes!
50 km (31 mi) N of Rohnert Park (pop: 42,400) --> See nearby quakes!
3917 km (2434 mi) WNW of Washington (District of Columbia) (pop: 601,700) --> See nearby quakes!
3917 km (2434 mi) WNW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.3 x 1011 joules (35 megawatt hours, equivalent to 30.1 tons of TNT) 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 4.2 | 1.8 km | - 1km NE of The Geysers, CA | USGS |
(shakemap: USGS)
User reports for this quake (11)
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Davis CA / Weak shaking (MMI III) : I was seated in my chair and felt the typical light rocking back and forth motion as if I were in a boat. Might have lasted in total about 10 seconds. No damage and I was the only one out of 4 in my house to feel it.
Lower Lake, CA / Light shaking (MMI IV) : Shook the bed. Ceiling fans were swaying. Shaking, but not rolling. Seemed to last 10-15 seconds.
Sacramento CA / Weak shaking (MMI III) : Couch moved, shook lightly. Blinds moved lightly. Subtle but present. After being in Loma Prieta earthquake, any movement is "felt".
Cobb / Strong shaking (MMI VI)
San Jose (United States, 190 km SE of epicenter) : I sensed it somehow and checked before the notice came up - but I can't say I felt any shaking - I just knew somehow - very wierd (reported through EMSC)
Pleasanton (United States, 143 km SE of epicenter) : I didn’t feel or notice it at all. I was sitting in my roller chair, but nothing shook or moved in any way. (reported through EMSC)
Alameda (United States of America, 121 km S of epicenter) : Felt a bump. Thought it was the kids or dogs. Then daughter said she felt a bump while in her bed....guess it wasn't the kids! (reported through EMSC)
Ross (United States of America, 93 km S of epicenter) : A bit surprising. I was in bed. My parents didn’t feel it. (reported through EMSC)
Rohnert Park (United States of America, 50 km S of epicenter) : Was at my computer desk. Thought it was the noisy neighbors upstairs! Thought maybe could be earthquake?! Yup, it was! My apartment creaked for a second. (reported through EMSC)
Angwin (United States, 35 km SE of epicenter) : Slight roller lasted about 10 seconds. (reported through EMSC)
Kelseyville (United States, 13 km NW of epicenter) : I was in my kitchen. I thought I was feeling dizzy, then my husband felt it too. Felt like a small wave. Really small. (reported through EMSC)
Earlier earthquakes in the same area
Mag. 4.2 earthquake - 2.8 mi southwest of Cobb, Lake County, California, USA, on Thursday, 18 January 2018 at 05:55 (GMT)Click here to search our database for earlier earthquakes in the same area since 1900!
