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Illuminating the Pre-, Co-, and Post-Seismic Phases of the 2016 M7.8 Kaikōura Earthquake With 10 Years of Seismicity

journal contribution
posted on 07.10.2021, 21:31 by Calum ChamberlainCalum Chamberlain, WB Frank, F Lanza, John TownendJohn Townend, E Warren-Smith
The 2016 M7.8 Kaikōura earthquake is one of the most complex earthquakes in recorded history, with significant rupture of at least 21 crustal faults. Using a matched-filter detection routine, precise cross-correlation pick corrections, and accurate location and relocation techniques, we construct a catalog of 33,328 earthquakes between 2009 and 2020 on and adjacent to the faults that ruptured in the Kaikōura earthquake. We also compute focal mechanisms for 1,755 of the earthquakes used as templates. Using this catalog we reassess the rupture pathway of the Kaikōura earthquake. In particular we show that: (a) the earthquake nucleated on the Humps Fault; (b) there is a likely linking offshore reverse fault between the southern fault system and the Papatea Fault, which could explain the anomalously high slip on the Papatea Fault; (c) the faults that ruptured in the 2013 Cook Strait sequence were reactivated by the Kaikōura earthquake and may have played a role in the termination of the earthquake; and (d) no seismicity on an underlying subduction interface is observed beneath almost all of the ruptured region suggesting that if deformation did occur on the plate interface then it occurred aseismically and did not play a significant role in generating co-seismic ground motion.

Funding

The Straw that didnt Break the Camels Back: What Variations in Stressing-rate can Faults Withstand? | Funder: ROYAL SOCIETY OF NEW ZEALAND | Grant ID: 17-VUW-121

History

Preferred citation

Chamberlain, C. J., Frank, W. B., Lanza, F., Townend, J. & Warren-Smith, E. (2021). Illuminating the Pre-, Co-, and Post-Seismic Phases of the 2016 M7.8 Kaikōura Earthquake With 10 Years of Seismicity. Journal of Geophysical Research: Solid Earth, 126(8). https://doi.org/10.1029/2021JB022304

Journal title

Journal of Geophysical Research: Solid Earth

Volume

126

Issue

8

Publication date

01/08/2021

Publisher

American Geophysical Union (AGU)

Publication status

Published

Online publication date

03/08/2021

ISSN

2169-9313

eISSN

2169-9356

Language

en