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Moderate earthquakes striking Tehran metropolitan area: a case study of 2017 Malard and 2020 Damavand seismic sequences.

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Title: Moderate earthquakes striking Tehran metropolitan area: a case study of 2017 Malard and 2020 Damavand seismic sequences.
Authors: Niazpour, Bita1 (AUTHOR) bita.niazpour94@ut.ac.ir, Shomali, Zaher Hossein1 (AUTHOR)
Source: Journal of Seismology. Feb2024, Vol. 28 Issue 1, p103-117. 15p.
Subject Terms: *Metropolitan areas, *Earthquake hazard analysis, *Earthquake magnitude, *Earthquake aftershocks, *Green's functions, *Earthquakes, *Hazard mitigation, *Tsunami warning systems
Geographic Terms: Tehran (Iran), Iran
Abstract: The 2017 Malard and 2020 Damavand moderate crustal earthquakes (Mw 4.8) occurred about 40 km west and about 55 km northeast of Tehran, the capital and economic heart of Iran, with a metropolitan population of over 15 million. Seismic hazard assessment in the region has been affected by few historically documented destructive earthquakes with magnitudes around 7.0 (e.g., 312–280 B.C, 958, 1177, and 1830 A.D.); however, in the absence of large contemporary earthquakes, a detailed analysis of moderate earthquakes is essential. In this study, seismic sources of the two earthquakes are characterized in terms of focal mechanism, fault geometry, and rupture directivity through waveform inversion, hypocenter relocation, and empirical Green's function methods. The eastern segment of the well-known Mosha fault is responsible for the 2020 Damavand earthquake, with a left-lateral strike-slip mechanism ruptured unilaterally westward where Tehran is situated. The 2017 Malard earthquake is a peculiar case in a poorly studied region. For this event, we propose a left-lateral strike-slip mechanism corresponding to E-W trending Mahdasht fault. This event was preceded by a swarm of events, 12 km northward, that started a few months earlier and terminated right before the mainshock. The energy released due to this precursory activity was higher than the Malard mainshock and its aftershocks. The events seem to align along an N-S transverse basement fault that, further southward, may intersect with the Mahdasht fault system. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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  Label: Title
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  Data: Moderate earthquakes striking Tehran metropolitan area: a case study of 2017 Malard and 2020 Damavand seismic sequences.
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  Data: <searchLink fieldCode="AR" term="%22Niazpour%2C+Bita%22">Niazpour, Bita</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> bita.niazpour94@ut.ac.ir</i><br /><searchLink fieldCode="AR" term="%22Shomali%2C+Zaher+Hossein%22">Shomali, Zaher Hossein</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Seismology%22">Journal of Seismology</searchLink>. Feb2024, Vol. 28 Issue 1, p103-117. 15p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Metropolitan+areas%22">Metropolitan areas</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquake+hazard+analysis%22">Earthquake hazard analysis</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquake+magnitude%22">Earthquake magnitude</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquake+aftershocks%22">Earthquake aftershocks</searchLink><br />*<searchLink fieldCode="DE" term="%22Green's+functions%22">Green's functions</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquakes%22">Earthquakes</searchLink><br />*<searchLink fieldCode="DE" term="%22Hazard+mitigation%22">Hazard mitigation</searchLink><br />*<searchLink fieldCode="DE" term="%22Tsunami+warning+systems%22">Tsunami warning systems</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Tehran+%28Iran%29%22">Tehran (Iran)</searchLink><br /><searchLink fieldCode="DE" term="%22Iran%22">Iran</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The 2017 Malard and 2020 Damavand moderate crustal earthquakes (Mw 4.8) occurred about 40 km west and about 55 km northeast of Tehran, the capital and economic heart of Iran, with a metropolitan population of over 15 million. Seismic hazard assessment in the region has been affected by few historically documented destructive earthquakes with magnitudes around 7.0 (e.g., 312–280 B.C, 958, 1177, and 1830 A.D.); however, in the absence of large contemporary earthquakes, a detailed analysis of moderate earthquakes is essential. In this study, seismic sources of the two earthquakes are characterized in terms of focal mechanism, fault geometry, and rupture directivity through waveform inversion, hypocenter relocation, and empirical Green's function methods. The eastern segment of the well-known Mosha fault is responsible for the 2020 Damavand earthquake, with a left-lateral strike-slip mechanism ruptured unilaterally westward where Tehran is situated. The 2017 Malard earthquake is a peculiar case in a poorly studied region. For this event, we propose a left-lateral strike-slip mechanism corresponding to E-W trending Mahdasht fault. This event was preceded by a swarm of events, 12 km northward, that started a few months earlier and terminated right before the mainshock. The energy released due to this precursory activity was higher than the Malard mainshock and its aftershocks. The events seem to align along an N-S transverse basement fault that, further southward, may intersect with the Mahdasht fault system. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1007/s10950-023-10187-z
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 15
        StartPage: 103
    Subjects:
      – SubjectFull: Metropolitan areas
        Type: general
      – SubjectFull: Earthquake hazard analysis
        Type: general
      – SubjectFull: Earthquake magnitude
        Type: general
      – SubjectFull: Earthquake aftershocks
        Type: general
      – SubjectFull: Green's functions
        Type: general
      – SubjectFull: Earthquakes
        Type: general
      – SubjectFull: Hazard mitigation
        Type: general
      – SubjectFull: Tsunami warning systems
        Type: general
      – SubjectFull: Tehran (Iran)
        Type: general
      – SubjectFull: Iran
        Type: general
    Titles:
      – TitleFull: Moderate earthquakes striking Tehran metropolitan area: a case study of 2017 Malard and 2020 Damavand seismic sequences.
        Type: main
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            NameFull: Niazpour, Bita
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            NameFull: Shomali, Zaher Hossein
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            – D: 01
              M: 02
              Text: Feb2024
              Type: published
              Y: 2024
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              Value: 28
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