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Sunda Trench
The Sunda Trench, earlier known as, and sometimes still indicated as the Java Trench,〔''Sunda Trench'' (4°30' S 11°10' S 100°00' E 119°00' Accredited by: SCGN (Apr. 1987) The trench was studied in some detail in 1920's-1930's by Dutch geodesist F.A. Vening Meinesz, who made classic pendulum gravity measurements in a Dutch submarine. Shown as Java Trench in ACUF (Advisory Committee on Undersea Features Gazetteer). see also: http://www.gebco.net/〕 is located in the northeastern Indian Ocean, with a length of .〔(Java Trench ) - article from Encylopedia Britannica〕 The maximum depth of (at 10°19'S, 109°58'E, about 320 km south of Yogyakarta), is the deepest point in the Indian Ocean. The trench stretches from the Lesser Sunda Islands past Java, around the southern coast of Sumatra on to the Andaman Islands, and forms the boundary between Indo-Australian Plate and Eurasian plate (more specifically, Sunda Plate). The trench is considered to be part of the Pacific Ring of Fire as well as one of a ring of oceanic trenches around the northern edges of the Australian Plate.
There is scientific evidence that the 2004 earthquake activity in the area of the Java Trench could lead to further catastrophic shifting within a relatively short period of time, perhaps less than a decade.〔(Asia primed for next big quake - earth - 19 March 2005 - New Scientist Environment )〕 This threat has resulted in international agreements to establish a tsunami warning system in place along the Indian Ocean coast.〔(IOC: Towards a Tsunami Warning System in the Indian Ocean )〕
== Characteristics ==
For about half its length, off of Sumatra, it is divided into two parallel troughs by an underwater ridge, and much of the trench is at least partially filled with sediments. Mappings after the 2004 Indian Ocean earthquake of the plate boundary showed resemblance to suspension bridge cables, with peaks and sags, indicative of asperity and locked faults, instead of the traditional wedge shape expected.〔(Physorg:Folded sediment unusual in Sumatran Tsunami area )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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