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| Crustal S-wave velocity structure of the Yellowstone region using a seismic ambient noise method |
| Yan Lü1, Sidao Ni2, Jun Xie3, Yingjie Xia3, Xiangfang Zeng4, Bin Liu3 |
1 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2 State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
3 Mengcheng National Geophysical Observatory, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
4 CAS Key Laboratory of Computational Geodynamics, University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The Yellowstone volcano is one of the largest active volcanoes in the world, and its potential hazards demand detailed seismological and geodetic studies. Previous studies with travel time tomography and receiver functions have revealed a low-velocity layer in the crust beneath the Yellowstone volcano, suggesting the presence of a magma chamber at depth. We use ambient seismic noise from regional seismic stations to retrieve short-period surface waves and then study the shallow shear velocity structure of the Yellowstone region by surface wave dispersion analysis. We first obtained a crustal model of the area outside of the Yellowstone volcano and then constructed an absolute shear wave velocity structure in combination with receiver function results for the crust beneath the Yellowstone volcano. The velocity model shows a low-velocity layer with shear velocity at around 1.3 km/s, suggesting that a large-scale magma chamber exists at shallow levels within the crust of the Yellowstone volcanic region.
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Received: 09 July 2013
Published: 30 October 2013
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| Fund:China Postdoctoral Science Foundation 2012M510043, 2013T60166, NSFC 41074032 and CAS KZCX2-EW-121 |
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Corresponding Authors:
Yan L
E-mail: sdni@whigg.ac.cn
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