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The earthquake activity of Israel; revisiting 30 years of local and regional seismic records along the Dead Sea Transform

Nadav Wetzler and Ittai Kurzon
The earthquake activity of Israel; revisiting 30 years of local and regional seismic records along the Dead Sea Transform
Seismological Research Letters (February 2016) 87 (1): 47-58

Abstract

More than 15,000 seismic events were recorded by the Israel Seismic Network (ISN) during the past 30 years, at the vicinity of the Dead Sea fault (DSF) zone. During those years, locations were obtained using several velocity models, which resulted in inconsistent locations. In addition, we found that seismicity is biased to very shallow depth estimations that do not match other estimations of more localized studies in the region. This study is focused on improving the regional earthquake catalog using robust single-event location software (within the Antelope software), based on two seismic velocity models: (1) a local model (Gitterman et al., 2005) and (2) a global model (Kennett and Engdahl, 1991). The relocated events show more reasonable depth distributions, in accordance with the seismotectonic settings of the region, and the local velocity model shows smaller location errors than the global velocity model, suggesting better convergence of the location solutions. We also demonstrate and analyze the difference in the event-station distribution, showing location effects of a sparse network, in which the main effect is seen for the focal depths: events located out of the network coverage tend to obtain a focal depth shallower than events located within the network coverage. The depth cross section along the DSF zone, within the boundaries of this study, presents a good correlation with previous estimation of the boundaries of the seismogenic zone, obtained by heat-flow analysis. The relocated earthquake catalog is regarded as the new initial robust locations of the seismic bulletin of the ISN and considered as the basis for future studies and for more elaborated relocations; it is open to the public and can be downloaded from the Geological Survey of Israel website at https://www.gsi.gov.il (last accessed December 2015).


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 87
Serial Issue: 1
Title: The earthquake activity of Israel; revisiting 30 years of local and regional seismic records along the Dead Sea Transform
Affiliation: University of California Santa Cruz, Santa Cruz, CA, United States
Pages: 47-58
Published: 201602
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 88
Accession Number: 2016-025758
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. 1 table, geol. sketch maps
N31°04'60" - N31°45'00", E35°19'60" - E35°34'60"
N29°30'00" - N33°30'00", E34°19'60" - E35°30'00"
Secondary Affiliation: Geological Survey of Israel, ISR, Israel
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201613
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