Strong mag. 5.4 earthquake - Ryer Island, 1.3 mi southwest of Concord, Contra Costa County, California, USA, on Monday, October 24, 1955 at 04:10 (GMT)
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Strong magnitude 5.4 earthquake at 0 km depth
Depth: 0.0 km
Epicenter latitude / longitude: 37.967°N / 122.05°W (Contra Costa County, California, United States)
Antipode: 37.967°S / 57.95°E
Nearest volcano: Clear Lake (128 km / 80 mi)
Nearby towns and cities:
2 km (1 mi) SW of Concord (pop: 128,700) --> See nearby quakes!
2 km (1 mi) NNE of Pleasant Hill (pop: 34,800) --> See nearby quakes!
7 km (4 mi) N of Walnut Creek (pop: 68,900) --> See nearby quakes!
9 km (6 mi) SE of Martinez (pop: 38,100) --> See nearby quakes!
16 km (10 mi) WSW of New York of the Pacific (pop: 69,400) --> See nearby quakes!
22 km (14 mi) WSW of Antioch (pop: 110,500) --> See nearby quakes!
22 km (14 mi) ENE of Berkeley (pop: 121,000) --> See nearby quakes!
39 km (24 mi) NE of San Francisco (pop: 864,800) --> See nearby quakes!
71 km (44 mi) NNW of San Jose (pop: 1,026,900) --> See nearby quakes!
84 km (52 mi) SW of Sacramento (pop: 490,700) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 7.9 x 1012 joules (2.21 gigawatt hours, equivalent to 1898 tons of TNT or 0.1 atomic bombs!) | about seismic energy
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.
|5.4||0 km||San Francisco Bay area, California (USA)||USGS|
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Recorded aftershocks, latest first (0 quake)
So far, no aftershocks have been registered.