期刊
GEOPHYSICAL RESEARCH LETTERS
卷 48, 期 3, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL090947
关键词
Dead Sea; seismic intensity; seismites; seismogenic sedimentary processes; sof‐ sediment deformation; turbidites
资金
- University of Liege
- IPD-STEMA Program [R.DIVE.0899-J-F-G]
- Austrian Science Fund [FWF: M 2817]
- DESERVE Virtual Institute of the Helmholtz Association
- Israel Science Foundation [1093/10, 1645/19]
- ICDP
This study discusses a new method to determine the seismic origin of prehistoric turbidites by analyzing in situ deformations. It suggests that observing the underlying in situ deformations can validate the seismic origin of turbidites.
The seismic origin of turbidites is verified either by correlating such layers to historic earthquakes, or by demonstrating their synchronous deposition in widely spaced, isolated depocenters. A historic correlation could thus constrain the seismic intensity required for triggering turbidites. However, historic calibration is not applicable to prehistoric turbidites. In addition, the synchronous deposition of turbidites is difficult to test if only one deep core is drilled in a depocenter. Here, we propose a new approach that involves analyzing the underlying in situ deformations of prehistoric turbidites, as recorded in a 457 m-long core from the Dead Sea center, to establish their seismic origin. These in situ deformations have been verified as seismites and could thus authenticate the trigger for each overlying turbidite. Moreover, our high-resolution chemical and sedimentological data validate a previous hypothesis that soft-sediment deformation in the Dead Sea formed at the sediment-water interface.
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