Crustal Structures of P-Wave Velocity across the Taiwan Strait Analyzed from Obs Data (Ⅲ)

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基本資料

Project title

Code/計畫編號

MOST107-2611-M019-025

Translated Name/計畫中文名

海底地震儀震測資料分析跨越臺灣海峽之地殼P波速度構造研究 (Ⅲ)

Project Coordinator/計畫主持人

Tan-Kin Wang

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Institute of Earth Sciences

Website

https://www.grb.gov.tw/search/planDetail?id=12676674

Year

2018

Start date/計畫起

01-08-2018

Expected Completion/計畫迄

31-07-2018

Bugetid/研究經費

1216千元

ResearchField/研究領域

海洋科學

2017年計畫結果顯示，在臺灣海峽中部沿著E207測線的基盤頂部最深處(2公里深)位於測線東南側的烏坵凹陷與臺西盆地下方，可能是臺灣造山帶荷重於歐亞板塊大陸邊緣之上，導致板塊發生撓曲沉降形成的前陸盆地。而臺灣造山帶荷重造成的板塊彈性反應，亦在測線西北側造成基盤撓曲抬升(0.25公里深)，形成金門隆起的前凸起構造。並且在隆起的兩側伴隨數條斷層，形成東側的濱海一號斷裂帶與西側的濱海二號斷裂帶，可能為導致1604年泉州大地震的孕震構造。因此，第一年計畫將從臺灣海峽中部移往北部，分析於2018年6月在新竹西北方外海震測線收集的10部海底地震儀與多頻道反射震測資料。此外，2019年6月我們預計於馬祖東南方外海沿著跨越臺灣海峽北部的西北-東南向震測線，配合海研一號空氣槍與多頻道震測系統，於測線東南側收集10部海底地震儀與多頻道反射震測資料。第二年將從臺灣海峽北部移往臺灣海峽南部東側收集跨越HX07、HX08、HX09與E207測線之東北-西南向測線的海底地震儀震測資料，並整合第一年收集的震測資料，比較臺灣海峽北部、中部及南部地殼構造的異同。第三年則在臺灣海峽北部東側收集跨越E207與2018年及2019年施測測線之東北-西南向測線的海底地震儀震測資料與多頻道反射震測資料。綜合以上三年期計畫與2009年TAIGER計畫收集的震測資料，可建立臺灣海峽全區的海底地震儀測線之地殼P波速度構造，並建構臺灣海峽仿三維的地殼構造，以分析臺灣海峽斷層分布、莫荷面深度、地殼P波速度變化，進而探討臺灣海峽的孕震構造。 Based on the results of the project in 2017, the deepest top of the basement (2 km deep) along Profile E207 at the middle Taiwan Strait is located beneath the Wuchiu Depression and the Taihsi Basin at the southeast part of E207. The Wuchiu Depression and the Taihsi Basin may belong to the system of the foreland basins formed by flexural bending of the plate in response to the loading of the Taiwan orogenic belt at the edge of the Eurasian Plate. The elasticity of the plate caused by the Taiwan orogenic belt also formed a basement rise (0.25 km deep), Kinmen Rise, a fore-bulge at the northwest part of E207. Furthermore, First Littoral Fault Zone and Second Littoral Fault Zone, which might have been resulted in 1604 Quanzhou Earthquake, were also observed at both sides of Kinmen Rise. Therefore, in the first year of this project, the seismic experiment will be moved from the middle Taiwan Strait to the northern Taiwan Strait. Ocean-Bottom Seismometer (OBS) data and Multi-Channel Seismic (MCS) data along the seismic line across the northern Taiwan Strait off NW Hsinchu collected in June 2018 will be analyzed. In June 2019, 10 OBSs and MCS data will be collected by air-gun shooting from Ocean Researcher I at the southeast part of a NW-SE seismic line off SE Matsu across the northern Taiwan Strait. OBS and MCS experiments in the second year of this project will be continuously implemented at the east side of the southern Taiwan Strait along a NE-SW seismic line across Profiles HX07, HX08, HX09 and E207. And the OBS data collected in the first year of this project will be integrated to compare the differences of the crust structures between the northern, middle and southern Taiwan Strait. In the third year of this project, we will collect OBS and MCS data at the east side of the northern Taiwan Strait along a NE-SW seismic line across Profile E207 and 2018, 2019 seismic profiles. Based on the OBS and MCS data in this project during the next three years and the TAIGER project in 2009, the pseudo-3D crustal structures in the Taiwan Strait will be built from P-wave velocity structures along seismic profiles to determine the locations of faults, the Moho depth and the P-wave velocity variation of the crust in the Taiwan Strait. Therefore, we can interpret seismogenic structures in the Taiwan Strait.

Keyword(s)

撓曲
前陸盆地
濱海斷裂帶
海底地震儀
P波速度構造
Flexural Bending
Foreland Basin
Littoral Fault Zone
Ocean-Bottom Seismometer (OBS)
P-Wave Velocity Structure

DSpace CRIS

Crustal Structures of P-Wave Velocity across the Taiwan Strait Analyzed from Obs Data (Ⅲ)

基本資料

Description