台灣大地動力學國際合作研究計畫(IV)---台灣海峽高爆實驗; Taiwan Integrated Geodynamic Research (IV)---Across Taiwan-Strait Explosion Experiment

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题名:	台灣大地動力學國際合作研究計畫(IV)---台灣海峽高爆實驗;Taiwan Integrated Geodynamic Research (IV)---Across Taiwan-Strait Explosion Experiment
作者:	王乾盈
贡献者:	地球物理研究所
关键词:	地球科學類
日期:	2010-08-01
上传时间:	2011-07-13 14:44:19 (UTC+8)
出版者:	行政院國家科學委員會
摘要:	（台灣造山帶、薄皮理論、岩石圈碰撞）台灣弧-陸碰撞造山帶的形成是極具挑戰性的科學問題，「薄皮理論」及「岩石圈碰撞」都曾經用來解釋台灣造山帶所觀測到的地球科學資料。Suppe (1987) 首先提出台灣的薄皮構造模型，認為板塊隱沒發生在厚15 公里增積岩體內。不過，隨著台灣豐富的地震數據的增加，有證據顯示在中央山脈地區下的地殼有50 公里厚，並發現一般速度分佈不符合增積岩體模型，Wu（1996）提出岩石圈增厚模型，來解釋此現象。本計畫結合現代地質和地球物理學的技術，仔細檢查現有的造山帶模型，實驗的設計可以達到以前沒辦法獲得的地殼與地函構造的測繪精度。透過問題的測試、資料的整合及解釋，期望為台灣建造一個完整的大地構造模型。本計畫從2007～2009 年完成下列工作： 1）陸地及海底寬頻地震儀天然地震觀測，2）陸上爆炸震源廣角反射，3）海陸聯炸及海底多波道反射震測，4）構造地質、定年及岩石分析，5）大電電磁研究，6）大地動力模型。該階段工作已經完成，現在正積極整理大量資料，初步發現台灣莫荷面深度南北變化不大，都在 35～45km 範圍。本計畫進行廣角反射炸測時，中國福建省地震局亦在福建省內，沿台灣來的測線方向布置地震儀，並清楚收到來自台灣的高爆信號。反過來，2010 年9～11 月福建省地震局將在福建境內施放兩點炸藥（各2000kg），為不失此良機，本計畫延續以往TAIGER 的工作，發動國內地震研究單位，設法布置兩條海陸測線，接收此難得的高爆信號，以完成整條橫跨台灣－台灣海峽－福建之剖面，探討從台灣造山帶到大陸穩定地塊的構造變化。（Taiwan orogeny, Thin-Skinned tectonics, lithospheric collision） The Taiwan arc-continent collision is one of the most challenged tectonic problems in the world. Both ‘thin-skinned model’ and ‘lithospheric collision model’ have been invoked to explain the geologic and geophysical attributes. The thin-skinned tectonics model was proposed by Suppe (1987), which calls for the buildup of a 15-km thick wedge during subduction of the Asian lithosphere. With the improved Taiwan seismic network in 1991, the local earthquake data became adequate for more detailed seismic tomography. The imaged crust under the Central Range can be as deep as 50 km and the general velocity structures under the Central Range are found inconsistent with those of an accretionary wedge. Wu et al. (1997) considered all these data and proposed that a continuous lithospheric deformation model (Molnar et al., 1999) may be applicable to Taiwan. This hypothesis predicts that deformation extends not only into the lower crust but also into the upper mantle. The integrated research plan outlined in this proposal, which integrates modern geologic and geophysical techniques, is designed to make use of this “natural laboratory” to test the predictions of existing models for mountain building. Our proposed study is specifically crafted to characterize these first order aspects of mountain belt structure and structural history, and expect to build a comprehensive geodynamic model for the evolution of collisional mountain belts of Taiwan. The project has been carried out during 2007~2009, including: 1) passive earthquake source broadband seismometer observation, 2) land thousand-kg dynamite explosion, 3) sea-land airgun shooting, 4) MT profile, 5) rock property analysis and dating, 6) theoretical plate collision modeling. At the present time, the data processing is actively undertaken to treat the tremendously large volume of data. Many interesting results may come out quite soon. The present proposal is to take care of an extension job of the 2008 experiment. The Fujan earthquake administration has deployed a seismic line to receive the signals from our 2008 explosions. Now, they take the turn and plan to make two 2000kg dynamite explosions in Sep., 2010 in Fujan. We plan to deploy tow sea-land lines to receive these precious signals from the mainland. The data would be of help to examine the structures from the Taiwan mountain-building area to the mainland stable continent. 研究期間：9908 ~ 10007
關聯:	財團法人國家實驗研究院科技政策研究與資訊中心
显示于类别:	[地球物理研究所] 研究計畫

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