DOI: 10.1016/j.epsl.2018.09.002
Scopus记录号: 2-s2.0-85053759120
论文题名: Free gas distribution and basal shear zone development in a subaqueous landslide – Insight from 3D seismic imaging of the Tuaheni Landslide Complex, New Zealand
作者: Gross F. ; Mountjoy J.J. ; Crutchley G.J. ; Böttner C. ; Koch S. ; Bialas J. ; Pecher I. ; Woelz S. ; Dannowski A. ; Micallef A. ; Huhn K. ; Krastel S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 502 起始页码: 231
结束页码: 243
语种: 英语
英文关键词: 3D seismic
; basal shear zone
; P-Cable
; shallow free gas
; subaqueous landslide
; Tuaheni Landslide Complex
Scopus关键词: Debris
; Deformation
; Flow of fluids
; Gas hydrates
; Gases
; Hydration
; Reflection
; Seismology
; Shear flow
; 3D seismic
; Free gas
; Gas hydrate stabilities
; Internal deformation
; Seismically active zones
; Shear zone
; Shear zone development
; Tuaheni Landslide Complex
; Landslides
; debris flow
; deformation
; fluid flow
; gas hydrate
; landslide
; sediment transport
; seismic data
; seismic zone
; shear zone
; three-dimensional modeling
; New Zealand
英文摘要: The Hikurangi margin is an active continental margin east of New Zealand's North Island. It is well recognized as a seismically active zone and is known for the occurrence of free gas and gas hydrates within the shallow sediments. A variety of subaqueous landslides can be observed at the margin, including the Tuaheni Landslide Complex off Poverty Bay. This slide complex has been interpreted previously as a slowly creeping landform, as its morphology and internal deformation is comparable to terrestrial earthflows and rock glaciers. In 2014, we acquired a high-resolution 3D seismic volume covering major parts of the Tuaheni South landslide. The 3D data show a variety of fluid migration indicators, free gas accumulations and manifestations of the base of gas hydrate stability in the pre-slide sedimentary units and the lower unit of the landslide system. The data also show that the landslide system is composed of an upper and lower unit that are separated by an intra-debris negative-polarity reflection. Free gas accumulations directly beneath the landslide units suggest that the debris acts as a boundary for rising fluids and only few migration pathways to the intra-debris reflector are observed in the distal parts of the landslide. Deformation within the landslide's debris is focused in the upper landslide unit, and we interpret the intra-debris reflector as a basal shear zone or ‘glide plane’ upon which the debris has been remobilized. The origin of the intra-debris reflector is unclear, but we suggest it could be a relatively coarse-grained horizon that would be prone to fluid flow focusing and the development of excess fluid pressure. Our seismic study provides one of the most detailed examples of a subaqueous landslide system and reveals insights into the fluid flow system and potential basal shear zone development of the Tuaheni Landslide Complex. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109658
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Christian-Albrechts-Universität zu Kiel, Institute of Geosciences, Kiel, Germany; NIWA, Wellington, New Zealand; GNS Science, Lower Hutt, New Zealand; GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany; University of Auckland, Faculty of Science, Auckland, New Zealand; Marine Geology & Seafloor Surveying, University of Malta, Msida, Malta; Marum, Bremen, Germany
Recommended Citation:
Gross F.,Mountjoy J.J.,Crutchley G.J.,et al. Free gas distribution and basal shear zone development in a subaqueous landslide – Insight from 3D seismic imaging of the Tuaheni Landslide Complex, New Zealand[J]. Earth and Planetary Science Letters,2018-01-01,502