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.
|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|
|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
|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.|
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
- 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/
- Dziewonski, A.M., and D.L. Anderson. 1981. “Preliminary reference Earth model.” Phys. Earth Plan. Int. 25:297-356. https://doi.org/10.1016/0031-9201(81)90046-7.
- 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
- Model provided by Deborah Wehner
revision r0.0: uploaded March 14, 2022.