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Crustal S-wave velocity structure of the Yellowstone region using a seismic ambient noise method |
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| Authors: | Yan Lü Sidao Ni Jun Xie Yingjie Xia Xiangfang Zeng Bin Liu |
| Institution: | 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 |
| 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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