Sebon

The earthquake and tsunami in Japan, 2011, officially known by the Japan Meteorological Agency as the earthquake in the Pacific coast of Tohoku region, 2011 (东北 地方 太平洋 冲 地震 Tohoku Chiho Taiheiyo-oki Jishin6?) Or Great Earthquake Eastern Japan (东 日本 大 震灾 Higasi Dai-Nihon-Shinsai) March 11, was a magnitude 9.0 earthquake that created MW1 tsunami waves of up to 40.5 meters.7 The earthquake occurredat 14:46:23 hours local (5:46:23 UTC) on Friday March 11, 2011. The earthquake's epicenter was located at sea, off the coast of Honshu, 130 km east of Sendai in Miyagi Prefecture, Japan. At first we calculated the magnitude at 7.9 degrees MW, which was subsequently increased to 8.8, then 8.9 degrees by the Geological Survey (USGS) . Finally degrees to 9.0 MW confirmed by the Japan MeteorologicalAgency and USGS.9 The earthquake lasted about 6 minutes depending expertos.10 The USGS said the quake occurred because of a shift in the zone near the interface between subducting plate between the plate Pacific and North American plate. In the latitude at which the earthquake occurred, the Pacific plate moves westward over the North American plate at a speed of 83 mm / year. The Pacific platemoves under Japan in the Japan Trench, and sinks in the west under Asia.1
Two days before this earthquake was preceded by another major quake, but of lesser magnitude, occurred on Wednesday, March 9, 2011, at 2:45:18 UTC in the same area of the east coast of Honshu, Japan and had an intensity of 7.2 MW at a depth of 14.1 km. Also that day the authorities of the Japan Meteorological Agency gave atsunami warning, but only locally, to the east coast of that country. On February 1 had entered Shinmoe volcano activity in the province of Miyazaki, this indicates a tectonic reactivamiento the pre-terremoto.
The magnitude of 9.0 MW made him the most powerful earthquake in Japan suffered to fecha7 well as the fourth most powerful in the world of all earthquakes measured to fecha.12 13 Since 1973 thesubduction zone of the Japan Trench has experienced nine seismic events of magnitude 7 or higher. The largest was an earthquake in December 1994 which had a magnitude of 7.8 degrees, centered about 260 km north of the earthquake on March 11, 2011, which caused three deaths and 300 wounded.
Hours after the earthquake and subsequent tsunami, volcano Karangetang Celebes Islands (Indonesia) cameinto erupción.14 using NASA satellite imagery has been found that the quake may have moved the Japanese island about 2.4 meters, and altered the earth's axis by about 10 centímetros.15 The violence of the earthquake shortened the length of day by 1.8 microseconds, according to research conducted by JPL for NASA.

Earthquake

Soil liquefaction, one of the effects left by the earthquake.
The mainearthquake was preceded by a long series of previous earthquakes that began with an earthquake of 7.2 MW on March 9, 2011, about 40 kilometers away from where the earthquake occurred on March 11 and followed of three on the day of the catastrophe that exceeded the 6 MW of intensidad.7 A minute before the main earthquake, the Earthquake Warning System, connected to about 1,000 seismographs inJapan, sent a series of notices to different media Japanese media warning of impending danger. It is believed that through these alerts were saved a lot of personas.17
The earthquake's epicenter was located in the Pacific Ocean, 130 kilometers east of Sendai, Honshu, at 14:46 local time. Amounted to 373 miles from Tokyo, capital of Japan, according to the Geological Survey (USGS). After the earthquakethere were multiple replicas. A magnitude 7.0 earthquake occurred at 15:06 local time, at 7.4 at 15:15 local time and 7.2 hours at 15:26 local.18 19 20 After the initial earthquake were recorded over a hundred aftershocks above 4.5 grados.
maginitudes
At first, the USGS reported that the magnitude was 7.9 but quickly changed to 8.8 and then 8,9,7 and then to between 9.0 and 23 9,1.22
This...