Time domain matching measurement process and characteristic analysis of tele-seismic P-wave attenuation factor t
Chen Yiping
Zhang Fengxue
Abstract：When using the time domain matching method to measure the attenuation factor,most of the exi-sting studies rely on the method of artificial vision to screen the benchmark waveform.This process lacks quantita-tive criteria,is susceptible to subjective bias,and has certain limitations.Based on the fact that teleseismic wave-forms recorded by multiple stations in the same network share nearly identical propagation paths,we propose a multi-level screening approach to progressively extract benchmark waveform with more detailed features from waveform records.By combining time-domain matching method with the multi-level screening approach,this pa-per further explores and refines the measurement process of the attenuation factor of the teleseismic waveform.Numerical experiments show that when is an excessively large positive value,the attenuated waveform becomes overly smoothed,with nearly all detailed features disappearing.Conversely,when is an excessively small nega-tive value,high-frequency noise obscures the dominant characteristics of the waveform,making it difficult to identify its intrinsic properties.Using observational data,this study validates the rationality and effectiveness of the multi-level screening approach by comparing it with previous results and testing different combinations of bench-mark waveforms.
Keywords：seismic wave attenuationtime-domain matching methodthe attenuation factort*teleseismic P-wave attenuation
Publication Date：2025-09-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 573-582 )