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Moderate mag. 5.0 earthquake - North Pacific Ocean, Japan, on Monday, 6 April 1998 at 05:28 (GMT)
Moderate magnitude 5.0 earthquake at 36 km depth
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Date & time: 6 Apr 1998 05:28:52 UTC
Magnitude: 5Depth: 36.4 km
Epicenter latitude / longitude: 27.929°N / 143.529°E
(
North Pacific Ocean,
Japan)
Nearest volcano:
unnamed (221 km / 137 mi)
Nearby towns and cities:936 km (582 mi) SSE of Tokyo (pop: 8,336,600) -->
See nearby quakes!Primary data source:
USGS (United States Geological Survey)
Estimated released energy: 2 x 10
12 joules (554 megawatt hours, equivalent to 477 tons of TNT)
More info[show map]
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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.
| Magnitude | Depth | Location | Source |
| M 5.0 | 36 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. 10 km
2 (=4 sqare miles) as a first-order estimate. The length of the rupture zone thus was probably around 5 km (3 mi).
Aftershocks typically occur during the days and weeks 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).
08 Apr 1998 10:50 UTC
| M 4.0 | 33 km (20.5 mi) depth
| 15 km (9 mi) distance
| USGS | Details08 Apr 1998 08:52 UTC
| M 3.8 | 33 km (20.5 mi) depth
| 7 km (5 mi) distance
| USGS | Details08 Apr 1998 07:34 UTC
| M 3.9 | 33 km (20.5 mi) depth
| 9 km (6 mi) distance
| USGS | Details07 Apr 1998 01:35 UTC
| M 4.2 | 33 km (20.5 mi) depth
| 6 km (4 mi) distance
| USGS | Details06 Apr 1998 07:45 UTC
| M 4.1 | 10 km (6.2 mi) depth
| 5 km (3 mi) distance
| USGS | Details
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