Ambient Noise Tomography for Determining the Velocity Model of Rayleigh Wave in Java Island, Indonesia

International Journal of Applied Physics

© 2018 by SSRG - IJAP Journal

Volume 5 Issue 1

Year of Publication : 2018

Authors : Muhajir Anshori, Sukir Maryanto, Tri Deni Rahman,Azwar Panshori

10.14445/23500301/IJAP-V5I1P103

How to Cite?

Muhajir Anshori, Sukir Maryanto, Tri Deni Rahman,Azwar Panshori, "Ambient Noise Tomography for Determining the Velocity Model of Rayleigh Wave in Java Island, Indonesia," SSRG International Journal of Applied Physics, vol. 5,  no. 1, pp. 9-13, 2018. Crossref, https://doi.org/10.14445/23500301/IJAP-V5I1P103

Abstract:

Ambient Noise Tomography had been applied to describe the Rayleigh wave group velocity model in the crust of Java Island, Indonesia. The collected seismic data consist of vertical component that recorded in January to December 2011 from 12 seismic stations at Indonesia Tsunami Early Warning System (INA TEWS) BMKG network Seismograph in Java Island. The waveform data processing was conducted from the preparation stage of daily waveform data, signal conditioning to signal cross correlation between paired stations that produced the empirical green function of the medium where the signal propagated. The estimated travel time of Rayleigh wave group for both periods of 5 s and 20 s were obtained from the time delay of the cross correlation. There were obtained by 36 and 22 traces respectively. The tomography process was conducted by using FMST v1.1 where forward and inverse modeling performed iteratively. The modeling result for the period of 5 s shown that the distribution of negative anomalies corresponded to volcanoes and Inter-Volcano plains which were Quarter-old. For period of 20 s, the western part of Java Island had a lower velocity anomaly than the eastern Java. This indicated that the tectonic activity of the western Java was more complex.

Keywords:

tomography, ambient noise, crosscorrelation, Rayleigh

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