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Strong mag. 5.1 earthquake - North Pacific Ocean, 79 mi west of Eureka, Humboldt County, California, USA, on Fri, 20 Jul 2012 17:52

Strong mag. 5.1 earthquake - North Pacific Ocean, 79 mi west of Eureka, Humboldt County, California, USA, on Fri, 20 Jul 2012 17:52 Strong mag. 5.1 earthquake - North Pacific Ocean, 79 mi west of Eureka, Humboldt County, California, USA, on Fri, 20 Jul 2012 17:52

Strong magnitude 5.1 earthquake at 10 km depth

1 Jan 00:00 UTC: First to report: USGS after 30 seconds.

Earthquake details

Date & timeJul 21, 2012 01:52:00 UTC
Local time at epicenterFri, 20 Jul 2012 17:52
StatusConfirmed
Magnitude5.1
Depth10.0 km
Epicenter latitude / longitude40.3823°N / 125.559°W (North Pacific Ocean, California, United States)
Antipode40.382°S / 54.441°E
Shaking intensityModerate shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearby towns and cities112 km (69 mi) W of Ferndale (pop: 1,370) | Show on map | Quakes nearby
121 km (75 mi) W of Fortuna (Humboldt County) (pop: 12,000) | Show on map | Quakes nearby
124 km (77 mi) W of Rio Dell (pop: 3,390) | Show on map | Quakes nearby
127 km (79 mi) WSW of Eureka (Humboldt County) (pop: 27,000) | Show on map | Quakes nearby
136 km (84 mi) WSW of Arcata (Humboldt County) (pop: 17,800) | Show on map | Quakes nearby
136 km (85 mi) WSW of Bayside (Humboldt County) (pop: 17,100) | Show on map | Quakes nearby
138 km (86 mi) WSW of McKinleyville (Humboldt County) (pop: 15,200) | Show on map | Quakes nearby
182 km (113 mi) NW of Fort Bragg (Mendocino County) (pop: 7,290) | Show on map | Quakes nearby
191 km (118 mi) SW of Crescent City (Del Norte County) (pop: 6,770) | Show on map | Quakes nearby
243 km (151 mi) NW of Ukiah (pop: 15,900) | Show on map | Quakes nearby
Estimated seismic energy released2.8 x 1012 joules (783 megawatt hours, equivalent to 674 tons of TNT) | about seismic energy
Show interactive Map
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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
5.110 km105km W of Ferndale, CaliforniaUSGS
5.12 km OFFSHORE NORTHERN CALIFORNIAEMSC
4.810 kmOff Coast of N. CaliforniaGFZ
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.
shake map
(shakemap: USGS)

Seismograms

Seismic station: Corvallis, Oregon, USA (COR/IU network) | Distance from quake: 503 km / 312 mi | Show on map | Station Info
Seismic station Corvallis, Oregon, 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
Show more

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.

Aftershocks

[More info]

Recorded aftershocks, latest first (2 quakes)

Date and timeMag
Depth
LocationDetails
Jul 23, 2012 08:57
10 years ago
3.2

27 km
North Pacific Ocean, 70 mi SW of Eureka, Humboldt County, California, USAMore
Jul 21, 2012 06:52
10 years ago
2.9

3.1 km
North Pacific Ocean, 71 mi SW of Eureka, Humboldt County, California, USAMore

Earlier earthquakes in the same area

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