Ray-theoretical seismic traveltime inversion: modifications for a two-dimensional radially parametrized Earth

Dynamic ray tracing and traveltime corrections for global seismic tomography

We present a dynamic ray tracing program for a spherically symmetric Earth that may be used to compute Fréchet kernels for traveltime and amplitude anomalies at finite frequency. The program works for arbitrarily defined phases and background models. The numerical precisions of kinematic and dynamic ray tracing are optimized to produce traveltime errors under 0.1 s, which is well below the data...

Seismic Traveltime Tomography 1

Improving global shear wave traveltime tomography using three-dimensional ray tracing and iterative inversion

S. Widiyantoro,1 A. Gorbatov,2 B. L. N. Kennett3 and Y. Fukao2 1Department of Geophysics and Meteorology, Bandung Institute of T echnology, Jl. Ganesha 10, Bandung 40132, Indonesia. E-mail: [email protected] 2Earthquake Research Institute, University of T okyo, Yayoi 1-1-1, Bunkyo-ku, T okyo 113, Japan 3Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, ...

Wave-equation traveltime inversion

This paper presents a new traveltime inversion method based on the wave equation. In this new method, designated as wave-equation traveltime inversion (WT), seismograms are computed by any full-wave forward modeling method (we use a finitedifference method). The velocity model is perturbed until the traveltimes from the synthetic seismograms are best fitted to the observed traveltimes in a leas...

3D joint inversion of seismic traveltime and gravity data: a case study

Joint inversion of different geophysical datasets is an effective way to eliminate non-uniqueness in geophysical inversion problems. In this paper, we focus on a case study of joint inversion of seismic traveltime and gravity observations. The results are encouraging and we can have confidence that, comparing traveltime tomography alone, joint inversion of seismic traveltime and gravity data im...