Strong mag. 6.5 earthquake - Hokkaido, Japan Region, on Saturday, 30 April 1983 at 14:03 (GMT)

Strong mag. 6.5 earthquake - Hokkaido, Japan Region, on Saturday, 30 April 1983 at 14:03 (GMT)

Strong magnitude 6.5 earthquake at 30 km depth

Date & time: 30 Apr 1983 14:03:49 UTC
Magnitude: 6.5
Depth: 30.4 km
Epicenter latitude / longitude: 41.473°N / 143.764°E (Japan)
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
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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.
MagnitudeDepthLocationSource
M 6.530 kmHokkaido, Japan regionUSGS
Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake yet. If you felt it be the first to report it!
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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

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Earlier earthquakes in the same area

Strong mag. 6.5 earthquake - Hokkaido, Japan Region, on Saturday, 30 April 1983 at 14:03 (GMT)
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