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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
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.
5.610 kmOff Coast of N. CaliforniaGFZ
5.62.2 km- 118km W of Ferndale, CaliforniaUSGS
shake map
(shakemap: USGS)


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
Show more

User reports for this quake (5)

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.
Flag as inappropriate.
Mark as helpful or interesting.
Send your own user report!
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)  


[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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