 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°27′04″N 143°29′28″E / 40.451°N 143.491°E |
| Areas affected | Japan |
| Max. intensity | MMI IX (Violent)[1] JMA 6+ |
| Peak acceleration | 0.69 g 673.5 Gal |
| Tsunami | 55 cm |
| Casualties | 3 killed, 788 injured |
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").[2][3] 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.[4] The Japanese Meteorological Agency put the magnitude at MJMA 7.5.[5] Slip associated with this earthquake continued for more than a year and it has been termed an 'ultra-slow earthquake'.[6]
- ^ National Geophysical Data Center / World Data Service (NGDC/WDS) (1972). "Significant Earthquake Database" (Data Set). National Geophysical Data Center, NOAA. doi:10.7289/V5TD9V7K.
- ^ USGS (5 January 2010). "Significant Earthquakes of the World 1994". Archived from the original on 2011-07-14. Retrieved 13 July 2011.
- ^ Disaster Prevention Aomori Prefecture. "Summary of earthquake" (in Japanese). Archived from the original on 2012-01-31. Retrieved 13 July 2011.
- ^ "強震波形（三陸沖）" (in Japanese). Archived from the original on 2011-09-28. Retrieved 2011-08-09.
- ^ Sato, Y.; Ichii K.; Miyata M. Morita T. & Iai S (1997). "Strong-motion earthquake records on the 1994 Sanriku-Haruka-Oki earthquake in port areas" (PDF). Technical Note of the Port and Harbour Research Institute, Ministry of Transport, Japan. 892: 5. Archived from the original (PDF) on 26 March 2012. Retrieved 13 July 2011.
- ^ Cite error: The named reference
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