江苏省地震局,江苏 南京 210014
何斌(1985—),女,工程师。主要从事地球物理台网形变观测研究。E-mail:jsdz_hb@126.com
收稿:2020-04-16,
修回:2020-09-20,
纸质出版:2021-06-16
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何斌,苏泽云,章东等.VP型宽频带倾斜仪的同震响应衰减关系研究[J].防灾减灾工程学报,2021,41(03):650-656.
HE Bin,SU Zeyun,ZHANG Dong,et al.Study on the Attenuation Relationship of Co⁃seismic Responseon the VP Broadband Tiltmeter[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(03):650-656.
何斌,苏泽云,章东等.VP型宽频带倾斜仪的同震响应衰减关系研究[J].防灾减灾工程学报,2021,41(03):650-656. DOI: 10.13409/j.cnki.jdpme.202006023.
HE Bin,SU Zeyun,ZHANG Dong,et al.Study on the Attenuation Relationship of Co⁃seismic Responseon the VP Broadband Tiltmeter[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(03):650-656. DOI: 10.13409/j.cnki.jdpme.202006023.
基于徐州台和常熟台2套VP型宽频带倾斜仪记录到的186次同震形变波,统计分析其振幅-震级特征,分区对比研究其衰减关系,结合观测资料计算仪器特征参数,通过岩芯试验获取场地基岩性质,综合分析仪器观测效能。结果表明:(1)相比于常熟台,徐州台的NS向和EW向拟合均较为稳定,记震能力更好;(2)不同构造分区中拟合的振幅-震级关系,随着震中距增大,最大振幅幅值呈指数上升且拟合程度显著增强;(3)仪器基墩稳定性对同震响应存在一定的影响,基墩稳定性好,观测数据年零漂小,同震记录相对稳定;不同岩性的基墩对同震记录的敏感性存在差异,同震响应振幅与基墩弹性模量成反比。
Based on 186 co-seismic responses recorded by 2 sets of VP-type broadband tiltmeters in Xuzhou and Changshu stations, statistical analyses of the characteristics of amplitude – magnitude and attenuation relationship are conducted. The results show that (1) Compared with the Changshu station, the fitting of NS and EW directions of the Xuzhou station is relatively stable, having better seismic capacity; (2) According to the fitted amplitude - magnitude relationship in different tectonic structures, the maximum amplitude exponentially rises and the goodness of fit increases with the increase of epicentral distance. In addition, the characteristic parameters of the instrument were calculated based on the observed data, and the bedrock properties of the site were obtained through the core test. (3) The stability of the instrument base pier has a certain influence on the co-seismic response. The stability of the base pier is good, the observation data has a small annual drift, and the co-seismic record is relatively stable. The sensitivity of the piers of different lithologies to the co-seismic records is different, and the amplitude of the co-seismic response is inversely proportional to the elastic modulus of the piers.
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