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Strong mag. 5.7 earthquake - North Pacific Ocean, 31 mi southwest of Fortuna, Humboldt County, California, USA, on Wednesday, January 28, 2015 13:08:53

Strong mag. 5.7 earthquake - North Pacific Ocean, 31 mi southwest of Fortuna, Humboldt County, California, USA, on Wednesday, January 28, 2015 13:08:53 Strong mag. 5.7 earthquake - North Pacific Ocean, 31 mi southwest of Fortuna, Humboldt County, California, USA, on Wednesday, January 28, 2015 13:08:53

Strong magnitude 5.7 earthquake at 17 km depth

28 Jan 21:13 UTC: First to report: USGS after 4 minutes.
Hypocenter depth recalculated from 17.1 to 17.2 km.

Earthquake details

Date & timeJan 28, 2015 21:08:53 UTC
Local time at epicenterWednesday, January 28, 2015 13:08:53
StatusConfirmed
Magnitude5.7
Depth17.2 km
Epicenter latitude / longitude40.3178°N / 124.6067°W (North Pacific Ocean, California, United States)
Antipode40.318°S / 55.393°E
Shaking intensityModerate shaking
Felt6 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoClear Lake (218 km / 135 mi)
Nearby towns and cities41 km (25 mi) SW of Ferndale (pop: 1,370) | Show on map | Quakes nearby
47 km (29 mi) WSW of Rio Dell (pop: 3,390) | Show on map | Quakes nearby
49 km (31 mi) SW of Fortuna (Humboldt County) (pop: 12,000) | Show on map | Quakes nearby
66 km (41 mi) SW of Eureka (Humboldt County) (pop: 27,000) | Show on map | Quakes nearby
70 km (44 mi) WNW of Redway (pop: 1,230) | Show on map | Quakes nearby
74 km (46 mi) SW of Bayside (Humboldt County) (pop: 17,100) | Show on map | Quakes nearby
75 km (47 mi) SW of Arcata (Humboldt County) (pop: 17,800) | Show on map | Quakes nearby
82 km (51 mi) SSW of McKinleyville (Humboldt County) (pop: 15,200) | Show on map | Quakes nearby
190 km (118 mi) W of Redding (pop: 91,600) | Show on map | Quakes nearby
250 km (155 mi) NW of Windsor (Sonoma County) (pop: 27,500) | Show on map | Quakes nearby
Estimated seismic energy released2.2 x 1013 joules (6.22 gigawatt hours, equivalent to 5351 tons of TNT or 0.3 atomic bombs!) | 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
5.717 km40km SW of Ferndale, CaliforniaUSGS
5.710 km OFFSHORE NORTHERN CALIFORNIAEMSC
5.710 kmNear Coast of N. CaliforniaGFZ

Seismograms

Seismic station: Columbia College, Columbia, CA, USA (CMB/BK network) | Distance from quake: 444 km / 276 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 (9)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Translate
Redding / Light shaking (MMI IV)
Chico,ca / Very weak shaking (MMI II)
1000 king salmon Ave Eureka, Ca. / Light shaking (MMI IV) : lasted about 15 to 2 sec initially stronger than tapered off.  
willits, ca / Weak shaking (MMI III) : Felt slow roll over 5 seconds.  
Ferndale / Strong shaking (MMI VI) : Fairly significant shaking in Ferndale. Couple of items broken due to falling from shelves.   
Mendocino, Ca / Light shaking (MMI IV)
Trinity Center (United States, 197 km NE of epicenter) : I was standing in my bedroom and I could feel tremors through the floor and the lights were ever so slightly shaking. Lasted between 5-8 seconds. (reported through EMSC)  
Fort Bragg (United States, 119 km SE of epicenter) : the rattling lasted about 6-8 seconds (reported through EMSC)  
Redway (United States, 70 km E of epicenter) : I felt two shocks from this uake (reported through EMSC)  

Aftershocks

[More info]

Recorded aftershocks, latest first (43 quakes)

Date and timeMag
Depth
LocationDetails
Mar 28, 2015 11:58
8 years ago
2.2

13 km
29km S of Rio Dell, CaliforniaMore
Mar 25, 2015 14:53
8 years ago
2.7

23 km
North Pacific Ocean, 14 mi SW of Fortuna, Humboldt County, California, USAMore
Mar 24, 2015 21:31
8 years ago
2.0

20 km
18km SW of Ferndale, CaliforniaMore
Mar 24, 2015 17:19
8 years ago
2.2

19 km
18km SW of Ferndale, CaliforniaMore
Mar 19, 2015 22:44
8 years ago
2.1

24 km
17km SW of Ferndale, CaliforniaMore
Mar 19, 2015 02:10
8 years ago
3.1

19 km
North Pacific Ocean, 28 mi W of Fortuna, Humboldt County, California, USAMore
Mar 16, 2015 07:19
8 years ago
2.5

20 km
North Pacific Ocean, 41 mi SW of Eureka, Humboldt County, California, USAMore
Mar 15, 2015 04:20
8 years ago
2.7

0.6 km
North Pacific Ocean, 40 mi W of Eureka, Humboldt County, California, USAMore
Mar 10, 2015 07:06
8 years ago - felt
3.8

14 km
North Pacific Ocean, 32 mi SW of Fortuna, Humboldt County, California, USAMore
Feb 23, 2015 02:16
8 years ago
2.1

12 km
27km S of Rio Dell, CaliforniaMore
Feb 16, 2015 15:50
8 years ago
2.1

9.7 km
34km SSW of Ferndale, CaliforniaMore
Feb 16, 2015 11:17
8 years ago
2.4

24 km
North Pacific Ocean, 27 mi W of Eureka, Humboldt County, California, USAMore
Feb 10, 2015 18:10
8 years ago
2.8

18 km
North Pacific Ocean, 40 mi SW of Eureka, Humboldt County, California, USAMore
Feb 10, 2015 09:15
8 years ago
2.6

15 km
42km WSW of Ferndale, CaliforniaMore
Feb 8, 2015 17:57
8 years ago
2.1

24 km
10km S of Ferndale, CaliforniaMore
Feb 8, 2015 13:34
8 years ago
2.3

20 km
35km SW of Rio Dell, CaliforniaMore
Feb 3, 2015 08:30
8 years ago
2.1

20 km
32km SW of Rio Dell, CaliforniaMore
Feb 2, 2015 03:01
8 years ago
3.0

18 km
North Pacific Ocean, 29 mi SW of Fortuna, Humboldt County, California, USAMore
Feb 1, 2015 13:04
8 years ago
2.7

21 km
North Pacific Ocean, 38 mi S of Eureka, Humboldt County, California, USAMore
Jan 31, 2015 01:19
8 years ago
3.0

20 km
North Pacific Ocean, 25 mi SW of Fortuna, Humboldt County, California, USAMore
Jan 30, 2015 16:55
8 years ago
2.4

25 km
22km SW of Rio Dell, CaliforniaMore
Jan 29, 2015 19:49
8 years ago
2.1

21 km
41km SW of Ferndale, CaliforniaMore
Jan 29, 2015 19:47
8 years ago
3.0

20 km
North Pacific Ocean, 30 mi SW of Fortuna, Humboldt County, California, USAMore
Jan 29, 2015 19:13
8 years ago
4.3

18 km
North Pacific Ocean, 30 mi SW of Fortuna, Humboldt County, California, USAMore
Jan 29, 2015 17:27
8 years ago
2.4

22 km
38 mi S of Eureka, Humboldt County, California, USAMore
Jan 29, 2015 13:12
8 years ago
2.5

20 km
36km SSW of Ferndale, CaliforniaMore
Jan 29, 2015 08:06
8 years ago
2.7

21 km
38 mi S of Eureka, Humboldt County, California, USAMore
Jan 29, 2015 06:06
8 years ago
2.4

13 km
44km SW of Ferndale, CaliforniaMore
Jan 29, 2015 03:14
8 years ago
2.0

21 km
31km SW of Rio Dell, CaliforniaMore
Jan 29, 2015 01:53
8 years ago
2.7

24 km
38 mi S of Eureka, Humboldt County, California, USAMore
Jan 28, 2015 23:28
8 years ago
2.0

21 km
31km SW of Rio Dell, CaliforniaMore
Jan 28, 2015 23:20
8 years ago
2.2

10.7 km
28km S of Rio Dell, CaliforniaMore
Jan 28, 2015 22:34
8 years ago - felt
2.9

32 km
33 mi S of Eureka, Humboldt County, California, USAMore
Jan 28, 2015 22:27
8 years ago
2.1

19 km
44km SW of Ferndale, CaliforniaMore
Jan 28, 2015 22:21
8 years ago
2.2

21 km
34km SW of Rio Dell, CaliforniaMore
Jan 28, 2015 22:08
8 years ago
2.5

19 km
39km SW of Ferndale, CaliforniaMore
Jan 28, 2015 21:46
8 years ago
2.2

21 km
37km SW of Ferndale, CaliforniaMore
Jan 28, 2015 21:45
8 years ago
2.3

21 km
North Pacific Ocean, 38 mi S of Eureka, Humboldt County, California, USAMore
Jan 28, 2015 21:24
8 years ago
2.7

14 km
North Pacific Ocean, 42 mi SW of Eureka, Humboldt County, California, USAMore
Jan 28, 2015 21:23
8 years ago
2.4

22 km
31km SW of Rio Dell, CaliforniaMore
Jan 28, 2015 21:18
8 years ago
2.2

21 km
34km SW of Rio Dell, CaliforniaMore
Jan 28, 2015 21:15
8 years ago
3.0

21 km
North Pacific Ocean, 26 mi SW of Fortuna, Humboldt County, California, USAMore
Jan 28, 2015 21:11
8 years ago
3.1

22 km
North Pacific Ocean, 24 mi SW of Fortuna, Humboldt County, California, USAMore

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