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1981 Irian Jaya earthquake
On January 19, 1981, eastern Indonesia was struck by an earthquake known as the 1981 Irian Jaya earthquake. Registering a magnitude of 6.8 on the Richter scale, it killed more than 300 people, damaging structures and buildings across the Irian Jaya province.
Indonesia is highly active in terms of seismicity and volcanic eruptions, with a subduction zone and many faults. It is neighbored by several tectonic plates. Such earthquakes pose a significant threat to life in the area through earthquakes and also tsunamis.
== Geology ==
Indonesia, one of the most seismically active places in the world, hosts hundreds of islands, many with volcanoes. It is an island arc, composed by a subduction zone (in the Sunda Trench) and islands. Unlike most subduction zones, the Sunda Trench is parallel to the chain of islands to which it corresponds, creating strike-slip faulting. Indonesia itself is surrounded by multiple tectonic plates - namely the Pacific, the Southeast Asia lithospheric, and the Indo-Australian Plates - causing it to be a so-called hotspot for both seismic and volcanic activity.
The epicenter was in Papua Province, in the Irian Jaya Province. The orientation and type of faulting is uncertain, due to a poorly constrained focal mechanism but is thought to have been a reverse fault.
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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