The 2012 Sanriku earthquake (三陸沖地震, Sanriku oki jishin) occurred near the city of Kamaishi, Japan, on December 7 at 17:18 JST.[9] The magnitude 7.3 shock generated a small tsunami, with waves up to 1 m high, that hit Ishinomaki in Miyagi Prefecture.[10] It occurred at a depth of 36 km within the Pacific plate and was the result of reverse faulting, about 20 kilometres (12 mi) east of the Japan Trench.
| 三陸沖地震 | |
 | |
  | |
| UTC time | 2012-12-07 08:18:23 |
|---|---|
| ISC event | 607215270 |
| USGS-ANSS | ComCat |
| Local date | December 7, 2012 |
| Local time | 17:18 |
| Duration | about 1 minute[1] |
| Magnitude | 7.3 Mw |
| Depth | 36.1 km (22 mi) |
| Epicenter | 37°53′20″N 144°05′24″E / 37.889°N 144.090°E |
| Areas affected | Japan |
| Max. intensity | MMI V (Moderate) JMA 5− |
| Tsunami | 1.0 m (3.3 ft) in Ishinomaki, Miyagi |
| Casualties | 3 dead, 14 injured[2][3][4][5][6][7][8] |
Damage
editTsunami
editThe 1 metre (3.3 ft) tsunami caused a mountain of sandbags to collapse in Ishinomaki.[7] An old man went missing and was found dead on December 14 after he sailed out to sea to try to evacuate from the tsunami in Kuji.[6][7]
Shaking
editSome pipeworks were damaged in an old people's facility in Saitama.[1] Some boards in a roof of an elementary school in Ichikai shifted.[11] An elderly lady died of shock at her home in Marumori, and a man died of shock after trying to evacuate from where he was working in Iitate, causing a total of 3 deaths.[6] This earthquake also caused 14 injuries.[7]
Previous earthquakes in Kamaishi
editIn 2001 and 2008, there were a series of micro earthquakes that could have started the tectonic plate movement that triggered the 2012 Kamaishi earthquake. These small series of earthquakes were a magnitude of about 3–4.9. According to studies, the shocks moved from the outer and deeper limits into the mainshock epicenter. These small earthquakes were a precursor that began the tectonic movement for the 2012 earthquake.[12]
See also
editReferences
edit- ^ a b "三陸沖地震 埼玉県内も震度4 女性1人けが". 産経新聞. 8 December 2012. Archived from the original on 19 February 2013. Retrieved 9 December 2012.
- ^ "Small tsunami waves hit Japan after 7.3-magnitude earthquake". NBC.
- ^ "東北、関東で震度5弱＝宮城・石巻に津波1メートル－11人けが、沿岸部は一時避難". 時事ドットコム. 2012-12-07. Archived from the original on 2013-11-12. Retrieved 2012-12-08.
- ^ "東北震度5弱:8県で14人けが－ 毎日jp(毎日新聞)". Archived from the original on 2012-12-13. Retrieved 2012-12-09.
- ^ "ͤ ٣ 塡 ̵ ؤۤ ʿ j ̿ – Yahoo! ˥塼". Archived from the original on 2012-12-13. Retrieved 2012-12-09.
- ^ a b c "2万5000人が一時避難 震度5弱 交通機関ほぼ平常に". 河北新報. 2012-12-08. Archived from the original on 2012-12-13. Retrieved 2012-12-09.
- ^ a b c d "東北震度5弱:8県で14人けが". 毎日新聞. 2012-12-08. Archived from the original on 2012-12-13. Retrieved 2012-12-09.
- ^ "不明の船長、遺体で発見＝地震直後に沖合避難—岩手". 時事通信. 2012-12-14. Retrieved 2012-12-15.[permanent dead link]
- ^ "Kamaishi Japan Rocked By 7.3 Magnitude Earthquake & Ofunato Japan Shaken by 6.2 Quake". 7 December 2012.
- ^ "Japan earthquake sparks tsunami scare". BBC News. 2012-12-07.
- ^ "三陸沖地震 宇都宮で男性軽傷、市貝町で小学校の天井がずれる". 産経新聞. 8 December 2012. Archived from the original on 18 February 2013. Retrieved 9 December 2012.
- ^ Uchida, Naoki; Matsuzawa, Toru; Ellsworth, William L.; Imanishi, Kazutoshi; Shimamura, Kouhei; Hasegawa, Akira (2012-05-01). "Source parameters of microearthquakes on an interplate asperity off Kamaishi, NE Japan over two earthquake cycles". Geophysical Journal International. 189 (2): 999–1014. Bibcode:2012GeoJI.189..999U. doi:10.1111/j.1365-246X.2012.05377.x. ISSN 0956-540X.
External links
edit- The International Seismological Centre has a bibliography and/or authoritative data for this event.
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