台北盆地松山層三維剪力波速度構造; 3D Shear-wave Velocity Structure of Songshan Formation, Taipei Basin.

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Title:	台北盆地松山層三維剪力波速度構造;3D Shear-wave Velocity Structure of Songshan Formation, Taipei Basin.
Authors:	沈士崴;Shih-wai Shen
Contributors:	應用地質研究所
Keywords:	聯合克力金法;松山層;剪力波速度;台北盆地;Songshan Formation;cokriging;shear-wave velocity;Taipei basin
Date:	2008-07-09
Issue Date:	2009-09-22 09:59:45 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本研究採用台北盆地內氣象局自由場強震站場址鑽探及剪力波測量資料暨盆地內豐富的工程地質鑽探資料與少數鑽孔內的剪力波測量資料，以地質統計學方法對剪力波速度及標準貫入試驗值SPT-N進行三維空間分析，並使用三維的聯合克力金法進行空間資料推估，以瞭解台北盆地松山層土壤的剪力波速度在空間上的分布及其變異性，提供後續相關研究之參考。　　結構分析顯示，松山層土壤的剪力波速度及SPT-N性質具有良好的空間變異關係，因此可將剪力波速度做為主要變數及SPT-N值做為輔助變數，以聯合克力金法進行空間推估，得到台北盆地內三維規則網格的剪力波速度值以及估計誤差值，繪製各不同深度之剪力波速度等值圖及剖面圖。　　由研究結果顯示，松山層土壤的剪力波速度大體上隨深度增加而增加；從10公尺深約100~200m/s逐漸增加到45公尺深約400~500m/s。平面變化上，若以松山層的上半部或距地表30公尺內平均剪力波速Vs30來看，是以台北市中山區一帶最低 (160~180m/s)；次低區 (180~200m/s) 包括內湖以西之台北盆地東北半部，包括：台北市北投、士林、大同、中山、中正、大安、信義、松山等區及台北縣三重市。由上述次低區往西南，Vs30逐漸增加，到新莊、板橋、中和及永和一帶Vs30約為220~240m/s，樹林、土城一帶可達260m/s。本研究結果與前人對於台北盆地剪力波速度的研究結果相符，但有更豐富的細節表現及更小的推估誤差。 This study estimates shear-wave velocity structure of Songshan Formation in Taipei basin using shear-wave velocity data and standard penetration test data (SPT-N) from boring and testing data at free-field strong-motion station sites and Geo2005 database, and other sources. Geostatistical analysis of semivariograms and cross-semivariograms in 3D and cokriging method was used for the estimation. Structural analyses of shear-wave velocity data and SPT-Ns show good spatial relations in each semivariogram and cross-semivariogram. Therefore, shear-wave velocity was used as a primary variable and SPT-N as a secondary variable in the cokriging method. The result is a 3D regular grid digital model, and is shown by a set of contour maps and profile maps. Shear-wave velocity value in the Songshan Formation increases with depth; it is about 100~200m/s within 10m depth and increases to 400~500m/s at about 45m depth. Horizontal variation of Shear-wave velocities may be shown by the variation of average shear-wave velocity within 30m depth (Vs30). The Vs30 map shows low value (160~180m/s) at Zhongshan District, and shows moderately low value (180~200m/s) at Beitou, Shilin, Datong, Zhongshan, Zhongzheng, Daan, Xinyi, Songshan District and Sanchong City. Shear-wave velocities increase from the above-mentioned low and moderately-low zones to the southwest, and reach a moderate value (220~240m/s) at Sinjhuang, Banciao, Junghe and Yunghe. It reaches 260m/s at Shulin and Tucheng. Result of this study is similar with previous researches in general, but it shows more details and lower estimation error in the variation of shear-wave velocities.
Appears in Collections:	[Graduate Institute of Applied Geology] Electronic Thesis & Dissertation

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