1994 offshore Sanriku earthquake
The 1994 offshore Sanriku earthquake (Japanese: 三陸はるか沖地震 Sanriku Haruka Okijishin) occurred on December 28, 1994, at 12:19 UTC (21:19 local time). This was a magnitude Mw 7.7 earthquake with epicenter located in the Pacific Ocean at about 180 km east of Hachinohe, Aomori (haruka-oki means "far offshore"). The intensity reached shindo 6 in Hachinohe, Aomori, about 187.6 km from epicenter. It could be felt in Tokyo, about 632.9 km from epicenter, with shindo 2. The Japanese Meteorological Agency put the magnitude at MJMA 7.5. Slip associated with this earthquake continued for more than a year and it has been termed an 'ultra-slow earthquake'.
JMA seismic intensity map | |
| UTC time | 1994-12-28 12:19:23 |
|---|---|
| ISC event | 137333 |
| USGS-ANSS | ComCat |
| Local date | December 28, 1994 |
| Local time | 21:19 |
| Magnitude | 7.7 Mw 7.5 MJMA |
| Depth | 33 km |
| Epicenter | 40.451°N 143.491°E |
| Areas affected | Japan |
| Max. intensity | MMI IX (Violent) JMA 6+ |
| Peak acceleration | 0.69 g 673.5 Gal |
| Tsunami | 55 cm |
| Casualties | 3 killed, 788 injured |
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