Eikonal equation-based teleseismic traveltime tomography of Sumatra
Abstract
Complex and active tectonic environment in Sumatra has attracted many attentions in the past decades. We image the mantle structure to the depth of 1000 km by inverting high-quality seismic arrival time data using the newly developed eikonal equation-based teleseismic tomography software package. In this tomography package, we decompose the large-scale model (Sumatra, 94-108º E and -7-7º N) into small domains in order to reduce computation burden. Fast and efficiently calculation of seismic ray-path is allowed in MPI based parallel computation. Reliable cross correlation traveltime differences are extracted from the teleseismic waveforms recorded by 59 broadband stations during the period from January 2009 to January 2018. Both P- and S-wave tomographic results clearly show the general feature that Indo-Australian oceanic lithosphere obliquely subducts beneath the Sunda plate. The maximum penetration depth of the subducted slab into the mantle varies and slab dip angle changes drastically from north to south. Complex slab morphology is clearly revealed from our tomographic results.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMDI23B0041L
- Keywords:
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- 7208 Mantle;
- SEISMOLOGYDE: 8130 Heat generation and transport;
- TECTONOPHYSICSDE: 8162 Rheology: mantle;
- TECTONOPHYSICSDE: 8170 Subduction zone processes;
- TECTONOPHYSICS