High‐Resolution Receiver Function Imaging Across the Cascadia Subduction Zone Using a Dense Nodal Array

Ward, K. M.; Lin, F.; Schmandt, B.

doi:10.1029/2018GL079903

Title: High‐Resolution Receiver Function Imaging Across the Cascadia Subduction Zone Using a Dense Nodal Array

Journal Article · 20 November 2018 · Geophysical Research Letters

DOI: https://doi.org/10.1029/2018GL079903 · OSTI ID:2279776

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Department of Geology and Geological Engineering South Dakota School of Mines and Technology Rapid City SD USA, Department of Geology and Geophysics University of Utah Salt Lake City UT USA
Department of Geology and Geophysics University of Utah Salt Lake City UT USA
Department of Earth and Planetary Sciences University of New Mexico Albuquerque NM USA

Abstract In the summer of 2017, we deployed 174 nodal geophones in the Cascadia Subduction Zone forearc with the specific aim of conducting a high‐resolution receiver function study. The dense trench perpendicular line in central Oregon with 500‐m spacing recorded continuous data for approximately 40 days. Our plate tectonic‐scale imaging results show the same features as previous broadband seismic deployments including the top of the subducting Juan de Fuca Plate, the slab Moho, and the continental Moho. Although our deployment was limited to around 40 days, the dense station spacing allowed us to image the shallow Oregon forearc in remarkable detail. In our shallow results, we image a continuous positive arrival that we interpret as the top of the accreted Siletzia terrane. We suggest that hybrid nodal/broadband deployments could be used in conjunction with offshore seismic studies to image subduction zones in unprecedented detail.

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Sponsoring Organization:: USDOE

OSTI ID:: 2279776

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 22 Vol. 45; ISSN 0094-8276

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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