Seismic Velocity Heterogeneity of the Hikurangi Subduction Margin, New Zealand: Elevated Pore Pressures in a Region With Repeating Slow Slip Events

Yarce, Jefferson; Sheehan, Anne; Roecker, Steven; Mochizuki, Kimihiro

doi:10.1029/2020jb021605

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Seismic Velocity Heterogeneity of the Hikurangi Subduction Margin, New Zealand: Elevated Pore Pressures in a Region With Repeating Slow Slip Events

2021
By Yarce, Jefferson ; Sheehan, Anne ; Roecker, Steven ; ...
Source: Journal of Geophysical Research: Solid Earth, 126(5)

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Journal Title:

Journal of Geophysical Research: Solid Earth
Personal Author:

Yarce, Jefferson ; Sheehan, Anne ; Roecker, Steven ; Mochizuki, Kimihiro

Yarce, Jefferson ; Sheehan, Anne ; Roecker, Steven ; Mochizuki, Kimihiro Less -
NOAA Program & Office:

CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:

We investigated the seismic velocity structure of the Hikurangi margin in New Zealand to uncover the physical features of the subduction zone and explore the relationships between microearthquake seismicity, seismic velocity structure, and slow slip events. Using local earthquake tomography with data collected from both temporary ocean bottom seismometers and on-land permanent seismic stations, we used the tomography code TomoFD to iteratively perform a damped least squared inversion of absolute P and S arrival times to obtain relocated hypocenters and generate 3D velocity models for Vp and Vp/Vs. The seismic tomography images show two high Vp/Vs anomalies, one offshore
Keywords:

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Earth And Planetary Sciences (miscellaneous) Geochemistry And Petrology Geophysics Space And Planetary Science
Source:

Journal of Geophysical Research: Solid Earth, 126(5)
DOI:

https://doi.org/10.1029/2020jb021605
ISSN:

2169-9313;2169-9356;
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PDF
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American Geophysical Union (AGU)
Document Type:

Journal Article
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urn:sha256:dfc8c7a0978fa68eb2d61ff8263641f7ad38f49ea77ea668e70ea0c9f687bcb2
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https://repository.library.noaa.gov/view/noaa/55135/noaa_55135_DS1.pdf
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[PDF-7.29 MB]

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