由雷利波頻散資料推研台灣海峽之地殼及上部地函構造; Crustal and Upper Mantle Structure under the Taiwan Strait from Rayleigh Wave Dispersion Data

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Title:	由雷利波頻散資料推研台灣海峽之地殼及上部地函構造;Crustal and Upper Mantle Structure under the Taiwan Strait from Rayleigh Wave Dispersion Data
Authors:	梁信強;Hsin-Chiang Liang
Contributors:	地球物理研究所
Keywords:	頻散;雷利波;台灣海峽;相速;Rayleigh wave;Taiwan Strait;Dispersion;Phase velocity
Date:	2006-07-08
Issue Date:	2009-09-22 09:55:35 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本研究將陣列分析法應用在雙站法上，使用中央研究院寬頻地震網(BATS)之中的4個地震測站，最後分析了5條路徑通過台灣海峽地區，求得週期範圍18~90秒的雷利波相速頻散資料。本研究並使用線性逆推法探求台灣海峽地區地殼及上部地函的一維速度構造。結果顯示，台灣海峽的地殼厚度分別淺於福建沿海以及台灣西部沿海，且由逆推結果得知台灣海峽淺部的S波速度均比福建沿海與台灣西部沿海來得快，顯示台灣海峽的地殼較薄，故很快即進入上部地函，然而同時也發現進入較深的構造時，台灣海峽的S波速度較其他兩者慢。再者，台灣海峽底下沒有非常明顯的頂蓋-低速層的構造存在，而福建沿海以及台灣西部沿海則均有明顯的頂蓋-低速層的構造存在。最後，在岩石圈部份，由福建沿海以及台灣西部沿海兩條路徑，得知台灣海峽地區的岩石圈厚度約70~80公里。 We have applied array analysis to two-station method to obtain the Rayleigh-wave phase velocities in the Taiwan Strait to extract the regional crustal and upper mantle structure. Seismograms from teleseismic sources recorded by 4 BATS stations were used to determine the phase velocity dispersion data of Rayeigh waves with period range from 18 to 90 sec for 5 wave paths crossing the Taiwan Strait. An inversion analysis on the dispersion data for each path gave the one-dimensional shear-wave velocity structure beneath the path. Inversion results show that crust under the Taiwan Strait has relative high velocities and thin thickness when comparing with the west Taiwan and southeastern China. S wave velocities of upper mantle in the Taiwan Strait are lower than the west Taiwan and southeastern China. A lid-low velocity zone structure of upper mantle fails to be discovered in the Taiwan Strait. The overall thickness of lithosphere under the Taiwan Strait is about 70~80 km.
Appears in Collections:	[Graduate Institute of Geophysics] Electronic Thesis & Dissertation

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