Primeros resultados de recurrencia paleosísmica de la Zona de Falla de El Salvador

  1. Carolina Canora Catalán 1
  2. José Jesús Martínez Díaz 1
  3. Pilar Villamor Pérez 2
  4. Kelvin R. Berryman 2
  5. Ramón Capote del Villar 1
  6. José Antonio Álvarez Gómez 3
  7. C. Pullinger 4
  1. 1 Universidad Complutense de Madrid. Dpto Geodinámica
  2. 2 GNS Science, New Zealand
  3. 3 Instituto Geográfico Nacional
    info

    Instituto Geográfico Nacional

    Madrid, España

    ROR https://ror.org/03yycdv57

  4. 4 LaGeo. El Salvador
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Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2008

Issue Title: VII Congreso Geológico de España

Issue: 10

Pages: 999-1002

Type: Article

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Abstract

The El Salvador Fault Zone (ESFZ) is a 150 km long, E-W oriented, strike-slip fault and has recently been identified as the source of the destructive Mw 6.6 El Salvador earthquake of 2001. The fault zone comprises three major segments from Lake Ilopango to Golfo de Fonseca. Along this sector the fault displaces recent volcanic and alluvial deposits. According to previous seimotectonic studies, the reactivation of the occidental segment (Ilopango - San Vicente) produced the 2001 damaging seismic event. Holocene activity of this fault segment deforms fluvial terraces and produces morphological features related to strike-slip movement. In this work we present the results of the first paleoseismic analysis carried out on this fault. Trenching studies on the Ilopango-San Vicente segment shows that surface rupture events have occurred at least twice along the fault during the past 1.5 ka. The geometry of faulting exposed in the trench provides valuable insights into the kinematics of the fault, and provides a preliminary minimum net slip rate of 1.9 mm/yr.

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