Strong mag. 5.5 earthquake - 92 km west of Noshiro, Akita, Japan, on Saturday, June 18, 1983 at 22:13 GMT
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Strong magnitude 5.5 earthquake at 21 km depth
1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Earthquake details
| Date & time | Jun 18, 1983 22:13:31 UTC |
| Local time at epicenter | |
| Status | Confirmed |
| Magnitude | 5.5 |
| Depth | 21.3 km |
| Epicenter latitude / longitude | 40.176°N / 138.944°E  (Japan Sea, Japan) |
| Antipode | 40.176°S / 41.056°W |
| Shaking intensity | Moderate shaking near epicenter |
| Felt | 0 reports |
| Primary data source | USGS (United States Geological Survey) |
| Nearest volcano | Megata (71 km / 44 mi) |
| Nearby towns and cities | 92 km (57 mi) W of Noshiro (pop: 51,100) | Show on map | Quakes nearby 92 km (57 mi) WNW of Tennō (Katagami) (pop: 22,700) | Show on map | Quakes nearby 112 km (70 mi) WNW of Akita (pop: 320,100) | Show on map | Quakes nearby 137 km (85 mi) W of Ōdate (pop: 64,500) | Show on map | Quakes nearby 138 km (85 mi) WSW of Hirosaki (pop: 175,000) | Show on map | Quakes nearby 160 km (100 mi) NNW of Sakata (pop: 100,400) | Show on map | Quakes nearby 167 km (104 mi) WSW of Aomori (pop: 298,400) | Show on map | Quakes nearby 195 km (121 mi) WNW of Morioka (pop: 295,200) | Show on map | Quakes nearby 379 km (235 mi) SSW of Sapporo (pop: 1,883,000) | Show on map | Quakes nearby 503 km (313 mi) N of Tokyo (pop: 8,336,600) | Show on map | Quakes nearby |
| Estimated seismic energy released | 1.1 x 1013 joules (3.12 gigawatt hours, equivalent to 2682 tons of TNT or 0.2 atomic bombs!) | about seismic energy |
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.
| Mag. | Depth | Location | Source |
| 5.5 | 21 km | eastern Sea of Japan | USGS |
User reports for this quake
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
Aftershocks
[More info]
Recorded aftershocks, latest first (10 quakes)
Date and time | Mag Depth | Location | Details |
| Jul 25, 1983 23:17 39 years ago | 5.0 33 km | 92 km W of Noshiro, Akita, Japan | More |
| Jul 25, 1983 06:30 39 years ago | 4.5 22 km | 116 km W of Noshiro, Akita, Japan | More |
| Jul 24, 1983 15:36 39 years ago | 4.3 33 km | 90 km W of Noshiro, Akita, Japan | More |
| Jul 22, 1983 12:16 39 years ago | 4.8 33 km | 83 km W of Noshiro, Akita, Japan | More |
| Jul 20, 1983 21:11 39 years ago | 4.7 33 km | 92 km W of Noshiro, Akita, Japan | More |
| Jul 2, 1983 05:32 39 years ago | 5.1 17 km | 99 km W of Noshiro, Akita, Japan | More |
| Jul 1, 1983 23:32 39 years ago | 4.7 33 km | 106 km W of Noshiro, Akita, Japan | More |
| Jun 29, 1983 05:11 39 years ago | 5.0 22 km | 96 km W of Noshiro, Akita, Japan | More |
| Jun 22, 1983 20:15 39 years ago | 5.4 17 km | 94 km W of Noshiro, Akita, Japan | More |
| Jun 19, 1983 04:35 39 years ago | 4.8 31 km | 92 km W of Noshiro, Akita, Japan | More |
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