Tectonics of the Dead Sea Fault Driving the July 2018 Seismic Swarm in the Sea of Galilee (Lake Kinneret), Israel

Antoine Haddad, Marion Alcanie, Jiří Zahradník, Michael Lazar, Verónica Antunes, Luca Gasperini, Alina Polonia, Adriano Mazzini, Matteo Lupi

Research output: Contribution to journalArticlepeer-review

Abstract

Northern Israel was struck during July 2018 by a ML4.4 earthquake followed by a seismic sequence that lasted about 30 days. This seismic sequence occurred in the center of a temporary seismic network deployed around the Sea of Galilee (Lake Kinneret). The network was installed to investigate the regional kinematics of the Dead Sea Fault, which is a major transform fault running N-S for more than 1,000 km. The data allowed us to develop a local velocity model for the Sea of Galilee. We relocated more than 600 earthquakes and calculated 27 focal mechanisms pointing out a complex kinematic setting, possibly controlled by fluids at depth. The seismic sequence developed along a NNW-striking direction and it is bounded to the east by the N-striking Dead Sea fault. Hypocenter depths range between 6 and 13 km. Directions of the principal stress tensors suggest a transtentional deformation, in agreement with the overall kinematics of the region. We analyze and discuss our data set to investigate mechanisms that potentially triggered the observed seismic swarm, including exacerbated ground water pumping proposed by previous authors. We suggest that the seismic sequence is driven by the dissipation of the elastic load that accumulated in this region.

Original languageEnglish
Article numbere2019JB018963
JournalJournal of Geophysical Research: Solid Earth
Volume125
Issue number10
DOIs
StatePublished - 1 Oct 2020

Bibliographical note

Funding Information:
We thank Efthimios Sokos, Vladimir Plicka, Naama Sarid, Guy Lang, Victor Haddad, Christian Baillard, and all the colleagues involved in the fieldwork of this study. Permanent data of the INSN network belong to the Geological Survey of Israel. Figures?2,4,5, and 7 were created using the Generic Mapping Tool software (Wessel & Smith,?1991). Code for the ternary diagram written by M. Hall? was used (https://geo.mff.cuni.cz/hallo/). J. Zahradnik was supported from the Czech Science Foundation Grant GACR-18-06716J. A. Mazzini acknowledges the support from the Research Council of Norway through its Centres of Excellence funding scheme, (project 223272-CEED) and the HOTMUD (project-288299). M. Lupi is a SCCER-SoE professor supported by KTI funding.

Funding Information:
We thank Efthimios Sokos, Vladimir Plicka, Naama Sarid, Guy Lang, Victor Haddad, Christian Baillard, and all the colleagues involved in the fieldwork of this study. Permanent data of the INSN network belong to the Geological Survey of Israel. Figures 2,4,5 , and 7 were created using the Generic Mapping Tool software (Wessel & Smith, 1991 ). Code for the ternary diagram written by M. Halló was used ( https://geo.mff.cuni.cz/hallo/ ). J. Zahradnik was supported from the Czech Science Foundation Grant GACR‐18‐06716J. A. Mazzini acknowledges the support from the Research Council of Norway through its Centres of Excellence funding scheme, (project 223272‐CEED) and the HOTMUD (project‐288299). M. Lupi is a SCCER‐SoE professor supported by KTI funding.

Publisher Copyright:
©2020. American Geophysical Union. All Rights Reserved.

Keywords

  • Sea of Galilee
  • seismotectonics

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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