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] |
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.
The 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]
Some 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]
In 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]