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  | |
| UTC time | ?? |
|---|---|
| ISC event | |
| USGS-ANSS | |
| Date * | August 9, 2009 |
| Local date | |
| Local time | |
| Magnitude | Mw 7.1 |
| Depth | 297 km |
| Epicenter | 33°07′19″N138°01′34″E / 33.122°N 138.026°E |
| * Deprecated | See documentation. |
The 2009 Izu Islands earthquake (2009年東海道南方沖の地震) occurred on August 9, 2009 at 19:55 local time (10:55 UTC) near the Izu Islands, off the south coast of Honshu, Japan. The epicenter was 170 km from Hamamatsu and 325 km from Tokyo. [1]
The Izu Islands are a group of volcanic islands stretching south and east from the Izu Peninsula of Honshū, Japan. Administratively, they form two towns and six villages; all part of Tokyo Prefecture. The largest is Izu Ōshima, usually called simply Ōshima.
Honshu is the largest and most populous island of Japan, located south of Hokkaido across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyushu across the Kanmon Straits. The island separates the Sea of Japan, which lies to its north and west, from the North Pacific Ocean to its south and east. It is the seventh-largest island in the world, and the second-most populous after the Indonesian island of Java.
Japan is an island country in East Asia. Located in the Pacific Ocean, it lies off the eastern coast of the Asian continent and stretches from the Sea of Okhotsk in the north to the East China Sea and the Philippine Sea in the south.
This was an intraplate earthquake within the Pacific Plate, which is subducting beneath the Philippine Sea Plate at the Izu-Bonin trench in this region. In Tokyo, the intensity reached shindo 4 [2] (MM IV according to USGS). There was a region of abnormal seismic intensity along the Pacific coast close to the Japan Trench, in which the seismic intensity was greater than that observed in the region closer to the epicenter. [3] Due to its depth of 297 km, this earthquake did not cause any damage. [4]
The Pacific Plate is an oceanic tectonic plate that lies beneath the Pacific Ocean. At 103 million square kilometres (40,000,000 sq mi), it is the largest tectonic plate.
The Philippine Sea Plate or the Philippine Plate is a tectonic plate comprising oceanic lithosphere that lies beneath the Philippine Sea, to the east of the Philippines. Most segments of the Philippines, including northern Luzon, are part of the Philippine Mobile Belt, which is geologically and tectonically separate from the Philippine Sea Plate.