Strong mag. 6.2 earthquake - Philippines Sea, Japan, on Thursday, 21 April 1977 at 01:45 (GMT)
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Strong magnitude 6.2 earthquake at 33 km depth
Date & time: 21 Apr 1977 01:45:50 UTC
Depth: 33.0 km
Epicenter latitude / longitude: 26.861°N / 142.44°E (Philippines Sea, Japan)
Nearest volcano: Kaikata (145 km / 90 mi)
Nearby towns and cities:
32 km (20 mi) SE of Chichijima Island (pop: 2,000) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 1.3 x 1014 joules (35 gigawatt hours, equivalent to 30089 tons of TNT or 1.9 atomic bombs!) 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.
|M 6.2||33 km||Bonin Islands, Japan region||USGS|
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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More infoRecorded aftershocks, latest first (2 quakes):
- 02 Aug 1977 19:54 UTC| M 5.0 |33 km (20.5 mi) depth|70 km (44 mi) distance| USGS | Details
- 21 Apr 1977 17:20 UTC| M 5.2 |27 km (16.8 mi) depth|19 km (12 mi) distance| USGS | Details