利用兰州小孔径地震台阵资料叠加观测走时曲线  

Observed travel-time curves by stacking records from Lanzhou small aperture seismic array

作　　者：秦满忠[1,2] 沈旭章[1,2] 张元生[1,2] 刘旭宙[1,2] 

机构地区：[1]中国地震局兰州地震研究所,中国兰州730000 [2]中国地震局地震预测研究所兰州科技创新基地,中国兰州730000

出　　处：《地震学报》2014年第1期59-69,共11页Acta Seismologica Sinica

基　　金：中国地震局地震预测研究所基本科研业务专项(2012IESLZ09;2012IESLZ03)共同资助

摘　　要：使用兰州小孔径地震台阵记录的近10年地震观测垂直分量波形数据,采用长、短时间平均数比值方法(STA/LTA)叠加出适用于青藏高原东北缘地区的观测走时曲线.结果表明,兰州小孔径地震台阵独特的地理位置,基本上能够记录到不同震中距(0—180°)和不同方位的地震事件;使用不同频率滤波处理之后的地震数据记录叠加出相应的观测走时曲线,从观测走时曲线中可以识别出不同体波震相(P,PKIKP,PKP,PP,PPP,PcP,ScP,S,SS等)的到时及其观测走时曲线特征.这对识别地震各种震相,认识和研究地球内部精细结构等具有非常重要的科学意义.Abstract： Based on the past 10 years vertical observational waveforms recorded by Lanzhou small aperture seismic array, which is located at the northeastern margin of the Tibetan Plateau, the observed travel-time curves are obtained by using STA/LTA technique. The results show that Lanzhou seismic array can record events with different epicentral distances between 0--180° and with dif- ferent azimuths due to its particular location. By stacking the seismic records filtered with different frequencies, we can get corresponding observed travel- time curves so as to identify different body wave phases, such as P, PKIKP, PKP, PP, PPP, PcP, ScP, S, SS, and to study the characteristics of travel- time curves. It is of scientific significance to identify various seismic phases and further study fine structure of the Earth＇s interior.

关 键 词：观测走时曲线 小孔径地震台阵 长短窗能量比叠加 

分 类 号：P315.61[天文地球—地震学]