甘肃东部及邻区地壳Qp值分布特征

DISTRIBUTION CHARACTERISTICS OF CRUSTAL QP VALUES IN AND AROUND THE EASTERN AREA OF GANSU PROVINCE

摘要:

本文使用兰州遥测地震台网有数字波形记录的12个台站记录到的83个近震P波资料,应用波谱计算Q_P值的频率域方法,求得甘肃东部及邻区Q_P值在170-1300之间。通过分析发现低Q_P区小震活动密集,中强地震较多;高Q_P区地震活动最弱;在高Q_P区和低Q_P区的边界一带,是历史和现今6级以上破坏性地震发生区。文中最后应用组合模式,对Q_P值的分布进行了分析,并对甘肃东部某些地区的地震危险性作了估计。

Abstract:

In this paper, based on the 291 P-wave data of 83 local earthquakes recorded from the 12 digital stations of the Telemetered Seismic Network of Lanzhou, the crustal Q_p values in and around the eastern area of Gansu Province are obtained, ranging from 170 to 1300. by using the spectrum method in frequency domain. The results show that small and moderately strong earthquakes centered in the low Q_p region. but the seismicity was keeping the lowest active level in the high Q_p region:the large destructive earthquakes (M ≥ 6) occurred on the boundary between the low Q_p and high Q_p region. Finally, it analyses the Q_p-value distribution by using the combination model, and gives a hazard estimation of potential earthquake in this area.