Details:

Journal Title:
Journal Of Geophysical Research: Solid Earth
Personal Author:
Yarce, J. ; Sheehan, A. F. ; Nakai, J. S. ; Schwartz, S. Y. ; Mochizuki, K. ; ... More +
Yarce, J. ; Sheehan, A. F. ; Nakai, J. S. ; Schwartz, S. Y. ; Mochizuki, K. ; Savage, M. K. ; Wallace, L. M. ; Henrys, S. A. ; Webb, S. C. ; Ito, Y. ; Abercrombie, R. E. ; Fry, B. ; Shaddox, H. ; Todd, E. K. Less -
NOAA Program & Office:
CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:
In 2014–2015, the Hikurangi Ocean Bottom Investigation of Tremor and Slow Slip experiment deployed seafloor absolute pressure gauges and ocean bottom seismometers directly above a large slow slip event, allowing examination of the relationship between slow slip and earthquakes in detail. Hikurangi Ocean Bottom Investigation of Tremor and Slow Slip data were combined with nearby existing land stations to create a catalog of microseismicity consisting of 2,300 earthquakes ranging in magnitude between 0.5 and 4.7 that is complete to magnitude 1.5, yielding almost twice as many events as detected by the onshore networks alone. This greatly improves the seismicity catalog for this active subduction zone margin, especially in the offshore portion that was difficult to study using only the inland permanent seismic network. The new locations for the events within the footprint of the offshore network show that earthquakes near the trench are systematically shallower than and NW (landward) of their locations using only land‐based stations. Our results indicate that Hikurangi seismicity is concentrated in two NE‐SW bands, one offshore beneath the outer forearc wedge, one onshore beneath the eastern Raukumara Peninsula, and the majority of earthquakes are within the subducting Pacific plate with a smaller percent at the plate interface. We find a 20‐km wide northeast trending gap in microseismicity between the two bands and beneath the inner forearc wedge and this gap in seismicity borders the downdip edge of a slow slip patch.
Keywords:
[+]
Ocean Bottom Seismology
Source:
JGR Solid Earth (2019). 124(5): 4751-5766
DOI:
https://doi.org/10.1029/2018JB017211
Document Type:
Journal Article
Rights Information:
Other
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:34424258de8e74956da4ea9deac4484c1c42f1556701ca1a62a6695af9d7c9d9
Download URL:
https://repository.library.noaa.gov/view/noaa/25146/noaa_25146_DS1.pdf
File Type:

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