Abstract
We present a method for using any combination of body wave arrival time measurements, surface wave dispersion observations, and gravity data to simultaneously invert for three-dimensional P- and S-wave velocity models. The simultaneous use of disparate data types takes advantage of the differing sensitivities of each data type, resulting in a comprehensive and higher resolution three-dimensional geophysical model. In a case study for Utah, we combine body wave first arrivals mainly from the USArray Transportable Array, Rayleigh wave group and phase velocity dispersion data, and Bouguer gravity anomalies to invert for crustal and upper mantle structure of the region. Results show clear delineations, visible in both P- and S-wave velocities, between the three main tectonic provinces in the region. Without the inclusion of the surface wave and gravity constraints, these delineations are less clear, particularly for S-wave velocities. Indeed, checkerboard tests confirm that the inclusion of the additional datasets dramatically improves S-wave velocity recovery, with more subtle improvements to P-wave velocity recovery, demonstrating the strength of the method in successfully recovering seismic velocity structure from multiple types of constraints.
Original language | English |
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Pages (from-to) | 105-117 |
Number of pages | 13 |
Journal | Tectonophysics |
Volume | 718 |
DOIs | |
State | Published - Oct 30 2017 |
Funding
We thank the University of Utah Seismograph Stations and IRIS for providing the seismic data used in this study. Surface wave models are from ( Yang et al., 2008 ), and we thank Yingjie Yang and Weisen Shen for providing them. Gravity data were obtained from the Bureau Gravimétrique International. We also thank the Editor and the two reviewers for their thoughtful comments. This work was partly supported by the U.S. Department of Energy under contract DE-AC52-06NA25396/LA12-SignalPropagation-NDD2Ab with Los Alamos National Laboratory and contract DE-AC05-00OR22725 with Oak Ridge National Laboratory. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government. This work was also supported by the National Natural Science Foundation of China under grant 41474039 . We thank the University of Utah Seismograph Stations and IRIS for providing the seismic data used in this study. Surface wave models are from (Yang et al., 2008), and we thank Yingjie Yang and Weisen Shen for providing them. Gravity data were obtained from the Bureau Gravimétrique International. We also thank the Editor and the two reviewers for their thoughtful comments. This work was partly supported by the U.S. Department of Energy under contract DE-AC52-06NA25396/LA12-SignalPropagation-NDD2Ab with Los Alamos National Laboratory and contract DE-AC05-00OR22725 with Oak Ridge National Laboratory. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government. This work was also supported by the National Natural Science Foundation of China under grant 41474039.
Keywords
- Body waves, surface waves
- Crustal structure
- Gravity anomalies
- Seismic tomography
- Western United States