北京地震台gPhone重力仪同震响应特征分析

Analysis of the characteristics of co­seismic response of gPhone gravimeter at Beijing seismic station

摘要:

地震的同震响应包含了地震破裂及传播过程中的大部分信息，因此可用这些同震信息对地震震源的一些参数进行估计。2014年9～12月，马鲁古海发生5次MS6.1～7.1强震，北京地震台的gPhone重力仪均有同震响应。本文从首波初至、地震频带响应、地震面波、同震变形幅度、同震持续时间等方面分析了重力仪的同震响应特征，并与STS-2宽频带地震计进行了波形对比分析。结果表明，相对于宽频带地震计，gPhone重力仪亦能提供丰富的由地震引起的地面运动信息，其首波初至、地震频带响应等与宽频带地震计有高度相似，且gPhone重力仪对长周期地震面波的响应很好，表现出其独有的特性。

Abstract:

5 strong earthquakes with MS6.1～7.1 occurred in the Molukka Sea，during the period of September～December,2014，and there were co-seismic responses of the gPhone gravimeter at the Beijing seismic station. In this paper，we study the characteristics of co-seismic response in 4 aspects：head wave，response of seismic band，deformation range，and co-seismic duration. In addition，the gPhone gravimeter response is compared with that of the STS-2 broadband seismometer. The results show that compared with the broadband seismometer，the gPhone gravimeter can also provide rich information of ground motion caused by the earthquake，and has its own characteristics.