倾斜固体潮及其组合信息与强震响应特征分析  

Analysis of the correlation between the characteristics of the tilt tide and strong earthquake

作　　者：苏维刚[1] 马震[1] 冯丽丽[1] 赵玉红[1] 孙玺皓 SU Weigang;MA Zhen;FENG Lili;ZHAO Yuhong;SUN Xihao(Qinghai Earthquake Administration,Xining 810001,China)

机构地区：[1]青海省地震局,青海西宁810001

出　　处：《浙江大学学报（理学版）》2020年第4期484-491,共8页Journal of Zhejiang University（Science Edition）

基　　金：青海省地震科技基金资助项目(2020A08).

摘　　要：采用格尔木和湟源倾斜数据计算倾斜固体潮潮汐因子及其组合信息,分析发现,倾斜M2波和O1波潮汐因子比值的不同离散程度对所处区域的应力水平和方向具有较好的指示意义。结合6级以上地震,进一步讨论了固体潮及其组合信息与强震之间的响应特征,得到:倾斜潮汐因子对6级以上地震响应较好,且主要为具有中短期预报意义的震前响应和同震响应。而在倾斜潮汐因子组合信息中,介质各向异性主要在震前4~5个月出现异常,剪切应变在震前1~7个月出现异常,面膨胀因子主要在震前1个月或震时显著增大,处于不同区域的倾斜潮汐因子组合信息对于强震的响应率并不相同。This article uses the tilt data of Golmud and Huang Yuan to compute the tilt tidal factors and their combination. It is found that different dispersion of the ratio between M2 and O1 wave tide factors has a good indicatory meaning to the area’s stress level and stress direction. Then, the correlation between the tilt tide factor’s and strong earthquake are further discussed. It is found that the tilt tidal factors got good response on the earthquake(Ms≥6) which mainly includes precursory anomaly for medium and short term earthquake precursors and coseismic response. For the combination information of tilt tidal factors, it shows that seismic anisotropy are mainly abnormal in four to five months before the earthquake. The shear strain are mainly abnormal in one to seven months before the earthquake. The expansion factor is significantly increased in one month before the earthquake or during the earthquake. On the other hand, the combination information of tilt tidal factors in different regions have different response rate for strong earthquake.

关 键 词：倾斜潮汐因子 组合信息 强震 响应率 

分 类 号：P65[天文地球—地质学]