@article{94dc19e9d7f1463cb84f483172a492ac,
title = "TX2019slab: A New P and S Tomography Model Incorporating Subducting Slabs",
abstract = "Large numbers of earthquakes occur in subduction zones that are marked by dipping, narrow high seismic velocity slabs. The existence of these fast velocity slabs can cause serious earthquake mislocation problems that can bias estimates of seismic travel time residuals. This can affect the recovery of subducting slabs in tomography as well as introduce significant artifacts into lower mantle structure in tomography models. In order to better account for known subducting slabs, we performed a new P and S wave joint tomography inversion incorporating a three-dimensional thermal model of subducting slabs in the starting model. In addition, velocity and source locations were inverted for simultaneously. Our new P and S models feature higher-amplitude subducting slabs compared with previous global tomography results. The S to P heterogeneity ratio based on the new tomography model indicates that thermal elastic effects alone cannot explain all the heterogeneities in the lower mantle. Much of the observed abnormal S to P heterogeneity ratio can be explained by anelastic effects, the spin transition, and phase transitions of bridgmanite to post-perovskite in the lower mantle.",
keywords = "Anelasticity, Earthquake Mislocation, Post-perovskite, Seismic Tomography, Spin Transition, Subducting Slab",
author = "Chang Lu and Grand, {Stephen P.} and Hongyu Lai and Garnero, {Edward J.}",
note = "Funding Information: The TX2019slab model is available at IRIS EMC website (http://ds.iris.edu/ds/products/emc-earthmodels/). We thank ISC (International Seismological Centre, http://www.isc.ac.uk/isc-ehb/), IRIS DMC (Incorporated Research Institutions for Seismology, Data Management Center, https://ds.iris.edu/ds/nodes/dmc/), ORFEUS (Observations & Research Facilities for European Seismology, https://www.orfeus-eu.org/), NECDC (Northern California Earthquake Data Center, http://ncedc.org/), F-net (F-net Broadband Seismograph Network, http://www.fnet.bosai.go.jp/), and CNSN (Canadian National Seismic Network, http://www.earthquakescanada.nrcan.gc.ca/stndon/CNDC/) for providing seismic data used in this study. We thank Georg Stadler, Michael Gurnis, and Ellen Syracuse for providing thermal slab model. We also thank Nathan Simmons, Alessandro Forte, Jung-Fu Lin, Thorsten Becker, and Suyu Fu for the valuable discussions. This research was supported by National Science Foundation (NSF) grants EAR-1648770 and EAR-1648817 and by the Jackson School of Geosciences at the University of Texas at Austin. Funding Information: The TX2019slab model is available at IRIS EMC website ( http://ds.iris.edu/ds/products/emc‐earthmodels/ ). We thank ISC (International Seismological Centre, http://www.isc.ac.uk/isc‐ehb/ ), IRIS DMC (Incorporated Research Institutions for Seismology, Data Management Center, https://ds.iris.edu/ds/nodes/dmc/ ), ORFEUS (Observations & Research Facilities for European Seismology, https://www.orfeus‐eu.org/ ), NECDC (Northern California Earthquake Data Center, http://ncedc.org/ ), F‐net (F‐net Broadband Seismograph Network, http://www.fnet.bosai.go.jp/ ), and CNSN (Canadian National Seismic Network, http://www.earthquakescanada.nrcan.gc.ca/stndon/CNDC/ ) for providing seismic data used in this study. We thank Georg Stadler, Michael Gurnis, and Ellen Syracuse for providing thermal slab model. We also thank Nathan Simmons, Alessandro Forte, Jung‐Fu Lin, Thorsten Becker, and Suyu Fu for the valuable discussions. This research was supported by National Science Foundation (NSF) grants EAR‐1648770 and EAR‐1648817 and by the Jackson School of Geosciences at the University of Texas at Austin. Publisher Copyright: {\textcopyright}2019. American Geophysical Union. All Rights Reserved.",
year = "2019",
month = nov,
day = "1",
doi = "10.1029/2019JB017448",
language = "English (US)",
volume = "124",
pages = "11549--11567",
journal = "Journal of Geophysical Research: Solid Earth",
issn = "2169-9313",
publisher = "Wiley-Blackwell",
number = "11",
}