Journal
EARTHQUAKE SCIENCE
Volume 24, Issue 1, Pages 55-64Publisher
SEISMOLOGICAL SOC CHINA & INST GEOPHYSICS, CHINA EARTHQUAKE ADMIN
DOI: 10.1007/s11589-011-0769-3
Keywords
ambient noise; Rayleigh wave; surface wave tomography
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Funding
- US National Science Foundation [EAR-0323309]
- NSF [EAR-0711526, EAR-0844097]
- Division Of Earth Sciences
- Directorate For Geosciences [0844097] Funding Source: National Science Foundation
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We discuss two array-based tomography methods, ambient noise tomography (ANT) and two-planewave earthquake tomography (TPWT), which are capable of taking advantage of emerging large-scale broadband seismic arrays to generate high resolution phase velocity maps, but in complementary period band: ANT at 8-40 s and TPWT at 25-100 s period. Combining these two methods generates surface wave dispersion maps from 8 to 100 s periods, which can be used to construct a 3D v(S) model from the surface to similar to 200 km depth. As an illustration, we apply the two methods to the USArray/ Transportable Array. We process seismic noise data from over 1 500 stations obtained from 2005 through 2009 to produce Rayleigh wave phase velocity maps from 8 to 40 s period, and also perform TPWT using similar to 450 teleseismic earthquakes to obtain phase velocity maps between 25 and 100 s period. Combining dispersion maps from ANT and TPWT, we construct a 3D vS model from the surface to a depth of 160 km in the western and central USA. These surface wave tomography methods can also be applied to other rapidly growing seismic networks such as those in China.
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