| 浙江地区Lg波路径衰减关系及 台站场地响应参数 |
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| 引用本文： | 于俊谊,朱新运.浙江地区Lg波路径衰减关系及 台站场地响应参数[J].地震学报,2016,38(1):103-110. |
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| 作者姓名： | 于俊谊 朱新运 |
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| 作者单位： | 中国杭州 310013 浙江省地震局 |
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| 基金项目： | 测震台网青年骨干培养专项20130207中国地震局星火计划攻关项目XH12023 |
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| 摘 要： | 基于浙江省数字地震台网2007—2012年记录的台湾地区355次MS≥4.0地震的波谱比数据， 使用场地响应与路径衰减联合反演的方法， 对穿越台湾海峡特定路径的Lg波衰减关系及浙江地区36个测震台站的场地响应参数进行了计算. 计算中选取频率为1—7 Hz、 间隔为0.2 Hz， 计算得到了三分向(U--D， N--S, E--W)的衰减关系及场地响应参数. 三分向衰减参数关系为γUD(f)=0.0055f0.94， γNS(f)=0.0064f1.11和γEW(f)=0.0048f0.90. 浙江地区36个台站均获得了稳定的场地响应， 其中庆元台在高频端表现出较明显的放大效应, 其它台站在所研究的频率范围内各分向场地响应大致相当， 并未显示出明显的方向性特征. 最后对场地响应的异常部分进行了具体分析和验证， 表明本文计算结果正确可靠.
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| 关 键 词： | Lg波 场地响应 路径衰减 联合反演 波谱 |
| 收稿时间： | 2015-05-21 |
Lg-wave attenuation relationship and site response of stations in Zhejiang area |
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| Affiliation: | Earthquake Administration of Zhejiang Province, Hangzhou 310013, China |
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| Abstract: | Based on the spectral ratio data， the Lg-wave attenuation relationship along a specific path across Taiwan Strait and the site response from 36 stations in Zhejiang area were calculated by using the joint inversion method of field response and the path attenuation. We used the data of 355 MS≥4.0 earthquakes during the period of 2007—2012, which were recorded by Zhejiang digi-tal seismic network in Taiwan region. During the calculation process， the data in the frequency range of 1—7 Hz were selected with the interval of 0.2 Hz. The attenuation relationships are γUD(f)=0.0055f0.94， γNS(f)=0.0064f1.11 and γEW(f)=0.0048f0.90 in U--D， N--S and E--W direction. The site response at high-frequency end of Qingyuan station showed an obvious amplification effect， meanwhile， the site response of the other 35 stations are nearly equal without obvious direction characteristic. Furthermore， the abnormal results were analyzed and verified， suggesting the results in this paper be correct and reliable. |
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