Strong mag. 6.5 earthquake - Hokkaido, Japan Region, on Saturday, 30 April 1983 at 14:03 (GMT)
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Strong magnitude 6.5 earthquake at 30 km depth
Magnitude: 6.5
Depth: 30.4 km
Epicenter latitude / longitude: 41.473°N / 143.764°E

Nearest volcano: Shikaribetsu Group (207 km / 129 mi)
Nearby towns and cities:
150 km (93 mi) SE of Shizunai-furukawachō (pop: 22,400) --> See nearby quakes!
167 km (104 mi) SSE of Obihiro (pop: 173,900) --> See nearby quakes!
174 km (108 mi) SSW of Kushiro (pop: 183,600) --> See nearby quakes!
175 km (109 mi) SSE of Otofuke (pop: 40,900) --> See nearby quakes!
214 km (133 mi) E of Mutsu (pop: 49,200) --> See nearby quakes!
219 km (136 mi) ENE of Hachinohe (pop: 239,000) --> See nearby quakes!
220 km (137 mi) SE of Tomakomai (pop: 174,800) --> See nearby quakes!
230 km (143 mi) SE of Chitose (pop: 92,900) --> See nearby quakes!
266 km (165 mi) SE of Sapporo (pop: 1,883,000) --> See nearby quakes!
734 km (456 mi) NNE of Tokyo (pop: 8,336,600) --> See nearby quakes!
Primary data source: USGS (United States Geological Survey)
Estimated released energy: 3.5 x 1014 joules (98.6 gigawatt hours, equivalent to 84802 tons of TNT or 5.3 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.
Magnitude | Depth | Location | Source |
M 6.5 | 30 km | Hokkaido, 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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There are no user reports for this quake yet. If you felt it Aftershocks of the 6.5 quake Hokkaido, Japan Region, 30 April 1983 14:03 GMT
More info
Recorded aftershocks, latest first (8 quakes):- 13 Oct 1983 10:01 UTC| M 5.5 |29.8 km (18.5 mi) depth|58 km (36 mi) distance| USGS | Details
- 11 May 1983 16:59 UTC| M 4.5 |86.6 km (53.8 mi) depth|74 km (46 mi) distance| USGS | Details
- 01 May 1983 18:55 UTC| M 4.5 |59.8 km (37.2 mi) depth|8 km (5 mi) distance| USGS | Details
- 01 May 1983 07:13 UTC| M 5.0 |47.6 km (29.6 mi) depth|20 km (12 mi) distance| USGS | Details
- 30 Apr 1983 23:59 UTC| M 4.7 |68 km (42.3 mi) depth|20 km (12 mi) distance| USGS | Details
- 30 Apr 1983 20:17 UTC| M 4.6 |45.4 km (28.2 mi) depth|21 km (13 mi) distance| USGS | Details
- 30 Apr 1983 15:57 UTC| M 5.1 |51.3 km (31.9 mi) depth|6 km (4 mi) distance| USGS | Details
- 30 Apr 1983 15:50 UTC| M 4.5 |69.5 km (43.2 mi) depth|16 km (10 mi) distance| USGS | Details
Earlier earthquakes in the same area
Strong mag. 6.5 earthquake - Hokkaido, Japan Region, on Saturday, 30 April 1983 at 14:03 (GMT)Click here to search our database for earlier earthquakes in the same area since 1900!