利用集集地震余震记录分析场地地震动反应

doi:10.7523/j.issn.2095-6134.2009.3.012

中国科学院大学学报 ›› 2009, Vol. 26 ›› Issue (3): 373-382.DOI: 10.7523/j.issn.2095-6134.2009.3.012

利用集集地震余震记录分析场地地震动反应

欧阳行艳, 章文波, 张有兵

中国科学院研究生院计算地球动力学重点实验室, 北京 100049

收稿日期:2008-07-14 修回日期:2008-09-09 发布日期:2009-05-15
通讯作者: 章文波
基金资助:
国家自然科学基金项目(40574023)和中国科学院百人计划项目资助 

Estimation on site effect from different techniques using aftershocks of Chi-Chi earthquake

OUYANG Xing-Yan, ZHANG Wen-Bo, ZHANG You-Bing

Key Laboratory of Computational Geodynamics, Graduate University of the Chinese Academy of Sciences, Beijing 100049,China

Received:2008-07-14 Revised:2008-09-09 Published:2009-05-15

摘要/Abstract

摘要：

利用1999年台湾地区"921集集大地震"的余震记录,用传统谱比法、线性反演法、S波接收函数法和遗传算法对比分析了车笼埔断层近场区域的场地反应.通过对比4种方法的卓越频率和场地放大因子,发现各种方法能给出较一致的卓越频率,但每种方法的场地反应放大值不完全相同.结果表明,线性反演法与传统谱比法的结果受到参考场自身场地反应的影响;遗传算法作为一种绝对场地反应计算方法其结果是可行的,用遗传算法计算得到的参考场结果对线性反演法结果进行校正,校正后的线性反演法与遗传算法结果非常吻合,也证明了遗传算法结果的可行性,建议推广遗传算法来计算场地反应;接收函数法的结果则同其他3种方法的结果相差较大,考虑到运用强震记录进行H/V方法计算的物理机制仍有争议,建议在实际应用中,慎重考虑应用S波H/V的方法来估计场地放大.最后给出车笼埔断层研究区0.4~20Hz频率范围内S波品质因子值为Q_s=69.7f?^0.73.

关键词: 场地反应, 集集地震, 参考场, 卓越频率, 放大因子

Abstract:

Site effects are analyzed for the Chelongpu fault area using the aftershock strong-motion data of the 1999 Chi-Chi, Taiwan, earthquake. Four techniques are used including traditional spectral ratios of S wave, generalized inversion technique, receiver function of S wave and genetic algorithm. Our results show that the predominant frequencies for each site estimated by these four methods are almost the same. However, the site amplifications for each site obtained by these methods have some differences. The results of generalized inversion technique and the traditional spectral ratio method are affected by the reference site. After corrected by the site effect of the reference site obtained by genetic algorithm, the corrected results of the generalized inversion technique agree well with the results of genetic algorithm. This shows that genetic algorithm is a reasonable technique to estimate the absolute site effect for a site. In this study, usually, the site amplification obtained by the method of the receiver function is larger than other three techniques. Considering there are still many unclear issues in this method, we suggest that one should be very careful when using receiver function to estimate the site effect. Finally, we gave the Q_S-value calculated by generalized inversion technique. It is frequency dependent, Q_S=69.7f?^0.73, in the range of frequency 0.4~20Hz.

Key words: site effects, Chi-Chi earthquake, reference site, predominant frequency, genetic algorithm

中图分类号:

P315.9

欧阳行艳, 章文波, 张有兵. 利用集集地震余震记录分析场地地震动反应[J]. 中国科学院大学学报, 2009, 26(3): 373-382.

OUYANG Xing-Yan, ZHANG Wen-Bo, ZHANG You-Bing. Estimation on site effect from different techniques using aftershocks of Chi-Chi earthquake[J]. , 2009, 26(3): 373-382.

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利用集集地震余震记录分析场地地震动反应

Estimation on site effect from different techniques using aftershocks of Chi-Chi earthquake

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