Sedimentary and Crustal Velocity Structures of the Foreland Basin System in Taiwan Strait Analyzed from Obs and Mcs Data (II)

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基本資料

Project title

Code/計畫編號

MOST109-2611-M019-010

Translated Name/計畫中文名

海底地震儀與多頻道反射震測資料分析臺灣海峽前陸盆地系統之沉積與地殼速度構造(Ⅱ)

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=13540602

Year

2021

Start date/計畫起

01-08-2020

Expected Completion/計畫迄

31-07-2021

Bugetid/研究經費

1254千元

ResearchField/研究領域

海洋科學

第一年計畫將於2020年6月在臺中外海，配合海研二號時差式空氣槍 (GI gun)與多頻道反射震測系統，收集間距2.5公里的10部海底地震儀與多頻道反射震測資料。本計畫將分析2020年臺中外海收集的震測資料，並與臺灣海峽中部過去的研究結果整合，建立臺灣海峽中部的沉積層速度構造。2021年6月與2022年6月將在澎湖西部外海平行臺灣海峽中線與平行臺灣海岸線，收集20部海底地震儀與多頻道反射震測資料。本計畫也將分析2021年與2022年澎湖西部外海收集的震測資料，並與臺灣海峽中部及南部過去的研究結果整合，建立臺灣海峽南部到中部的地殼速度構造。綜合以上三年期計畫，可建立臺灣海峽全區的沉積層與地殼P波與S波速度構造。臺灣造山帶的持續荷重使臺灣海峽東部地殼撓曲，並使前陸凸起頂部以及前陸凸起與前淵的邊界從臺灣海峽中線向西移動到臺灣海峽西部。本計畫的成果將使我們能決定，因受到臺灣海峽東部地殼撓曲的影響，臺灣海峽北部、中部與南部前陸盆地系統及前陸凸起頂部位置的差異。2018年發生在臺灣海峽新生代凹陷區的澎湖地震(規模6.1)為近20年來臺灣海峽發生規模最大的地震。本計畫震測資料解析的臺灣海峽斷層分布(例如濱海斷裂帶、盆地東南側的邊界斷層、東山斷層與義竹斷層等)與地殼孕震構造將有助於沿岸離岸風力發電、海底電纜、海底隧道等海峽兩岸最短路線的海底工程地質評估。 In June 2020, we will collect 10 ocean-bottom seismometers (OBS) with an interval of 2.5 km and multi-channel seismic (MCS) data off Taichung by GI guns shooting from Ocean Researcher II. The seismic data collected off Taichung in 2020 will be analyzed and be integrated with the previous results to construct the iso-depth and P-wave velocity maps of sedimentary structures in the middle Taiwan Strait. In June 2021 and 2022, we will collect 20 OBSs and MCS data off western Penghu, parallel to the central line of the Taiwan Strait and parallel to the Taiwan coastline, respectively. The seismic data collected off western Penghu in 2021 and 2022 will be analyzed and be integrated with the previous results in the middle and southern Taiwan Strait to construct the iso-depth, P-wave velocity and S-wave velocity maps of the crustal structures from the middle to the southern Taiwan Strait. Through the three-year project, the sedimentary and crustal structures in the whole Taiwan Strait will be built. The continuous loading of the Taiwan orogenic belt has led more flexure of the crust in the eastern Taiwan Strait so that the top of the forebulge and the boundary of the forebulge and the foredeep may have been moved from the central line to the western Taiwan Strait. The results of this project will enable us to determine the differences of the foreland basin system and the location of the top of the forebulge from north to south due to the crustal flexure in the eastern Taiwan Strait. 2018 Penghu Earthquake (Mw~6.1) in the Taiwan Strait Cenozoic Depression was the largest earthquake during the past 20 years in the Taiwan Strait. The fault distribution (e.g., Littoral Fault Zone, boundary faults SE of the basins, Dongshan Fault and Yichu Fault) and the crustal seismogenic structures in the Taiwan Strait imaged from this project will assist us to evaluate the submarine engineering of offshore wind farms, submarine cables and submarine tunnels through the shortest distance across Taiwan Strait.

Keyword(s)

地殼撓曲
前陸凸起
前陸盆地
濱海斷裂帶
孕震構造
Crustal Flexure
Forebulge
Foreland Basin
Littoral Fault Zone
Seismogenic Structure

DSpace CRIS

Sedimentary and Crustal Velocity Structures of the Foreland Basin System in Taiwan Strait Analyzed from Obs and Mcs Data (II)

基本資料

Description