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WITHDRAWN High Frequency Seismic Waves of Normal and Leaky Modes Excited by Heavy Trains

Description: 

WITHDRAWN Ambient seismic noise tomography has far-reaching applications from shallow sub-surface, regional, continental to global imaging scales over the past two decades. Recently, some individuals have successfully extracted both normal-mode and leaky-mode dispersion curves from high frequency seismic ambient noise recorded by dense seismic arrays using the frequency-Bessel (F-J) transform. These findings obtain more reliable Vs and Vp models by simultaneously fitting these two types of dispersion data, since normal-mode dispersion curves are more sensitive to Vs than Vp while leaky-mode dispersion curves are opposite. The influence factors, like the excitation sources and seismic velocity model, however, are not analyzed systematically in previous researches. Here we collect ambient noise recordings from a two-km long linear-shape seismic array laying along a railway track in New Mexico, the United States of America to process for obtaining hourly high-quality dispersion data by the F-J transform array stacking technique. We show that there is a strong positive correlation between the signal to noise ratios of dispersion curves of normal and leaky modes and the train traffic volume. This result tells us that we need to make full use of seismic noise generated by trains or even trucks to investigate the subsurface Vs and Vp structure utilizing dispersion data of normal and leaky modes, facilitating new findings for civil engineering.

Session: From Earthquake Recordings to Empirical Ground-Motion Modelling [Poster Session]

Type: Poster

Date: 5/2/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Xuping

Student Presenter: No

Invited Presentation: 

Authors