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DTSTAMP:20220812T074335Z
LOCATION:Singapore Room
DTSTART;TZID=Europe/Stockholm:20220628T163000
DTEND;TZID=Europe/Stockholm:20220628T170000
UID:submissions.pasc-conference.org_PASC22_sess149_msa154@linklings.com
SUMMARY:Using Full-Waveform Inversion (FWI) to Decipher Southeast Asia’s T
 ectonics
DESCRIPTION:Minisymposium\n\nUsing Full-Waveform Inversion (FWI) to Deciph
 er Southeast Asia’s Tectonics\n\nWehner, Rawlinson\n\nSeismic tomography h
 as played a crucial role in the illumination of deep Earth structure since
  the first pioneering studies of the mid 1970s. A wide range of tomographi
 c methods now exist, but these are mostly based on seismic ray theory and 
 hence do not fully account for the true physics of wave propagation. Full-
 waveform inversion (FWI) embraces the full complexity of seismic wave prop
 agation by accurately solving the 3-D seismic wave equation numerically. W
 hile computationally more expensive than ray-based imaging methods, FWI co
 herently incorporates the effects of anisotropy, wavefront healing, interf
 erence and (de)focusing, and is thus especially suitable for strongly hete
 rogeneous regions such as Southeast Asia.<br /><br />Based on >3,000 h of 
 analyzed waveform data, we image the seismic structure beneath Southeast A
 sia at periods between 20-150 s via an iterative non-linear inversion that
  begins from a 1-D reference model. At each iteration, the full 3-D wavefi
 eld is determined through an anelastic Earth using the spectral-element wa
 ve propagation solver <em>Salvus</em> (Afanasiev et al., 2019), accommodat
 ing effects of topography, bathymetry and ocean load. Our new model after 
 87 L-BFGS iterations reveals detailed anomalies down to the mantle transit
 ion zone, including multiple features associated with ongoing subduction, 
 particularly along the Indonesian volcanic arc.\n\nDomain: Climate, Weathe
 r and Earth Sciences, Computer Science and Applied Mathematics, Physics
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