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| Surface wave tomography on a large-scale seismic array combining ambient noise and teleseismic earthquake data |
| Yingjie Yang1, Weisen Shen2, Michael H. Ritzwoller2 |
1 GEMOC ARC National Key Centre, Department of Earth and Planetary Sciences, Macquarie University, North Ryde, NSW 2109, Australia
2 Department of Physics, University of Colorado at Boulder, Boulder, CO 80303, USA |
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Abstract 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 vS model from the surface 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 ~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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Received: 21 September 2010
Published: 10 February 2011
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| Fund:NSF under grants EAR-0711526 and EAR-0844097 and also by Macquarie University CORES start-up grant to Y. Yang |
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Corresponding Authors:
Yingjie Yang
E-mail: yingjie.yang@mq.edu.au
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