Java Trench


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Related to Java Trench: Mariana Trench, South Sandwich Trench

Java Trench

 

(also Sunda Trench), a deep trench in the eastern part of the Indian Ocean. The Java Trench extends from the base of the continental slope of Burma (about 18°N lat.) along the underwater slopes of the Andaman, Nicobar, and Greater Sunda islands for a distance of about 2,900 km. The trench floor, which is narrow in the east, reaches a maximum depth of 7,130 m (7,209 m or 7,450 m according to soundings taken south of Java)—the greatest depth in the Indian Ocean. In the northern and central parts, the trench floor has a width of about 35 km and is leveled by a layer of sediment whose thickness reaches 3 km in the north. The sediments are terrigenous silts with a large admixture of volcanic material.

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The epicenter of Monday's quake was on the edge of a subduction zone, an area where two tectonic plates meet with ones sliding underneath the other, located at the end of the Sumatra fault line, which cuts through Sumatra and runs southeast, or between the Java trench and Java Island, ending in the Ujung Genteng area, about 100 km southwest of Jakarta.
As one plate is thrust beneath another to form the deep Java Trench, it causes the buildup of stress in rock formations, which slip suddenly to generate earthquakes.
26 quake shifted additional stress farther south along the Java Trench.

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