利用定尺度小波变换比方法测量远震极远震P和PKIKP震相到时  

ARRIVAL TIME MEASUREMENTS OF FIRST PHASES P AND PKIKP USING THE METHOD OF FIXED SCALE WAVELET TRANSFORMATION RATIO

作　　者：何小波[1] 周蕙兰[1] 

机构地区：[1]中国科学院研究生院计算地球动力学重点实验室,中国北京100049

出　　处：《地震学报》2005年第4期385-393,共9页Acta Seismologica Sinica

基　　金：国家自然科学基金(40074007)资助.

摘　　要：许多起始缓慢的震相的到时不易测量准确,人眼测量的到时往往偏后.本文对定尺度Morlet小波变换比方法加以改善和简化之后,测量了50条远震和极远震记录的初至震相P和PKIKP的到时.在对结果的合理性和误差进行分析讨论的基础上,肯定了该方法的有效性.The arrival- times of first teleseismic phases are difficult to be measured precisely because of slowly and gradually changed onsets and weak amplitudes. The arrival times measured manually are usually behind the real ones. In this paper, using the ratio method of fixed scale wavelet transformations improved by us, the arrival times for the first arrival phases (such as P and PKIKP) at the teleseismic and far-teleseimic distances were measured. The results are reasonable and reliable based on the analysis and discussion of the reliabilities and errors .

关 键 词：MORLET小波 小波变换比 初至震相 初至到时 信噪比 

分 类 号：P315.31[天文地球—地震学]