希臘島弧之隱沒板塊應力探討; An Investigation of the Slab Stress in the Hellenic Arc

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Title:	希臘島弧之隱沒板塊應力探討;An Investigation of the Slab Stress in the Hellenic Arc
Authors:	陳伯飛
Contributors:	地球物理研究所
Keywords:	slab stress;Hellenic arc;ping-pong model;地球科學類
Date:	2008-07-01
Issue Date:	2010-12-28 15:04:46 (UTC+8)
Publisher:	行政院國家科學委員會
Abstract:	本研究計劃由中深部地震所表現的應力方向來探討希臘島弧的隱沒板塊之應力形態。該隱沒板塊源起自非洲板塊在地中海東部下插隱沒於歐亞板塊之下，由隱沒作用所引起的地震，最深可達180 公里。此研究的動機有三: 一、希臘島弧在地表所展現的高曲度有可能屬於隱沒角度的一半遠大於曲率半徑與法線的夾角的類型，此類型的隱沒板塊在地球的其他各地大多呈現側向拉張的應力形態，與乒乓模型的預測相符。因此，我們極有興趣探討希臘島弧的隱沒板塊之應力形態是否也屬同一類型。二、過去幾年來，此地區有關地震定位與地震矩張量的資料，不管是區域地震網或是遠震資料的結果，都累積了一定的數量，此累積的資料庫將使我們的探討計劃可行。三、從過去的經驗中，我們針對高曲度島弧的隱沒板塊發展了圓柱投影來處理連續的方位變化，我們也應用了板塊座標的投影來觀測地震應力與板塊幾何間的相互關係。這些工具在我們過去作全球分析時即已發展完備，如今可直接套用。結果將可使過去的全球分析更為完備。此計劃將與Kostas Konstantinou 博士大量合作，他是即將到中央大學任教的希臘地震學家。 We propose an investigation to examine the relationship between stress orientations of intermediate-depth earthquakes and the Wadati-Benioff zone in the Hellenic arc, where the African plate subducts underneath the Eurasian plate on the east Mediterranean Sea and the earthquakes extend as deep as 180 km. Reasons for the proposal are three-fold. (1) The strong curvature of the Hellenic arc on surface makes it a likely candidate for the category where the half dip angle is far greater than the radius of curvature. Other subduction zones in the category tend to exhibit lateral extension as the 「ping-pong」model predicted. It is thus interesting to probe the pattern of slab stress in the Hellenic arc. (2) A significant amount of data, including earthquake locations and moment tensor solutions both from local seismic network and teleseismic studies, have accumulated for the past few years. The amount of data available to us now makes the investigation feasible. (3) For strong curvature trenches, we have developed cylindrical projection to neatly determine the dip angle of the subducting slab while account for the continuing change of strike. We also applied slab coordinates projection to examine the stress orientations of intermediate-depth earthquakes relative to the in situ slab geometry. Schemes for both analyses are readily available for us because we have done similar analysis on a global scale. Results of this investigation are essential for testing current models explaining origin of slab stresses and are also complementary to our previous global survey. The project will be largely in cooperation with Dr. Kostas Konstantinou. He is a Greek seismologist who will be teaching at National Central University. 研究期間：9608 ~ 9707
Relation:	財團法人國家實驗研究院科技政策研究與資訊中心
Appears in Collections:	[Graduate Institute of Geophysics] Research Project

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