菲律賓明多洛島(Mindoro)地處台灣─馬尼拉海溝系統的最南端，與最北端的台灣相較之下，有許多相似的地質特徵，例如海溝與由地震分布表現的隱沒帶(Wadati-Benioff zone)在進入本島內部時，都失去蹤跡、在台灣和明多洛本島內部都有因碰撞形成的崇高山脈。因此，在台灣的地質研究課題，可以應用到明多洛，包括：(1) 從隱沒到碰撞是如何轉移的，轉移的位置何在？(2) 在碰撞之前的隱沒板塊，呈現何種應力狀態？(3) 在本島內部消失的隱沒地震帶(Wadati-Benioff zone)，是因隱沒板塊的消失？還是存在著無地震的古隱沒板塊？這些課題的研究成果，除了可以瞭解明多洛的形成演化外，也可以經由對比，更加瞭解台灣的形成演化，進而對整個台灣─馬尼拉隱沒系統，有更深一層的認識。為從事以上的研究課題，我們計畫設置一個包含九個(五個將設置在明多洛西北部、四個在呂宋島南部)短週期地震儀的地震陣列，用來更佳描繪台灣─馬尼拉隱沒系統最南端的隱沒板塊形貌。陣列的觀測時間預計是三年，可視情況延長。我們這次提的三年國科會計劃是前一個一年計劃的延續。在前一個計劃中，經由菲律賓火山地震觀測所(PHIVOLCS)的協助，我們已經在明多洛找到五個適當的設站場址，並預計在2010 年一、二月間前往進行設站事宜。本次的三年計劃，重點將在呂宋島南部四個測站的設置，以及接續的資料回收工作。我們將與菲律賓火山地震觀測所的人員合作，共同分析處理所蒐集的資料。此計劃將實際加強台灣與菲律賓地震學家的雙邊合作。 The island of Mindoro locates on the southernmost tip of the Taiwan-Manila trench system. Some geological features here resemble those of the northernmost tip in Taiwan, e.g., the termination of trench and Wadati-Benioff zone as we traced into the interior of the island, and the high mountain range in the central part of the island. It is interesting to raise the following similar questions in Mindoro. (1) How and where the transition from subduction to collision occurs? (2) What are the slab stress patterns? (3) The lacking of the Wadati-Benioff zone beneath central Mindoro is due to the absence of slab or the presence of an aseismic slab? To tackle the aforementioned questions, we propose to deploy a seismic network of nine short-period stations (five in northwest Mindoro and four in south Luzon) to better delineate the Wadati-Benioff zone at the southernmost tip of the Taiwan-Manila subduction system. The planed period of monitoring is three years, with a potential of extension pending on the development of the project. This three-year proposal serves as a continuous project from the previous one-year proposal in which we already visited the five station sites in Mindoro and will deploy them in Jan. and Feb. of 2010, cooperating with PHIVOLCS. The current proposal will focus on the deployment of the rest four stations in south Luzon and the following tasks of data retrieval for the deployed stations. Furthermore, we will form a team with persons form PHIVOLCS to analyze data collected. The project will largely enhance the international cooperation of seismologists between Taiwan and the Philippines. 研究期間：9908 ~ 10007
