Zhan, Zhongwen and Helmberger, Donald V. and Li, Dunzhu (2014) Imaging subducted slab structure beneath the Sea of Okhotsk with teleseismic waveforms. Physics of the Earth and Planetary Interiors, 232 . pp. 30-35. ISSN 0031-9201. doi:10.1016/j.pepi.2014.03.008. https://resolver.caltech.edu/CaltechAUTHORS:20140725-091021610
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Abstract
The structure of subducted slabs is not well imaged in most global tomographic models with anomalies typically less than 1%. Synthetic waveforms for such models are not noticeably different from their 1D reference models. In contrast, we find that observed teleseismic waveforms sampling slabs in the down-dip direction display multipathing features indicative of substantial structure. Such waveform complexity patterns appear distinctly different for various source locations with outer-rise events generally displaying relatively simple waveforms. Here, we model these waveform patterns for a portion of the Kuril subduction zone. The best fitting slab models have relatively fast cores (∼5%) with smooth edges compatible with thermal modeling in shape. Complete seismograms for these 2D models indicate that multibounce P and S waves are slab-sensitive and can be used in refining models.
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| Additional Information: | © 2014 Elsevier B.V. Received 8 November 2013; Received in revised form 17 March 2014; Accepted 17 March 2014; Available online 2 April 2014. We thank Brian Savage, Teh-Ru Alex Song, and an anonymous reviewer for helpful comments. We thank Hiroo Kanamori, Robert Clayton, Mark Simons, Daoyuan Sun, and Risheng Chu for helpful discussions. The Incorporated Research Institutions for Seismology (IRIS) provided the seismic data. This work is supported by the Tectonic Observatory at California Institute of Technology through GPS.TO2-4.2-Grant.Moore TO2. | |||||||||
| Group: | Caltech Tectonics Observatory, Seismological Laboratory | |||||||||
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| Subject Keywords: | Subduction zone; Teleseismic waveform; Slab structure; Finite difference | |||||||||
| DOI: | 10.1016/j.pepi.2014.03.008 | |||||||||
| Record Number: | CaltechAUTHORS:20140725-091021610 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140725-091021610 | |||||||||
| Official Citation: | Zhongwen Zhan, Donald V. Helmberger, Dunzhu Li, Imaging subducted slab structure beneath the Sea of Okhotsk with teleseismic waveforms, Physics of the Earth and Planetary Interiors, Volume 232, July 2014, Pages 30-35, ISSN 0031-9201, http://dx.doi.org/10.1016/j.pepi.2014.03.008. (http://www.sciencedirect.com/science/article/pii/S0031920114000971) | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 47492 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 25 Jul 2014 16:17 | |||||||||
| Last Modified: | 10 Nov 2021 17:40 |
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