闽粤地区同震形变波记录序列分析及小波能谱特征

发布时间：2018-05-06 20:58

  本文选题：同震形变 + 闽粤地区　； 参考：《大地测量与地球动力学》2017年12期

【摘要】：基于闽粤地区10个地形变观测点40个测项的同震形变波记录,利用幅度比值和小波多尺度分析方法探讨其记录特点和传导机制,结果显示:1)同震形变波到时与震中距有关,波形记录含有d-P和d-S波,不同测项记录到的波形不一致,同测项的记录波形相似;2)幅度比值在一定程度上与震源方位有关,进一步反映其各向异性;3)通过互(自)相关计算和滤波处理,能识别出同震形变波的频带为0.02~0.04 Hz,峰值在0.025Hz附近;4)智利地震形变波序列小波能谱为64~254s,能量集中在128~254s;而尼泊尔地震形变波在不同测点区别较大,潮州台为16~32s,厦门台为16~64s。研究结果表明,形变记录中除面波外还包含体波成分,不同震源机制引起的同震形变波传导机制可能存在各向异性,这对于开展地震引发应变等研究有借鉴意义。
[Abstract]:Based on 40 coseismic deformation wave records of 10 topographic deformation observation points in Fujian and Guangdong, the characteristics and conduction mechanism of coseismic deformation wave are discussed by using amplitude ratio and wavelet multiscale analysis method. The results show that the arrival time of coseismic deformation wave is related to epicentral distance. The waveform record contains d-P and d-S waves, and the waveform recorded by different items is inconsistent. The amplitude ratio of the recorded waveform of the same item is similar to that of the source to a certain extent, which is related to the location of the source. Further reflecting its anisotropy 3) through mutual (autocorrelation) calculation and filtering, The frequency band of coseismic deformation wave is 0.02 ~ 0.04 Hz and the peak value is near 0.025Hz.) the wavelet spectrum of Chile seismic deformation wave sequence is 64 ~ 254s, and the energy is concentrated at 128m ~ 254s, while the seismic deformation wave of Nepal is different from other seismic deformation waves at different measuring points, which is 16 ~ 32s in Chaozhou station and 1664s in Xiamen station. The results show that the deformation records contain bulk wave components in addition to surface waves, and anisotropy may exist in the co-seismic deformation wave conduction mechanism caused by different focal mechanisms, which is useful for the study of earthquake induced strain.
【作者单位】： 广东省地震局汕头地震台;中国地震台网中心;
【基金】：国家自然科学基金(41374080)~~
【分类号】：P315.7
，

本文编号：1853855