Minor mag. 0.5 earthquake - 20 Km E of Castle Rock, Washington, USA, on Thursday, 8 April 2021 at 23:42 (GMT) -
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Minor magnitude 0.5 earthquake at 18 km depth
9 Apr 17:50 UTC: First to report: USGS after 18 hours.
Date & time: 8 Apr 2021 23:42:58 UTC -
Depth: 17.8 km
Epicenter latitude / longitude: 46.2655°N / 122.64133°W (Washington, United States)
Nearest volcano: Mount St. Helens (36 km / 22 mi)
Nearby towns and cities:
21 km (13 mi) E of Castle Rock (pop: 2,180) --> See nearby quakes!
24 km (15 mi) ENE of Kelso (Cowlitz County) (pop: 11,900) --> See nearby quakes!
27 km (17 mi) ENE of Longview (Cowlitz County) (pop: 36,800) --> See nearby quakes!
70 km (43 mi) N of Vancouver (pop: 172,900) --> See nearby quakes!
83 km (51 mi) N of Portland (Oregon) (pop: 632,300) --> See nearby quakes!
87 km (54 mi) N of Gresham (Oregon) (pop: 110,600) --> See nearby quakes!
87 km (54 mi) NNE of Hillsboro (Oregon) (pop: 102,300) --> See nearby quakes!
87 km (54 mi) N of Beaverton (Oregon) (pop: 96,600) --> See nearby quakes!
88 km (54 mi) N of Aloha (Oregon) (pop: 49,400) --> See nearby quakes!
88 km (55 mi) SSE of Olympia (pop: 50,300) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 3.5 x 105 joules (0.099 kilowatt hours) More info
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.
|0.5||18 km||20 Km E of Castle Rock, Washington, USA||USGS|
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.At magnitude 0.5, such a quake wouldn't normally be felt by people, but could be recorded instrumentally.