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    Active faults' geometry in the Gulf of Aqaba, southern Dead Sea fault, illuminated by multi beam bathymetric data

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    essoar.10504675.1.pdf
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    Type
    Preprint
    Authors
    Ribot, Matthieu cc
    Klinger, Yann
    Jonsson, Sigurjon cc
    Avsar, Ulas
    Pons-Branchu, Edwige
    Matrau, Rémi
    Mallon, Francis L
    KAUST Department
    Crustal Deformation and InSAR Group
    Earth Science and Engineering Program
    King Abdullah University of Science and Technology
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OSR-2016-CRG6-3027-01
    Date
    2020-11-07
    Permanent link to this record
    http://hdl.handle.net/10754/665920
    
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    Abstract
    Detailed knowledge of fault geometry is important for accurate seismic hazard assessments. The Gulf of Aqaba, which corresponds to the southern termination of the 1200-km-long Dead Sea fault system, remains one of the least known parts of this plate boundary fault, in large part due to its location offshore. Classically, the Gulf of Aqaba has been described as a succession of three pull-apart basins. Here, building on a new multibeam bathymetric survey of the Gulf of Aqaba, we provide details about the geometry of the faults at the bottom of the gulf that controls its morphology. In particular, we identify a 50 km-long fault section that shows evidence of recent activation. We associate this fault section (Aragonese fault) with the section that ruptured during the 1995 magnitude Mw7.3 Nuweiba earthquake. In the southern part of the gulf, bathymetry emphasizes the strike-slip nature of the Arnona fault, while dip-slip motion seems to be accommodated mostly by faults located along the eastern edge of the gulf. Considering the simple linear geometry of the Arnona fault and the absence of any large earthquake for several centuries, despite an average slip-rate of ~5 mm/yr, this fault should be considered as a significant candidate for an earthquake rupture of magnitude 7 or above in the near future.
    Citation
    Ribot, M., Klinger, Y., Jónsson, S., Avsar, U., Pons-Branchu, E., Matrau, R., & Mallon, F. L. (2020). Active faults’ geometry in the Gulf of Aqaba, southern Dead Sea fault, illuminated by multi beam bathymetric data. doi:10.1002/essoar.10504675.1
    Sponsors
    This study was funded by King Abdullah University of Science and Technology (KAUST), under award number OSR-2016-CRG6-3027-01. We thank Brian C. Hession (CMOR, KAUST) for the help with the multibeam data acquisition and initial processing, and the crew on R/V Thuwal for their work during the May-June 2018 research cruise.
    Publisher
    Wiley
    DOI
    10.1002/essoar.10504675.1
    Additional Links
    http://www.essoar.org/doi/10.1002/essoar.10504675.1
    ae974a485f413a2113503eed53cd6c53
    10.1002/essoar.10504675.1
    Scopus Count
    Collections
    Preprints; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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