Contact | RSS | EN | DE | EL | ES | FR | IT | RU

Strong mag. 5.6 earthquake - North Pacific Ocean, 46 mi southwest of Eureka, Humboldt County, California, USA, on 2017-09-22 11:50:36 -08:00

Strong mag. 5.6 earthquake - North Pacific Ocean, 46 mi southwest of Eureka, Humboldt County, California, USA, on 2017-09-22 11:50:36 -08:00 Strong mag. 5.6 earthquake - North Pacific Ocean, 46 mi southwest of Eureka, Humboldt County, California, USA, on 2017-09-22 11:50:36 -08:00

Strong magnitude 5.6 earthquake at 5 km depth

22 Sep 19:56 UTC: First to report: USGS after 6 minutes.
Sep 22 20:01: Magnitude recalculated from 4.7 to 5.6.

Earthquake details

Date & timeSep 22, 2017 19:50:36 UTC
Local time at epicenter2017-09-22 11:50:36 -08:00
StatusConfirmed
Magnitude5.6
Depth4.6 km
Epicenter latitude / longitude40.4823°N / 124.9405°W (North Pacific Ocean, California, United States)
Antipode40.482°S / 55.06°E
Shaking intensityModerate shaking
Felt7 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoEscanaba Segment (223 km / 139 mi)
Nearby towns and cities58 km (36 mi) W of Ferndale (pop: 1,370) | Show on map | Quakes nearby
67 km (42 mi) W of Fortuna (Humboldt County) (pop: 12,000) | Show on map | Quakes nearby
71 km (44 mi) W of Rio Dell (pop: 3,390) | Show on map | Quakes nearby
75 km (46 mi) WSW of Eureka (Humboldt County) (pop: 27,000) | Show on map | Quakes nearby
84 km (52 mi) WSW of Arcata (Humboldt County) (pop: 17,800) | Show on map | Quakes nearby
84 km (52 mi) WSW of Bayside (Humboldt County) (pop: 17,100) | Show on map | Quakes nearby
88 km (54 mi) SW of McKinleyville (Humboldt County) (pop: 15,200) | Show on map | Quakes nearby
94 km (59 mi) SW of Westhaven-Moonstone (pop: 1,210) | Show on map | Quakes nearby
209 km (130 mi) NW of Ukiah (pop: 15,900) | Show on map | Quakes nearby
266 km (166 mi) SW of Ashland (Oregon) (pop: 20,900) | 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
[smaller] [bigger]

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
5.711 km- 218km W of Ferndale, CaliforniaUSGS
shake map
(shakemap: USGS)

Seismograms

Seismic station: Corvallis, Oregon, USA (COR/IU network) | Distance from quake: 476 km / 295 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 (15)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Contribute:
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!
Translate
Wolvega, Netherland (8617.4 km NNE of epicenter) [Map] / not felt
Lake Forest (995.2 km SE of epicenter) [Map] / Moderate shaking (MMI V) (reported through our app)
robertsdale alabama / Moderate shaking (MMI V) : I felt like a tree hit ground really hard could feel house shake even ran outside to see what hit the earth very strong force. And I'm located close to mobile alabama east about 25 miles.  
Anaconda, Mt. / not felt
Pedley, Riverside, California (983.6 km SE of epicenter) [Map] / not felt (reported through our app)
Kamloops, BC (1189.8 km NNE of epicenter) [Map] / Very weak shaking (MMI II) (reported through our app)
Shasta (362.9 km E of epicenter) [Map] / not felt
Tijuana baja California (1133.7 km SE of epicenter) [Map] / Very weak shaking (MMI II) (reported through our app)
near Redway, Humboldt, California (102.4 km ESE of epicenter) [Map] / Weak shaking (MMI III) (reported through our app)
MEDFORD, Oregon (269.8 km NE of epicenter) [Map] / not felt (reported through our app)
huntington park (929 km SE of epicenter) [Map] / Very weak shaking (MMI II) (reported through our app)
Vancouver bc / not felt
Fort Collins, Colorado (1674.5 km E of epicenter) [Map] / Very weak shaking (MMI II) (reported through our app)
Salem, OR (527 km NNE of epicenter) [Map] / not felt (reported through our app)
San Marcos (1066.9 km SE of epicenter) [Map] / not felt (reported through our app)

Aftershocks

[More info]

Recorded aftershocks, latest first (4 quakes)

Date and timeMag
Depth
LocationDetails
Nov 9, 2017 15:58
5 years ago
3.0

28 km
North Pacific Ocean, 44 mi W of Ferndale, Humboldt County, California, USAMore
Nov 7, 2017 02:06
5 years ago
2.8

14 km
North Pacific Ocean, 35 mi SW of Fortuna, Humboldt County, California, USAMore
Oct 31, 2017 21:03
5 years ago
2.7

5 km
North Pacific Ocean, 42 mi W of Ferndale, Humboldt County, California, USAMore
Sep 25, 2017 19:36
5 years ago
3.1

4.6 km
North Pacific Ocean, 38 mi SW of Fortuna, Humboldt County, California, USAMore

Earlier earthquakes in the same area

Try our free app!
Volcanoes & Earthquakes - new app for Android
Android | iOS version

Support us - Help us upgrade our services!

We truly love working to bring you the latest volcano and earthquake data from around the world. Maintaining our website and our free apps does require, however, considerable time and resources.
We need financing to increase hard- and software capacity as well as support our editor team. We're aiming to achieve uninterrupted service wherever an earthquake or volcano eruption unfolds, and your donations can make it happen! Every donation will be highly appreciated. If you find the information useful and would like to support our team in integrating further features, write great content, and in upgrading our soft- and hardware, please make a donation (PayPal or Online credit card payment).

Planned features:
  • Improved multilanguage support
  • Tsunami alerts
  • Faster responsiveness
Thanks to your past donations, these features have been added recently:
  • Design upgrade
  • Detailed quake stats
  • Additional seismic data sources
Download and Upgrade the Volcanoes & Earthquakes app to get one of the fastest seismic and volcano alerts online:
Android | IOS
Thank you!
Sources: VolcanoDiscovery / VolcanoAdventures and other sources as noted.
Use of material: Most text and images on our websites are owned by us. Re-use is generally not permitted without authorization. Contact us for licensing rights.
Volcanoes & Earthquakes
VolcanoDiscovery Home
Volcanoes | Earthquakes | Photos | Volcano News | App
Adventure & Study Travel
Tours to Volcanoes and Volcanic Areas: walking tours, photo tours, study tours
Tours & Dates | FAQ | About us
Get our newsletter!
Company info
Contact | Legal info | Terms & conditions
Follow us
Follow us on facebook Follow us on Instagram Follow us on Twitter Visit our Youtube channel
EN | DE | EL | ES | FR | IT | RU
VolcanoDiscovery GmbH, Germany, Reg. nr.: HRB 103744, EU Tax Id: DE 310 395 322 owned and created by
Dr. Tom Pfeiffer, volcanologist, volcano photographer, tour organizer member of
IAVCEI
Volcanological Society
Ecotourism Greece
Insured by R+V
VolcanoDiscovery © 2004- All Rights Reserved | Privacy - cookie settings