Brittle-ductile deformation and fault slip behavior of a shallow subduction thrust, Hikurangi Margin, New Zealand

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Author(s): Fagereng, Ake; Savage, Heather M.; Morgan, Julia; Wang Maomao; Meneghini, Francesca; Barnes, Philip; Bell, Rebecca E.; Kitajima, Hiroko; McNamara, David D.; Saffer, Demian M.; Wallace, Laura M.; Pecher, Ingo Andreas; Petronotis, Katerina E.; LeVay, Leah J.
International Ocean Discovery Program (IODP), Expedition 372 Scientists
Author Affiliation(s): Primary:
Cardiff University, School of Earth and Ocean Sciences, Cardiff, United Kingdom
Lamont-Doherty Earth Observatory, United States
Rice University, United States
Hohai University, China
University of Pisa, Italy
National Institute of Water & Atmospheric Research, New Zealand
Imperial College London, United Kingdom
Texas A & M University, United States
GNS Science, New Zealand
Pennsylvania State University, United States
University of Texas at Austin, United States
University of Auckland, New Zealand
International Ocean Discovery Program, United States
Volume Title: AGU 2018 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2018; American Geophysical Union 2018 fall meeting, Washington, DC, Dec. 10-14, 2018. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Shallow subduction thrust faults may accommodate displacement by a mixture of steady aseismic creep, transient slow slip events, post-seismic afterslip, and propagation of co-seismic slip. Spatial and temporal transitions between varied fault slip styles are reported from geophysical observations, but the geological signatures are unknown and underlying controls are not well understood. Here, we report on direct observations from an active thrust fault in the frontal wedge of the northern Hikurangi Margin, New Zealand, based on core samples recovered on International Ocean Discovery Program Expedition 375. This thrust is a splay fault that appears to have accommodated at least several kilometers of displacement, and is located in a region of the margin that has experienced both shallow historical tsunami earthquakes and repeated large slow slip events.
Year of Publication: 2018
Research Program: IODP2 International Ocean Discovery Program
Key Words: 18 Geophysics, Solid-Earth; Australasia; Brittleness; Crust; Deformation; Ductility; Expedition 375; Fault zones; Faults; Hikurangi Margin; International Ocean Discovery Program; Lithosphere; New Zealand; Oceanic crust; Oceanic lithosphere; Pacific Ocean; Plate tectonics; Slip rates; South Pacific; Southwest Pacific; Subduction; Subduction zones; Thrust faults; West Pacific
Coordinates: S390300 S384100 E1791600 E1783500
Record ID: 2019050449
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States