福建测震台网单台震级偏差与台站场地响应关系的初步分析

Preliminary analysis of the relationship between the magnitude deviation of the station and the site response in Fujian Digital Seismic Network

摘要:

利用福建测震台网2008年10月~2015年12月记录的每个事件至少有6个台站测算震级的3069个区域地震事件，进行单台震级与台网平均震级的偏差统计，获得了各台站的总的震级平均偏差为-0.31~0.68，并统计各台站测算震级所量取最大记录振幅相应的周期，获得优势周期为0.06~0.38s；通过Moya方法反演各测震台站的场地响应，获得98个台站对1~20Hz频带的场地响应，结果显示场地对某些频带信息有放大或抑制作用；通过比较Wood-Anderson地震仪摆固有0.8s周期所对应的场地响应、各台样本优势周期所对应场地响应的震级偏差与各台总的震级平均偏差，发现台站测算震级相应优势周期的场地响应的震级偏差与台站震级平均偏差有较好的线性关系，表明单台震级的偏差与测算震级所量取最大记录振幅相应的周期的场地响应有较大关系。

Abstract:

On the basis of 3069 region earthquake events recorded by the Fujian Digital Seismic Network from October,2008 to December,2015,we calculated the deviations of the single station magnitude and the average magnitude of the network,and found that the magnitude of the average deviation of each station was -0.31~0.68. We also calculated the period time for magnitude measurements,and found that the advantageous period time was 0.06~0.38s. The site response inversion of each seismic station by the Moya method reveals that 98 stations responded to 1~20Hz band,and had an amplifying or inhibiting effect on certain frequency band information. The comparison of the 0.8s magnitude deviation of Wood-Anderson pendulum seismograph with the average magnitude deviation of the each station shows that there was a good linear relationship between the magnitude deviation of the advantageous period time site response. The result shows that the average magnitude deviation of a single station had a close relationship with the site response of the corresponding period of magnitude amplitude.