Mag. 1.8 earthquake - Offshore Northern California (USA) on Thursday, 20 November 1980 at 02:23 (GMT)

Mag. 1.8 earthquake - Offshore Northern California (USA) on Thursday, 20 November 1980 at 02:23 (GMT)

Minor magnitude 1.8 earthquake at 4 km depth

Date & time: 20 Nov 1980 02:23:42 UTC
Magnitude: 1.8
Depth: 4.3 km
Epicenter latitude / longitude: 40.3995°N / 125.477°W (California, United States)
Nearest volcano: Escanaba Segment (182 km / 113 mi)
Nearby towns and cities:
104 km (65 mi) W of Ferndale (pop: 1,370) --> See nearby quakes!
114 km (71 mi) W of Fortuna (Humboldt County) (pop: 12,000) --> See nearby quakes!
117 km (72 mi) W of Rio Dell (pop: 3,390) --> See nearby quakes!
120 km (74 mi) WSW of Eureka (Humboldt County) (pop: 27,000) --> See nearby quakes!
129 km (80 mi) WSW of Arcata (Humboldt County) (pop: 17,800) --> See nearby quakes!
129 km (80 mi) WSW of Bayside (Humboldt County) (pop: 17,100) --> See nearby quakes!
131 km (81 mi) WSW of McKinleyville (Humboldt County) (pop: 15,200) --> See nearby quakes!
239 km (148 mi) NW of Ukiah (pop: 15,900) --> See nearby quakes!
4099 km (2547 mi) WNW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
4099 km (2547 mi) WNW of Washington DC (District of Columbia) (pop: 601,700) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 3.2 x 107 joules (8.78 kilowatt hours) More info
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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.
MagnitudeDepthLocationSource
M 1.84.3 kmoffshore Northern California (USA)USGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
At magnitude 1.8, this quake was too small to be felt by humans, but it was recorded instrumentally.
There are no user reports for this quake yet. If you felt it be the first to report it!
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Earlier earthquakes in the same area

Mag. 1.8 earthquake - Offshore Northern California (USA) on Thursday, 20 November 1980 at 02:23 (GMT)
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