Research and Publications
- Ambient noise tomography
- Crust and upper mantle structure
- Nonlinear inversion
- Seismic Anisotropy
- Seismic Hazard Assessment in Community Velocity Models
Radial Anisotropy in the Earth's Crust
We are carrying out an anisotropic inversion of the dispersion maps generated by ambient noise tomography. Paper in preparation
Inversion for 3-D Shear-Velocity Structure of the Crust and Uppermost Mantle
We are carrying out an inversion of the dispersion maps generated by ambient noise tomography to produce an isotropic model of the crust and uppermost mantle in the western United States. The shear-velocity model may be used, alone and in conjuction with other models, to infer material properties of the crust and uppermost mantle beneath the western USA. Results are forthcoming.
Ambient noise tomography: Application
We have applied ambient noise tomography techniques to emerging data from the USArray Transportable Array to generate Rayleigh wave group and phase and Love wave phase velocity maps. Monthly processing is carried out to maintain a current inter-station Green's function data set. The data set is comprised of over 100,000 inter-station paths which we use to measure group and phase velocities and to generate dispersion maps between about 6 and 40 sec period.
Monthly and cumulative results are posted to our Ambient Noise Website
Ambient noise tomography: Technique development
We have summarized experiments and results in data processing for the calculation of inter-station Green's functions beginning with raw seismic data. Single-station pre-processing, as well as details of the cross-correlation calculation, are described.
- Lin, F., Moschetti, M.P., and Ritzwoller, M.H. (2008), Surface wave tomography of the western United States from ambient seismic noise: Rayleigh and Love wave phase velocity maps Geophys. J. Int., 111, B12310, doi:10.1111/j1365-246X.2008.03720.x (pdf)
- Yang, Y., Ritzwoller, M. H., Lin, F.-C., Moschetti, M. P., and Shapiro, N. M. (2008), Structure of the crust and uppermost mantle beneath the western United States revealed by ambient noise and earthquake tomography J. Geophys. Res., 111, B12310, doi:10.1029/2008JB005833 (pdf)
- Moschetti, M.P., Ritzwoller, M.H. and Shapiro, N.M. (2007), Surface wave tomography of the western United States from ambient seismic noise: Rayleigh wave group velocity maps Geochem. Geophys. Geosyst., 8, Q08010, doi:10.1029/2007GC001655. (pdf)
- Bensen, G.D., M.H. Ritzwoller, M.P. Barmin, A.L. Levshin, F. Lin, M.P. Moschetti, N.M. Shapiro, and Y. Yang (2007), Processing seismic ambient noise data to obtain reliable broad-band surface wave dispersion measurements, Geophys. J. Int., 169, 1239-1260 , doi: 10.1111/j.1365-246X.2007.03374.x (pdf)