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Major magnitude 7.1 earthquake - Philippines Sea, Japan, on Wednesday, 27 May 1970 at 12:05 (GMT)
Major magnitude 7.1 earthquake at 390 km depth
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Date & time: 27 May 1970 12:05:07 UTC
Magnitude: 7.1Depth: 390.0 km
Epicenter latitude / longitude: 27.236°N / 140.23°E
(
Philippines Sea,
Japan)
Nearest volcano:
Nishino-shima (65 km / 40 mi)
Nearby towns and cities:942 km (585 mi) S of Tokyo (pop: 8,336,600) -->
See nearby quakes!Primary data source:
USGS (United States Geological Survey)
Estimated released energy: 2.8 x 10
15 joules (783 gigawatt hours, equivalent to 6.7 x 10
5 tons of TNT or 42.1 atomic bombs!)
More info[show map]
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Data for the same earthquake reported by different agencies
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| Magnitude | Depth | Location | Source |
| M 7.1 | 390 km | Bonin Islands, Japan region | USGS |
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.
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Aftershocks
More info
Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. 1259 km
2 (=486 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 61 km (38 mi).
Aftershocks typically occur during the weeks, months or even a year following the quake at or near the same fault, at distances of up to approx. two times the length of the rupture zone.
The often broadly linear arrangement of aftershock epicenters encompasses the rupture zone of the main shock (check on the
map below to verify).
14 May 1971 09:57 UTC
| M 5.6 | 25 km (15.5 mi) depth
| 190 km (118 mi) distance
| USGS | Details
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