Mixed deformation styles observed on a shallow subduction thrust, Hikurangi margin, New Zealand
| Autor: | Fagereng, A, Savage, HM, Morgan, JK, Wang, M, Meneghini, F, Barnes, PM, Bell, R, Kitajima, H, McNamara, DD, Saffer, DM, Wallace, LM, Petronotis, K, LeVay, L, Scientists, IODP Expedition |
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| Rok vydání: | 2019 |
| Předmět: |
Geochemistry & Geophysics
010504 meteorology & atmospheric sciences 04 Earth Sciences ZONE Slip (materials science) Fault (geology) 010502 geochemistry & geophysics 01 natural sciences Breccia Thrust fault 14. Life underwater FAULTS 0105 earth and related environmental sciences geography geography.geographical_feature_category Science & Technology Subduction Hikurangi Margin Geology EARTHQUAKES International Ocean Discovery Program Seafloor spreading SLIP SLOW Physical Sciences MECHANICS Seismology |
| Zdroj: | GEOLOGY Geology |
| ISSN: | 0091-7613 |
| Popis: | Geophysical observations show spatial and temporal variations in fault slip style on shallow subduction thrust faults, but geological signatures and underlying deformation processes remain poorly understood. International Ocean Discovery Program (IODP) Expeditions 372 and 375 investigated New Zealand’s Hikurangi margin in a region that has experienced both tsunami earthquakes and repeated slow-slip events. We report direct observations from cores that sampled the active Pāpaku splay fault at 304 m below the seafloor. This fault roots into the plate interface and comprises an 18-m-thick main fault underlain by ∼30 m of less intensely deformed footwall and an ∼10-m-thick subsidiary fault above undeformed footwall. Fault zone structures include breccias, folds, and asymmetric clasts within transposed and/or dismembered, relatively homogeneous, silty hemipelagic sediments. The data demonstrate that the fault has experienced both ductile and brittle deformation. This structural variation indicates that a range of local slip speeds can occur along shallow faults, and they are controlled by temporal, potentially far-field, changes in strain rate or effective stress. |
| Databáze: | OpenAIRE |
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