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Title: Adjoint tomography of ambient noise data and teleseismic P waves : methodology and applications to central California
Authors: Wang, Kai
Yang, Yingjie
Jiang, Chengxin
Wang, Yi
Tong, Ping
Liu, Tianshi
Liu, Qinya
Keywords: Science::Mathematics
Issue Date: 2021
Source: Wang, K., Yang, Y., Jiang, C., Wang, Y., Tong, P., Liu, T. & Liu, Q. (2021). Adjoint tomography of ambient noise data and teleseismic P waves : methodology and applications to central California. Journal of Geophysical Research: Solid Earth, 126(6), e2021JB021648-.
Journal: Journal of Geophysical Research: Solid Earth 
Abstract: Adjoint tomography has been recently applied to ambient seismic noise and teleseismic P waves separately to unveil fine-scale lithospheric structures beyond the resolving ability of traditional ray-based traveltime tomography. In this study, we propose an inversion scheme that alternates between frequency-dependent traveltime inversions of ambient noise surface waves and waveform inversions of teleseismic P waves to take advantage of their complementary sensitivities to the Earth's structure. We apply our method to ambient noise empirical Green's functions from 60 virtual sources, direct P and scattered waves from 11 teleseismic events recorded by a dense linear array (∼7 km station spacing) and other regional stations (∼40 km average station spacing) in central California. To evaluate the performance of the method, we compare tomographic results from ambient noise adjoint tomography, full-waveform inversion of teleseismic P waves, and the alternating inversion of the two data sets. Both applications to practical field data sets and synthetic checkerboard tests demonstrate the advantage of the alternating inversion over individual inversions as it combines the complementary sensitivities of the two independent data sets toward a more unified model. The three dimensional model from our alternating inversion not only shows major features of velocity anomalies and discontinuities in agreement with previous studies, but also reveals small-scale heterogeneities which provide new constraints on the geometry of the Isabella Anomaly and mantle dynamic processes in central California. The proposed alternating inversion scheme can be applied to other regions with similar array deployments for high-resolution lithospheric imaging.
ISSN: 2169-9313
DOI: 10.1029/2021JB021648
Schools: School of Physical and Mathematical Sciences 
Asian School of the Environment 
Rights: © 2021 American Geophysical Union. All rights reserved. This paper was published in Journal of Geophysical Research: Solid Earth and is made available with permission of American Geophysical Union.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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