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

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基本資料

Project title

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(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=12230571

Year

2017

Start date/計畫起

01-08-2017

Expected Completion/計畫迄

31-07-2018

Bugetid/研究經費

1715千元

ResearchField/研究領域

海洋科學

第一年計畫利用2017 年6 月於金門東南方海域沿著跨越臺灣海峽中部震測線收集的海底地震儀資料，分析臺灣海峽中部的地殼P 波速度構造。根據2016 年計畫初步結果顯示，臺灣海峽新生代凹陷區兩側有許多P 波速度異常帶，可能為臺灣西部前陸盆地板塊撓曲沉降的影響，形成的地塹與地壘構造，並造成斷層。進一步，於模型西北側的濱海斷裂帶區域發現較大的側向P 波速度變化(5.0-5.8 公里/秒)，可能為斷層構造延伸至深部地殼導致P 波速度異常，且可能為導致1604 年泉州大地震的孕震構造。因此，2018 年6 月我們預計於福建泉州至澎湖之間的海域，使用海研二號在海峽中線以東施放與回收海底地震儀，並配合福建震測船延平二號，搭載12000 立方英吋的空氣槍進行炸測。第二年將從臺灣海峽中部移到澎湖海盆北邊收集海底地震儀震測資料，並整合第一年收集的海底地震儀震測資料建立臺灣海峽中部地殼構造模型；第三年則會分析臺灣海峽北部海底地震儀震測資料。綜合以上三年期計畫與2009 年TAIGER 計畫收集的海底地震儀震測資料，可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，並提供海峽兩岸沿海的核能電廠及高速鐵路建設及運作的評估參考。 In the first year of this project, Ocean-Bottom Seismometer (OBS) data across the central Taiwan Strait off SE Kinmen collected in June 2017 will be analyzed to image the P-wave velocity structures of the crust. Based on the preliminary results of the project in 2016, several P-wave velocity anomaly zones observed at both sides of Cenozoic depression zone in the Taiwan Strait can be interpreted as faults between the graben and the horst owing to the flexural bending in the foreland basin. Furthermore, faults may extend to deeper structure based on the large lateral variation of the P-wave velocity in the Littoral Fault Zone which might have been resulted in 1604 Quanzhou Earthquake. Thus, between the Quanzhou and the Penghu in June 2018, OBSs will be deployed and recovered by Ocean Researcher II east of the central line in the Taiwan Strait and will receive signals from an air-gun array with a total volume of 12,000 in3 provided by the R/V YanPing II of Fujian. An OBS experiment in the second year of this project will be continuously implemented north of the Penghu Basin and crustal thickness in the central Taiwan Strait will be integrated by analyzing OBS data collected in the first year of this project. In the third year of this project, OBS data collected in the northern Taiwan Strait will be analyzed. Based on integration of OBS data in this project during the next three years and the TAIGER project in 2009, the locations of faults, the Moho depth and the P-wave velocity variation in crustal layers will be determined in the Taiwan Strait. Therefore, we can interpret seismogenic structures in the Taiwan Strait and provide information for building and operation of the nuclear power plants and the high-speed rails along the coasts of Taiwan and Fujian.

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(II)

基本資料

Description