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 .
出处
《地震学报》
CSCD
北大核心
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.
关键词
MORLET小波
小波变换比
初至震相
初至到时
信噪比
Morlet wavelet
wavelet transformation ratio
first arrival phase
first arrival-time
signal to noise ratio
