کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4719666 | 1639206 | 2006 | 23 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The offshore morpho-structure and tsunami sources of the Viti Levu Seismic Zone, southeast Viti Levu, Fiji
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The offshore morpho-structure and tsunami sources of the Viti Levu Seismic Zone, southeast Viti Levu, Fiji The offshore morpho-structure and tsunami sources of the Viti Levu Seismic Zone, southeast Viti Levu, Fiji](/preview/png/4719666.png)
چکیده انگلیسی
New high-resolution SeaBAT 8160 multibeam bathymetry data reveal in detail the complex offshore morphology over part of the Viti Levu Seismic Zone (VLSZ) in southeast Viti Levu. The mapped seafloor is scarred by a complex network of linear submarine canyons and numerous submarine slides. The submarine canyons are morphologic expressions of graben structures in the underlying basement rock. Submarine canyon faults are continuous with nearshore (shelf) faults and onshore fault-controlled valleys and structural lineaments. Together, these define continuous onshore-offshore fault zones, which combined form a structurally complex fault mesh of composite origin. We attribute the development of the principal fault sets in the fault mesh to progressive distributed faulting in response to anticlockwise tectonic block rotations within the Fiji Platform during the Neogene. Low occurrence of large earthquakes, and a diffused pattern of seismicity currently observed in the VLSZ, may reflect complex coseismic faulting through the fault mesh. The abundance of submarine slides over the VLSZ, which typically occur on the outer barrier reef edge, as well as the submarine canyon heads and walls, and mid-slope, imply that seismic shaking may be an important factor for triggering slope failure. Morphometric analysis and empirical modelling of the slides show that slides triggered in shallow water depths, within 5Â km of the coastline, at the outer barrier reef edge, and submarine canyon heads, produce the largest near-field tsunami amplitudes. We interpret that such slides represent a significant local tsunami hazard.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Geology - Volume 232, Issues 3â4, 7 November 2006, Pages 203-225
Journal: Marine Geology - Volume 232, Issues 3â4, 7 November 2006, Pages 203-225
نویسندگان
Tariq I.H. Rahiman, Jarg R. Pettinga,