| 1999年台湾集集地震近断层竖向与水平反应谱比值的研究 |
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| 引用本文： | 周锡元,徐平,王国权,闫维明.1999年台湾集集地震近断层竖向与水平反应谱比值的研究[J].地震地质,2006,28(3):325-335. |
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| 作者姓名： | 周锡元 徐平 王国权 闫维明 |
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| 作者单位： | 北京工业大学抗震减灾研究所、工程抗震与结构诊治北京市重点实验室,北京,100022 |
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| 摘 要： | 选取了1999年9月21日台湾集集7.6级地震主震中68组断层距在20km以内的近断层台站记录和46组断层距在40~70km的东部台站记录,按台站的上下盘位置、场地条件和断层距分组,对其竖向和水平加速度反应谱比值V/H进行了统计分析。研究表明:1)断层的滑动方向和断层破裂的传播方向对断层距在3km以内的台站上的地面运动谱比值V/H有一定影响,且主要体现在中短周期范围内,例如平行断层方向的谱比值要比垂直断层方向的谱比值大。在下盘断层距3~20km的范围内,场地条件对V/H基本没有影响。2)在集集地震中长周期(>3s)部分的谱比值通常>32,且有一个较高的峰值,表明其竖向运动加速度中的长周期分量大于其它地震。3)对于下盘的台站,地面运动在短周期(<0.2s)段的谱比值不随断层距的增加而减少。与中远(>40km)距离的台站相比较,近断层台站的V/H在工程界关心的周期范围内普遍较大。4)场地条件对谱比值V/H的影响在近断层处不显著。在远离断层的东部台站上,硬土场地谱比值V/H在长周期段大于软土场地
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| 关 键 词： | 谱比值 近断层 地面运动 集集地震 场地条件 |
| 文章编号： | 0253-4967（2006）03-0325-11 |
| 收稿时间： | 2005-10-08 |
| 修稿时间： | 2006-04-05 |
A CASE STUDY ON NEAR FAULT VERTICAL TO HORIZONTAL RESPONSE SPECTRAL RATIO FROM THE 1999, CHI-CHI, TAIWAN, EARTHQUAKE |
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| ZHOU Xi-yuan,XU Ping,WANG Guo-quan,YAN Wei-ming.A CASE STUDY ON NEAR FAULT VERTICAL TO HORIZONTAL RESPONSE SPECTRAL RATIO FROM THE 1999, CHI-CHI, TAIWAN, EARTHQUAKE[J].Seismology and Geology,2006,28(3):325-335. |
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| Authors: | ZHOU Xi-yuan XU Ping WANG Guo-quan YAN Wei-ming |
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| Institution: | Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit, Institute of Earthquake Engineering and Disaster Reduction, Beijing University of Technology, Beijing 100022, China |
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| Abstract: | The vertical to horizontal response spectra ratio (V/H) for 68 near-fault records (R_ rup<20km) and 48 eastern coast records (403s) is commonly larger than 2/3, the usually estimated value in references, with a noticeable peak, which means the long period component of vertical movement in this case is larger than that of other earthquakes; 3) for recordings at footwall side, the V/H in short periods (<0.2s) do not obviously decrease as rupture distance increases. Comparing to stations having larger rupture distances (>40km), V/H of near fault stations are commonly larger in the concerned periods in engineering circle; 4) the influence of site conditions on the spectral ratio seems insignificant in near fault area. For the east stations with larger distance, the V/H in long period range at hard soil site is longer than that at soft soil site. |
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| Keywords: | spectral ratio near fault ground motion Chi-Chi Earthquake site condition |
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