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Deep-focus earthquake
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Deep-focus earthquake : ウィキペディア英語版
Deep-focus earthquake
A deep-focus earthquake in seismology is an earthquake with a hypocenter depth exceeding 300 km. They occur almost exclusively at oceanic-continental convergent boundaries in association with subducted oceanic lithosphere. They occur along a dipping tabular zone beneath the subduction zone known as the Wadati–Benioff zone.
== Discovery ==

Preliminary evidence for the existence of deep-focus earthquakes was first brought to the attention of the scientific community in 1922 by H.H. Turner. In 1928, Wadati proved the existence of earthquakes occurring well beneath the lithosphere, dispelling the notion that earthquakes only occur with shallow focal depths.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Deep-focus earthquake」の詳細全文を読む



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