Data Services Products: EMC-SASSY21 A 3-D seismic structural model of the lithosphere and underlying mantle beneath Southeast Asia

Summary

SASSY21 is a 3-D seismic structural model of the lithosphere and underlying mantle beneath Southeast Asia from full-waveform inversion – sometimes referred to as adjoint waveform tomography –, which was obtained using seismic data filtered at periods from 20 to 150 s.

Description

Name SASSY21
Title 3-D seismic structural model of the lithosphere and underlying mantle beneath Southeast Asia
Type 3-D Tomography Earth Model
Sub Type Full-waveform inversion
Year 2021
EMC Data Revision r0.0 (revision history)
 
Short Description   SASSY21 is a 3-D seismic structural model of the lithosphere and underlying mantle beneath Southeast Asia from full-waveform inversion – sometimes referred to as adjoint waveform tomography –, which was obtained using seismic data filtered at periods from 20 to 150 s. Synthetic seismograms were computed for an anelastic Earth using Salvus (Afanasiev et al., 2019), accommodating effects of topography, bathymetry and ocean load. The inversion parameters were restricted to those well-constrained by the intermediate-period waveform data, i.e. isotropic P-wave velocity (vP), radially anisotropic S-wave velocity (vSH and vSV) and density (⍴).
 
Authors: Deborah Wehner, Department of Earth Sciences, Bullard Laboratories, University of Cambridge, Cambridge, UK

Nienke Blom, Department of Earth Sciences, Bullard Laboratories, University of Cambridge, Cambridge, UK

Nicholas Rawlinson, Department of Earth Sciences, Bullard Laboratories, University of Cambridge, Cambridge, UK

Daryono, Indonesian Agency for Meteorology, Climatology
Geophysics (BMKG), Jakarta, Indonesia

Christian Böhm, ETH Zürich, Zurich, Switzerland and Mondaic AG, Zurich, Switzerland

Meghan S. Miller, Australian National University, Canberra, Australia

Pepen Supendi, Department of Earth Sciences, Bullard Laboratories, University of Cambridge, Cambridge, UK
Indonesian Agency for Meteorology, Climatology, and Geophysics (BMKG), Jakarta, Indonesia

Sri Widiyantoro, Faculty of Mining and Petroleum Engineering, Global Geophysics Research Group, Institut Teknologi Bandung, Bandung, Indonesia
Faculty of Engineering, Maranatha Christian University, Bandung, Indonesia
 
Previous Model
 
Reference Model We adopt CSEM – Generation 1 (Fichtner et al., 2018) as a starting model. No region-specific model was available for Southeast Asia and thus, CSEM is essentially a modified version of the anisotropic PREM (Dziewoński & Anderson, 1981), e.g. the Lehmann discontinuity was replaced by a linear gradient and the elastic properties of the lower crust have been extended to the surface.
 
Usage Notes   The model files provide the following absolute values of the final model SASSY21: vP, vSH, vSV, vS, ⍴, Qκ and Qμ. Note that the inversion parameters are restricted to vSH, vSV, vP and ⍴.
 
Model Download SASSY21.r0.0-n4.nc is the pre-gridded model in the netCDF 4 Classic format (metadata).
The SASSY21 model in HDF5 and CSV formats, and the filtered waveforms to allow reproduction of our results can be found on a Zenodo repository.
 
Depth Coverage 0 to 800 km
 
Area Southeast Asia (latitude -15°, 15°, longitude 92°, 140°)
 
Data Set Description SASSY21 is defined by both P-wave and S-wave structure, and constrained by inversion of both body and surface waveforms. This is achieved through the application of full-waveform inversion to a large regional dataset, which comprises > 3,000 h of analyzed waveform data gathered from ~13,000 unique source-receiver pairs.
 
 

Shear-wave velocity 200 km
Shear-wave velocity (Vs) in SASSY21 at 200 km depth. Perturbations are in % relative to the depth-average.

Citations and DOIs

To cite the original work behind this Earth model:

  • Wehner, D., Blom, N., Rawlinson, N., Daryono, Böhm, C., Miller, M. S., Supendi, P., & Widiyantoro, S. (2021). SASSY21: A 3‐D seismic structural model of the lithosphere and underlying mantle beneath Southeast Asia from multi‐scale adjoint waveform tomography. Journal of Geophysical Research: Solid Earth, e2021JB022930. https://doi.org/10.1029/2021JB022930

To cite IRIS DMC Data Products effort:

  • Trabant, C., A. R. Hutko, M. Bahavar, R. Karstens, T. Ahern, and R. Aster (2012), Data Products at the IRIS DMC: Stepping Stones for Research and Other Applications, Seismological Research Letters, 83(5), 846–854, https://doi.org/10.1785/0220120032.

DOI for this EMC webpage: https://doi.org/10.17611/dp/emc.2022.sassy21.1

References

  • Afanasiev, M., Boehm, C., van Driel, M., Krischer, L., Rietmann, M., May, D. A., et al. (2019). Modular and flexible spectral-element waveform modelling in two and three dimensions. Geophysical Journal International, 216(3), 1675–1692. https://doi.org/https://doi.org/10.1093/gji/ggy469
  • Fichtner, A., van Herwaarden, D.-P., Afanasiev, M., Simutė, S., Krischer, L., Çubuk-Sabuncu, Y., et al. (2018). The collaborative seismic Earth model: Generation 1. Geophysical Research Letters, 45(9), 4007–4016. https://doi.org/10.1029/2018gl077338

Credits

  • Model provided by Deborah Wehner

Revision History

revision r0.0: uploaded March 14, 2022.

Timeline

2022-03-15
online

Categories

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