Strong mag. 5.4 earthquake - 94 km west of Noshiro, Akita, Japan, on Wednesday, June 22, 1983 at 20:15 GMT
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Strong magnitude 5.4 earthquake at 17 km depth
1 Jan 00:00 UTC: First to report: USGS after 30 seconds.
Earthquake details
| Date & time | Jun 22, 1983 20:15:46 UTC |
| Local time at epicenter | |
| Status | Confirmed |
| Magnitude | 5.4 |
| Depth | 17.2 km |
| Epicenter latitude / longitude | 40.093°N / 138.931°E  (Japan Sea, Japan) |
| Antipode | 40.093°S / 41.069°W |
| Shaking intensity | Moderate shaking near epicenter |
| Felt | 0 reports |
| Primary data source | USGS (United States Geological Survey) |
| Nearest volcano | Megata (70 km / 43 mi) |
| Nearby towns and cities | 91 km (56 mi) WNW of Tennō (Katagami) (pop: 22,700) | Show on map | Quakes nearby 94 km (58 mi) W of Noshiro (pop: 51,100) | Show on map | Quakes nearby 109 km (68 mi) WNW of Akita (pop: 320,100) | Show on map | Quakes nearby 140 km (87 mi) W of Ōdate (pop: 64,500) | Show on map | Quakes nearby 142 km (88 mi) WSW of Hirosaki (pop: 175,000) | Show on map | Quakes nearby 153 km (95 mi) NNW of Sakata (pop: 100,400) | Show on map | Quakes nearby 172 km (107 mi) WSW of Aomori (pop: 298,400) | Show on map | Quakes nearby 194 km (121 mi) WNW of Morioka (pop: 295,200) | Show on map | Quakes nearby 387 km (241 mi) SSW of Sapporo (pop: 1,883,000) | Show on map | Quakes nearby 494 km (307 mi) N of Tokyo (pop: 8,336,600) | Show on map | Quakes nearby |
| Estimated seismic energy released | 7.9 x 1012 joules (2.21 gigawatt hours, equivalent to 1898 tons of TNT or 0.1 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 |
| 5.4 | 17 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 (8 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 |
Earlier earthquakes in the same area
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