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Reconstruction of 3D Seismic Velocity Structures in West Java Obtained from Body-wave and Ambient Noise Tomography
Shindy Rosalia(a*), Sri Widiyantoro (b), Andri D. Nugraha (b), Tedi Yudistira (b), Phil R. Cummins (c)

(a) Graduate Program of Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung
*shindy.rosalia31[at]gmail.com
(b) Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung, Indonesia.
(c) Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia.


Abstract

Three-dimensional seismic velocity structure of crustal and upper mantle in West Java was reconstructed using the combination of body-wave and ambient noise tomography. We use P and S wave arrival data from nearly 1000 events to obtain a deeper (> 10 km), more regional velocity model and use ambient noise cross-correlation data from 75 temporal stations to obtain shallow (<10 km) velocity model with a higher resolution. The combination of both methods could give a comprehensive subsurface image of West Java, especially in the shallower part of northern West Java where there is a lack of body-wave raypath coverage. The seismic velocity structure obtained in this study could be very useful for understanding tectonic activity in the study area, which is important for earthquake disaster mitigation efforts in West Java. The three-dimensional seismic velocity could also be used as the input parameter of another seismological study, e.g. hypocenter determination.

Keywords: Body-wave tomography; Ambient noise tomography; West Java

Topic: Earth and Planetary Sciences

Link: https://ifory.id/abstract/yPMYBXnJTEct

Conference: Asian Physics Symposium (APS 2019)

Plain Format | Corresponding Author (Shindy Rosalia)

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