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Ring-Shaped Seismicity Structures in South Kamchatka: Probable Preparation of a Great Earthquake.

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Title: Ring-Shaped Seismicity Structures in South Kamchatka: Probable Preparation of a Great Earthquake.
Authors: Kopnichev, Yu. F.1 (AUTHOR) yufk777@mail.ru, Sokolova, I. N.2 (AUTHOR) sokolovain@gsras.ru
Source: Izvestiya, Physics of the Solid Earth. Apr2025, Vol. 61 Issue 2, p207-212. 6p.
Subject Terms: *Earthquake aftershocks, *Earthquakes, *Subduction zones, *Earthquake hazard analysis, *Seismic wave studies, *Earthquake zones, *Paleoseismology
Geographic Terms: Kamchatka Peninsula (Russia)
Abstract: Abstract—Some characteristics of seismicity in South Kamchatka are discussed. Parameters of the aftershock cloud of the August 17, 2024 large earthquake (Mw = 7.0) are studied. It is shown that ring-shaped seismicity structures in South Kamchatka have been formed in three depth ranges: 0–33, 34–70, and 71–110 km. As in other subduction zones, the structures are characterized in terms of limiting magnitude values—threshold magnitudes Mt1, Mt2, and Mt3, respectively, and lengths of major axes L1, L2, and L3. The epicenters of the August 17, 2024 earthquake and its strongest aftershocks fall in a shallow ring-shaped structure (Mt1 = 5.3), which supports the hypothesis of a preparation of a great earthquake in the South Kamchatka region. In the previous works, the correlation dependences of parameters Mt1 and Mt2 on the magnitudes Mw of large earthquakes have been constructed for the western Pacific (in the range Mw = 7.0–9.0). Using these dependencies, we estimated the magnitude of the great possible event in this region at Mw = 8.6 ± 0.2. The factors responsible for the formation of ring-shaped seismicity structures at different depths in the subduction zones are discussed. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 186837148
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  Label: Title
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  Data: Ring-Shaped Seismicity Structures in South Kamchatka: Probable Preparation of a Great Earthquake.
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  Data: <searchLink fieldCode="AR" term="%22Kopnichev%2C+Yu%2E+F%2E%22">Kopnichev, Yu. F.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yufk777@mail.ru</i><br /><searchLink fieldCode="AR" term="%22Sokolova%2C+I%2E+N%2E%22">Sokolova, I. N.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> sokolovain@gsras.ru</i>
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  Data: <searchLink fieldCode="JN" term="%22Izvestiya%2C+Physics+of+the+Solid+Earth%22">Izvestiya, Physics of the Solid Earth</searchLink>. Apr2025, Vol. 61 Issue 2, p207-212. 6p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Earthquake+aftershocks%22">Earthquake aftershocks</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquakes%22">Earthquakes</searchLink><br />*<searchLink fieldCode="DE" term="%22Subduction+zones%22">Subduction zones</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquake+hazard+analysis%22">Earthquake hazard analysis</searchLink><br />*<searchLink fieldCode="DE" term="%22Seismic+wave+studies%22">Seismic wave studies</searchLink><br />*<searchLink fieldCode="DE" term="%22Earthquake+zones%22">Earthquake zones</searchLink><br />*<searchLink fieldCode="DE" term="%22Paleoseismology%22">Paleoseismology</searchLink>
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  Label: Geographic Terms
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  Data: <searchLink fieldCode="DE" term="%22Kamchatka+Peninsula+%28Russia%29%22">Kamchatka Peninsula (Russia)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract—Some characteristics of seismicity in South Kamchatka are discussed. Parameters of the aftershock cloud of the August 17, 2024 large earthquake (Mw = 7.0) are studied. It is shown that ring-shaped seismicity structures in South Kamchatka have been formed in three depth ranges: 0–33, 34–70, and 71–110 km. As in other subduction zones, the structures are characterized in terms of limiting magnitude values—threshold magnitudes Mt1, Mt2, and Mt3, respectively, and lengths of major axes L1, L2, and L3. The epicenters of the August 17, 2024 earthquake and its strongest aftershocks fall in a shallow ring-shaped structure (Mt1 = 5.3), which supports the hypothesis of a preparation of a great earthquake in the South Kamchatka region. In the previous works, the correlation dependences of parameters Mt1 and Mt2 on the magnitudes Mw of large earthquakes have been constructed for the western Pacific (in the range Mw = 7.0–9.0). Using these dependencies, we estimated the magnitude of the great possible event in this region at Mw = 8.6 ± 0.2. The factors responsible for the formation of ring-shaped seismicity structures at different depths in the subduction zones are discussed. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1134/S1069351325700193
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 6
        StartPage: 207
    Subjects:
      – SubjectFull: Earthquake aftershocks
        Type: general
      – SubjectFull: Earthquakes
        Type: general
      – SubjectFull: Subduction zones
        Type: general
      – SubjectFull: Earthquake hazard analysis
        Type: general
      – SubjectFull: Seismic wave studies
        Type: general
      – SubjectFull: Earthquake zones
        Type: general
      – SubjectFull: Paleoseismology
        Type: general
      – SubjectFull: Kamchatka Peninsula (Russia)
        Type: general
    Titles:
      – TitleFull: Ring-Shaped Seismicity Structures in South Kamchatka: Probable Preparation of a Great Earthquake.
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          Name:
            NameFull: Kopnichev, Yu. F.
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          Name:
            NameFull: Sokolova, I. N.
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            – D: 01
              M: 04
              Text: Apr2025
              Type: published
              Y: 2025
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              Value: 61
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              Value: 2
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            – TitleFull: Izvestiya, Physics of the Solid Earth
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