S23C-2721
Seismic Structure of Southeast Asia from Full Waveform Seismic Ambient Noise Tomography

Tuesday, 15 December 2015
Poster Hall (Moscone South)
Erdinc Saygin, Australian National University, Canberra, ACT, Australia, Andreas Fichtner, ETH Swiss Federal Institute of Technology Zurich, Zurich, Switzerland, Phil R Cummins, Australian National University, Research School of Earth Sciences, Canberra, Australia and Masturyono Masturyono, Indonesian Agency for Meteorology, Climatology and Geophysics, Jakarta, Indonesia
Abstract:
We image the lower crust and upper-mantle structure of Southeast Asia with a 3D full waveform adjoint inversion scheme by directly inverting Green's functions retrieved from interstation seismic noise correlations.

Synthetic Green's functions are computed at a period range between 10 and 40 s to simulate the wave propagation in the region. Misfits between observed and synthetic waveforms are reduced by iteratively updating model parameters using sensitivity kernels with a conjugate-gradient optimization method. The final model is verified via comparing the simulated waveforms with the recorded earthquakes in the region. The balanced coverage of rays in the region enabled us to image complex structure. The Australian plate is characterized with higher velocities for most of the crust, where most of Indonesia, and its surroundings show complex structure with low velocities. The transition from the oceanic part of the Australian Plate to the continental crust adjacent to the Banda Arc is clearly imaged.

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