Short-Period Surface-Wave Tomography in the Continental United States – A Resource for Research
Dates
Publication Date
2021-09-01
Start Date
2010-01-01
End Date
2021-01-01
Citation
Harley M. Benz, 2021, Short-Period surface-wave tomography in the continental United States – A resource for research, U.S. Geological Survey data release, https://doi.org/10.5066/P9ZW08I1
Summary
The variation of Love/Rayleigh phase and group velocity was determined for the continental U. S. and adjacent Canada. By processing ambient noise from the broadband channels of the Transportable Array (TA) of USArray and several PASSCAL experiments and using some earthquake recordings, the effort was focused toward determining dispersion down to periods as short as 2s. The relatively short distances between TA stations permitted the use of a 25 km x 25 km grid for the four independent tomographic inversions (Love/Rayleigh and Phase/group velocity). One reason for trying to obtain short period dispersion was to have a data set capable of constraining upper crust velocity models for use in determining regional moment tensors. The benefit [...]
Summary
The variation of Love/Rayleigh phase and group velocity was determined for the continental U. S. and adjacent Canada. By processing ambient noise from the broadband channels of the Transportable Array (TA) of USArray and several PASSCAL experiments and using some earthquake recordings, the effort was focused toward determining dispersion down to periods as short as 2s. The relatively short distances between TA stations permitted the use of a 25 km x 25 km grid for the four independent tomographic inversions (Love/Rayleigh and Phase/group velocity). One reason for trying to obtain short period dispersion was to have a data set capable of constraining upper crust velocity models for use in determining regional moment tensors. The benefit of focusing on short period dispersion is apparent in the tomography maps—shallow geologic structures are imaged, such as the Mid-Continent Rift, and the Michigan, Illinois, Anadarko, Arkoma, and Appalachian Basins. In our processing, we noted that the phase velocities were more robustly determined than the group velocities. We also noted that the inability to obtain dispersion at short periods shows distinct regional patterns that may be related to local upper crust structure.
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Related External Resources
Type: Publication that references this resource
Herrmann, R.B., Ammon, C.J., Benz, H.M., Azziz-Zanjani and Boschelli, J. (2021). Short-Period Surface-Wave Tomography in the Continental United States-A Resource for Research, Seismological Research Letters, 92(6), 3642-3656
This is a unique dataset of surface wave observations for the continental United States that have a variety of uses in earthquake hazard assessment research.
