渭河断陷盆地及邻近地区的Q值速度场分布特征与地震活动性

Distributions of Q Value and Seismic Velocity and Seismicity Beneath Weihe Fault Depression and Its Adjacent Areas

利用西安数字遥测地震台网记录的数字地震资料,采用P波初动半周期方法,得到了渭河断陷盆地及邻近地区的Q值分布。结果表明,Q值分布与20km深度P波速度分布有较好的一致性,并与该区域的地震活动性密切相关。

In this paper, by using the seismic data recorded by xi'an digital telemetry seismic network, from studying half period of first P arrivals,Q value distribution beneath Weihe fault depression basin and its adjacent area is determined. The results show that the distribution of Q value is comparatively consistent with the image of P-wave velocity distribution at depth h=20 km in the studied area ,and is closely related to seismicity in this region.