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Strong mag. 5.6 earthquake - North Pacific Ocean, 78 mi west of Eureka, Humboldt County, California, USA, on Saturday, September 3, 2016 at 03:27 GMT

Strong mag. 5.6 earthquake - North Pacific Ocean, 78 mi west of Eureka, Humboldt County, California, USA, on Saturday, September 3, 2016 at 03:27 GMT Strong mag. 5.6 earthquake - North Pacific Ocean, 78 mi west of Eureka, Humboldt County, California, USA, on Saturday, September 3, 2016 at 03:27 GMT

Strong magnitude 5.6 earthquake at 10 km depth

3 Sep 03:33 UTC: First to report: EMSC after 6 minutes.
Sep 3 03:35: Magnitude recalculated from 5.2 to 5.6.
Sep 3 03:37: Magnitude recalculated from 5.6 to 5.4.
Hypocenter depth recalculated from 2.0 to 10.0 km.
Sep 3 03:38: Magnitude recalculated from 5.4 to 5.6.
Hypocenter depth recalculated from 10.0 to 40.0 km.
Hypocenter depth recalculated from 40.0 to 10.0 km.

Earthquake details

Date & timeSep 3, 2016 03:27:57 UTC
Local time at epicenter
StatusConfirmed
Magnitude5.6
Depth10.0 km
Epicenter latitude / longitude40.5°N / 125.59°W (North Pacific Ocean, United States)
Antipode40.5°S / 54.41°E
Shaking intensityStrong shaking near epicenter
Felt1 report
Primary data sourceEMSC (European-Mediterranean Seismological Centre)
Nearest volcanoEscanaba Segment (168 km / 104 mi)
Nearby towns and cities112 km (70 mi) W of Ferndale (pop: 1,370) | Show on map | Quakes nearby
122 km (76 mi) W of Fortuna (Humboldt County) (pop: 12,000) | Show on map | Quakes nearby
125 km (78 mi) WSW of Eureka (Humboldt County) (pop: 27,000) | Show on map | Quakes nearby
125 km (78 mi) W of Rio Dell (pop: 3,390) | Show on map | Quakes nearby
133 km (83 mi) WSW of Arcata (Humboldt County) (pop: 17,800) | Show on map | Quakes nearby
134 km (83 mi) WSW of Bayside (Humboldt County) (pop: 17,100) | Show on map | Quakes nearby
135 km (84 mi) WSW of McKinleyville (Humboldt County) (pop: 15,200) | Show on map | Quakes nearby
139 km (86 mi) WSW of Westhaven-Moonstone (pop: 1,210) | Show on map | Quakes nearby
182 km (113 mi) SW of Crescent City (Del Norte County) (pop: 6,770) | Show on map | Quakes nearby
192 km (119 mi) NW of Fort Bragg (Mendocino County) (pop: 7,290) | Show on map | Quakes nearby
Estimated seismic energy released1.6 x 1013 joules (4.4 gigawatt hours, equivalent to 3788 tons of TNT or 0.2 atomic bombs!) | 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
5.610 km OFFSHORE NORTHERN CALIFORNIAEMSC
5.610 kmOff Coast of N. CaliforniaGFZ
5.62.2 km- 118km W of Ferndale, CaliforniaUSGS
shake map
(shakemap: USGS)

Seismograms

Seismic station: Corvallis, Oregon, USA (COR/IU network) | Distance from quake: 491 km / 305 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
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User reports for this quake (5)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Gig Harbor Wa (815 km NNE of epicenter) [Map] / Very weak shaking (MMI II) : Standing outside for astronomy check around 430am and ground shuftrd slughtly. In area of PacificNW rainforest. (reported through our app)  
Garberville (United States, 150 km E of epicenter) : I thought a bear was pushing our cabin around. Everyone felt it. It was earthquake (reported through EMSC)  
Eureka (United States, 122 km E of epicenter) : The earthquake was swift & short but jolting. (reported through EMSC)  
Aptos (United States, 493 km SE of epicenter) : Aptos near Santa Cruz (reported through EMSC)  
Fremont (United States, 444 km SE of epicenter) : Was sitting in my car actually"at (reported through EMSC)  

Aftershocks

[More info]

Recorded aftershocks, latest first (0 quake)

So far, no aftershocks have been registered.

Earlier earthquakes in the same area

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