Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Coseismic rupture and preliminary slip estimates for the Papatea Fault and its role in the 2016 M (sub w) 7.8 Kaikoura, New Zealand, earthquake

Robert M. Langridge, Julie Rowland, Pilar Villamor, Joshu J. Mountjoy, Dougal B. Townsend, Edwin Nissen, Christopher Madugo, William F. Ries, Caleb Gasston, Albane Canva, Alexandra E. Hatem and Ian Hamling
Coseismic rupture and preliminary slip estimates for the Papatea Fault and its role in the 2016 M (sub w) 7.8 Kaikoura, New Zealand, earthquake
Bulletin of the Seismological Society of America (June 2018) 108 (3B): 1596-1622

Abstract

Coseismic rupture of the 19-km-long north-striking and west-dipping sinistral reverse Papatea fault and nearby structures and uplift/translation of the Papatea block are two of the exceptional components of the 14 November 2016 M (sub w) 7.8 Kaikoura earthquake. The dual-stranded Papatea fault, comprising main (sinistral reverse) and western (dip-slip) strands, ruptured onshore and offshore from south of Waipapa Bay to George Stream in the north, bounding the eastern side of the Papatea block. Fault rupture mapping was aided by the acquisition of multibeam bathymetry, light detection and ranging (lidar) topography and other imagery, as well as differential lidar (D-lidar) from along the coast and Clarence River valley. On land, vertical throw and sinistral offset on the Papatea fault was assessed across an aperture of + or -100 m using uncorrected D-lidar and field data to develop preliminary slip distributions. The maximum up-to-the-west throw on the main strand is approximately 9.5+ or -0.5 m, and the mean throw across the Papatea fault is approximately 4.5+ or -0.3 m. The maximum sinistral offset, measured near the coast on the main strand, is approximately 6.1+ or -0.5 m. From these data, and considering fault dip, we calculate a maximum net slip of 11.5+ or -2 m and an average net slip of 6.4+ or -0.2 m for the Papatea fault surface rupture in 2016. Large sinistral reverse displacement on the Papatea fault is consistent with uplift and southward escape of the Papatea block as observed from Interferometric Synthetic Aperture Radar (InSAR) and optical image correlation datasets. The throw and net slip are exceedingly high for the length of the Papatea fault; such large movements likely only occur during multifault Kaikoura-type earthquakes that conceivably have recurrence times of > or =5000-12,000 yrs. The role of the Papatea fault in the Kaikoura earthquake has significant implications for characterizing complex fault sources in seismic hazard models.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 108
Serial Issue: 3B
Title: Coseismic rupture and preliminary slip estimates for the Papatea Fault and its role in the 2016 M (sub w) 7.8 Kaikoura, New Zealand, earthquake
Affiliation: GNS Science, Lower Hutt, New Zealand
Pages: 1596-1622
Published: 20180612
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 66
Accession Number: 2018-057701
Categories: Structural geologySeismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
S42°19'60" - S41°40'00", E173°00'00" - E175°00'00"
Secondary Affiliation: University of Auckland, NZL, New ZealandNational Institute of Water and Atmospheric Research, NZL, New ZealandUniversity of Victoria, CAN, CanadaPacific Gas and Electric Company, USA, United StatesUniversity of Southern California, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201831
Close Modal

or Create an Account

Close Modal
Close Modal