2012-08-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/671492摘要：本計畫以地震學方法研究高加索地區之速度構造及地震特性，並藉著與西藏高原之對比來探討這兩個分別位於東亞與西亞造山帶上的陸-陸碰撞模式。二者在板塊碰撞的背景相似，西藏是印度板塊往北與歐亞板塊劇烈碰撞後岩石圈增厚所形成的巨大高原，為多數研究學者追逐的典型範例。伊朗高原北邊的高加索山則代表阿拉伯板塊與歐亞板塊碰撞的最北緣，然而該區域的研究仍然很少。申請人過去主要研究西藏下方之岩石圈構造，發現地殼由南往北變薄、羌塘地塊下的地函速度異常及西藏岩石圈剝離卻可能含水等現象。此計畫為申請人過去研究之延伸，高加索研究之基本前置工作已經就緒，甫獲台大補助購置地震儀以正式展開多年期跨領域的絲路合作計畫，主探討大陸造山帶的演化。本計畫若能獲得國科會支持，將可對西藏的岩石圈速度構造作更仔細的研究，擴大高加索地區之地震網，進一步分析此碰撞帶之地震活動及岩石圈性質，以了解影響演化之條件及岩石-地函之互動。 <br> Abstract: We propose to study the velocity structure and earthquake properties beneath Caucasus region, located north of Iranian plateau. It marks the northern boundary of the collision between Arabia and Eurasia. When compared with Tibet, the speed of convergence is smaller and initiated later, with similar geologic features on the surface. It might be considered as a baby Tibet under development, making it an interesting target for further investigation. However, little seismic constraints are available in Caucasus. New observations are desired to make important contributions. In our previous work, we found crustal thickness is thinner and the upper mantle velocity is slower in the northern Tibet. We also discovered seismic anomalies that may be associated with a delamination of Tibetan lithospheric mantle and the detached lithosphere might be hydrous. In the proposed study, we aim to examine the structure in detail under Tibet, which serves as a high-quality basis for comparison. More importantly, we plan to use 3-year period to expand the network in Caucasus and explore the seismic properties of the crust and upper mantle there. Such contrasting study of Caucasus and Tibet are important for our understanding to the controlling factors of evolution during collision and the dynamic interactions between the involving plates.西藏高加索大陸碰撞地震波多重路徑接收函數地函過渡帶震源機制解TibetCaucasuscontinental collisionseismic triplicationreceiver functionsmantle transition zonefocal mechanism.