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Moderate mag. 5.2 earthquake - North Pacific Ocean, 23 mi southwest of Fortuna, Humboldt County, California, USA, on 2020-03-18 14:08:20 -08:00

Moderate mag. 5.2 earthquake - North Pacific Ocean, 23 mi southwest of Fortuna, Humboldt County, California, USA, on 2020-03-18 14:08:20 -08:00 Moderate mag. 5.2 earthquake - North Pacific Ocean, 23 mi southwest of Fortuna, Humboldt County, California, USA, on 2020-03-18 14:08:20 -08:00

Moderate magnitude 5.2 earthquake at 29 km depth

18 Mar 22:13 UTC: First to report: USGS after 5 minutes.
Mar 18 22:14: Magnitude recalculated from 5.0 to 5.2.

Earthquake details

Date & timeMar 18, 2020 22:08:20 UTC
Local time at epicenter2020-03-18 14:08:20 -08:00
StatusConfirmed
Magnitude5.2
Depth28.6 km
Epicenter latitude / longitude40.3475°N / 124.45617°W (North Pacific Ocean, United States)
Antipode40.348°S / 55.544°E
Shaking intensityModerate shaking
Felt47 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoBlack Butte (207 km / 129 mi)
Nearby towns and cities30 km (19 mi) SSW of Ferndale (pop: 1,370) | Show on map | Quakes nearby
34 km (21 mi) WSW of Rio Dell (pop: 3,390) | Show on map | Quakes nearby
38 km (23 mi) SW of Fortuna (Humboldt County) (pop: 12,000) | Show on map | Quakes nearby
56 km (35 mi) SSW of Eureka (Humboldt County) (pop: 27,000) | Show on map | Quakes nearby
59 km (37 mi) WNW of Redway (pop: 1,230) | Show on map | Quakes nearby
64 km (40 mi) SSW of Bayside (Humboldt County) (pop: 17,100) | Show on map | Quakes nearby
66 km (41 mi) SSW of Arcata (Humboldt County) (pop: 17,800) | Show on map | Quakes nearby
73 km (45 mi) SSW of McKinleyville (Humboldt County) (pop: 15,200) | Show on map | Quakes nearby
177 km (110 mi) W of Redding (pop: 91,600) | Show on map | Quakes nearby
245 km (152 mi) NW of Windsor (Sonoma County) (pop: 27,500) | Show on map | Quakes nearby
Estimated seismic energy released4 x 1012 joules (1.11 gigawatt hours, equivalent to 951 tons of TNT) | about seismic energy
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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
5.224 kmOffshore Northern California (USA)EMSC
5.229 km15km W of Petrolia, CA (USA)USGS
5.210 kmNear Coast of N. California (USA)GFZ
5.043 kmNear Coast of N. California (USA)GeoAu

Seismograms

Seismic station: Columbia College, Columbia, CA, USA (CMB/BK network) | Distance from quake: 435 km / 270 mi | Show on map | Station Info
Seismic station Columbia College, Columbia, CA, 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 (63)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Eureka CA / Moderate shaking (MMI V)
west jordan / Moderate shaking (MMI V) : i felt 2 earthquakes on March 18,2020  
Cleone, California (110.9 km SSE of epicenter) [Map] / Light shaking (MMI IV) : it rolled twice  
Anderson ca (183.4 km E of epicenter) [Map] / Weak shaking (MMI III) : Was sitting in my recliner when i felt it shaking... checked my app and sure enough (reported through our app)  
Anderson ca (183.4 km E of epicenter) [Map] / Weak shaking (MMI III) : Felt my recliner moving while sitting ...checked my app sure enough... (reported through our app)  
Eureka, CA / Moderate shaking (MMI V)
West Valley City, Salt Lake, Utah (1048.6 km E of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
Loleta, CA (27.4 km NE of epicenter) [Map] / Moderate shaking (MMI V) : No damage to our home or items in the home  
Canoga Park, Los Angeles, California (857.2 km SE of epicenter) [Map] / Moderate shaking (MMI V) (reported through our app)
Pahrump NV / Very weak shaking (MMI II)
Cutten / Strong shaking (MMI VI) : Sudden strong jolt, Cats ran outside, everything was moving -- I was on a webinar and watched myself shaking because of my chair!  
Arcata / Moderate shaking (MMI V)
Bayside (84.7 km NNE of epicenter) [Map] / Moderate shaking (MMI V) : shaking no damage. watched the deck shake...its not hinged to house. Animls were very aware.  
Eureka / Moderate shaking (MMI V) : Strong shaking. Bookshelves and pictures swaying. Floor lamps rocked back-and-forth. Lasted about 25 seconds with two shocks during that period of time. Lighter quick followed about 10 minutes later.  
Grants Pass Oregon / Light shaking (MMI IV)
Fortuna (36.1 km NE of epicenter) [Map] / Strong shaking (MMI VI) : Was surprised by magnitude, 5.2 as felt much stronger. 1st time my phone signaled an Earthquake Alarm, it sounded during the last moments of the shaking.  
Eureka / Strong shaking (MMI VI)
Fortuna (34 km NE of epicenter) [Map] / Strong shaking (MMI VI) : Felt light rolling, then heard it and then 3 large shakes followed by lesser rolling. Animals were running and most hanging item in house swayed, nothing toppled over. No damage observed, but heard cracking in house.  
Eureka, CA / Moderate shaking (MMI V) : Either really strong, or really close.  
Fortuna, California / Strong shaking (MMI VI) : Fortuna, California, In my 2nd story apartment things on the wall almost fell to the floor  
Eureka / Moderate shaking (MMI V) : Strong jolt, then rocking and swaying.  
Arcata, CA 95521 / Light shaking (MMI IV) : There was a low rumble feeling/sound and our 2 story home shook and then a larger shake occurred seconds later.  
Arcata / Very strong shaking (MMI VII)
Mendocino, Ca the House shook / Very strong shaking (MMI VII)
Eureka, Humboldt, California (54.5 km NNE of epicenter) [Map] / Moderate shaking (MMI V) : Felt strong jolting. Knocked A few smaller items off of bookcase and scared the cats.  
Las Vegas, NV / Very weak shaking (MMI II)
Arcata, ca / Very strong shaking (MMI VII) : Short, sudden but very strong. Jolting. Nothing fell down but it was strong.  
King salmon neat Eureka (47.1 km NNE of epicenter) [Map] / Light shaking (MMI IV) : Sharp jolt, some shaking, short lived (reported through our app)  
Grants Pass, OR / Light shaking (MMI IV) : Bouncing feeling for just a few seconds/Grants Pass Oregon  
Blue Lake / Strong shaking (MMI VI)
Willow Creek, Humboldt, California (90 km NE of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
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Aftershocks

[More info]

Recorded aftershocks, latest first (24 quakes)

Date and timeMag
Depth
LocationDetails
May 16, 2020 23:07
2 years ago
2.5

22 km
North Pacific Ocean, 17 mi SW of Ferndale, Humboldt County, California, USAMore
May 8, 2020 14:19
2 years ago
2.4

17 km
17 mi S of Ferndale, Humboldt County, California, USAMore
May 8, 2020 11:57
2 years ago
2.0

20 km
North Pacific Ocean, 30 mi SW of Fortuna, Humboldt County, California, USAMore
May 4, 2020 08:24
2 years ago
2.3

7.4 km
North Pacific Ocean, 17 mi S of Ferndale, Humboldt County, California, USAMore
May 4, 2020 08:13
2 years ago
2.6

5.3 km
North Pacific Ocean, 17 mi S of Ferndale, Humboldt County, California, USAMore
May 3, 2020 13:12
2 years ago
3.4

10 km
North Pacific Ocean, 25 mi SW of Fortuna, Humboldt County, California, USAMore
May 3, 2020 11:43
2 years ago
2.1

9.2 km
North Pacific Ocean, 18 mi S of Ferndale, Humboldt County, California, USAMore
Apr 29, 2020 03:48
2 years ago
2.1

22 km
North Pacific Ocean, 10.4 mi SW of Ferndale, Humboldt County, California, USAMore
Apr 23, 2020 15:31
2 years ago
2.3

20 km
North Pacific Ocean, 27 mi SW of Fortuna, Humboldt County, California, USAMore
Apr 21, 2020 22:37
2 years ago
2.7

22 km
North Pacific Ocean, 29 mi SW of Fortuna, Humboldt County, California, USAMore
Apr 20, 2020 21:58
2 years ago
2.0

10.6 km
17 mi S of Ferndale, Humboldt County, California, USAMore
Apr 19, 2020 15:41
2 years ago
2.6

22 km
North Pacific Ocean, 25 mi SW of Fortuna, Humboldt County, California, USAMore
Apr 18, 2020 04:32
2 years ago
2.9

16 km
North Pacific Ocean, 14 mi SW of Ferndale, Humboldt County, California, USAMore
Apr 10, 2020 20:36
2 years ago
2.1

21 km
North Pacific Ocean, 27 mi SW of Fortuna, Humboldt County, California, USAMore
Apr 7, 2020 10:13
2 years ago
2.1

17 km
17 mi SW of Fortuna, Humboldt County, California, USAMore
Apr 6, 2020 08:26
3 years ago
2.3

21 km
North Pacific Ocean, 28 mi SW of Fortuna, Humboldt County, California, USAMore
Mar 23, 2020 10:07
3 years ago
3.5

16 km
North Pacific Ocean, 34 mi SW of Fortuna, Humboldt County, California, USAMore
Mar 20, 2020 14:42
3 years ago
2.1

25 km
12 mi SW of Fortuna, Humboldt County, California, USAMore
Mar 20, 2020 00:26
3 years ago
2.0

20 km
North Pacific Ocean, 26 mi SW of Fortuna, Humboldt County, California, USAMore
Mar 19, 2020 15:29
3 years ago
2.0

21 km
North Pacific Ocean, 15 mi S of Ferndale, Humboldt County, California, USAMore
Mar 19, 2020 05:35
3 years ago
2.3

21 km
North Pacific Ocean, 30 mi SW of Fortuna, Humboldt County, California, USAMore
Mar 19, 2020 02:51
3 years ago
2.4

22 km
North Pacific Ocean, 17 mi SW of Ferndale, Humboldt County, California, USAMore
Mar 19, 2020 00:36
3 years ago
2.0

20 km
North Pacific Ocean, 18 mi S of Ferndale, Humboldt County, California, USAMore
Mar 18, 2020 23:17
3 years ago
2.3

21 km
North Pacific Ocean, 26 mi SW of Fortuna, Humboldt County, California, USAMore

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