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Crustal Fault Connectivity of the Mw 7.8 2016 Kaikōura Earthquake Constrained by Aftershock Relocations

journal contribution
posted on 09.02.2021, 07:15 by F Lanza, Calum Chamberlain, K Jacobs, E Warren-Smith, HJ Godfrey, M Kortink, CH Thurber, Martha Savage, John Townend, S Roecker, D Eberhart-Phillips
©2019. American Geophysical Union. All Rights Reserved. The 14 November 2016 Mw7.8 Kaikōura earthquake in the northern South Island, New Zealand, involved highly complex, multifault rupture. We combine data from a temporary network and the permanent national seismograph network to repick and relocate ~2,700 aftershocks of M≥3 that occurred between 14 November 2016 and 13 May 2017. Automatic phase-picking is carried out using REST, a newly developed hybrid method whose pick quality is assessed by comparing automatic picks for a subset of 138 events with analysts' picks. Aftershock hypocenters computed from high-quality REST picks and a 3-D velocity model cluster almost exclusively in the shallow crust of the upper plate and reveal linkages at depth between surface-rupturing fault segments. Only eight aftershocks are relocated on a deeper structure positioned between patches of geodetically detected afterslip. This indicates that afterslip has not triggered significant earthquake activity on the subduction interface during the period of aftershock activity analyzed.

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

Lanza, F., Chamberlain, C. J., Jacobs, K., Warren-Smith, E., Godfrey, H. J., Kortink, M., Thurber, C. H., Savage, M. K., Townend, J., Roecker, S. & Eberhart-Phillips, D. (2019). Crustal Fault Connectivity of the Mw 7.8 2016 Kaikōura Earthquake Constrained by Aftershock Relocations. Geophysical Research Letters, 46(12), 6487-6496. https://doi.org/10.1029/2019GL082780

Journal title

Geophysical Research Letters

Volume

46

Issue

12

Publication date

28/06/2019

Pagination

6487-6496

Publisher

American Geophysical Union (AGU)

Publication status

Published

Contribution type

Article

Online publication date

26/06/2019

ISSN

0094-8276

eISSN

1944-8007

Language

en

Exports