Observatorio de I+D+i UPM

Memorias de investigación
Ponencias en congresos:
Present day kinematics of El Salvador Fault Zone
Áreas de investigación
  • Geología,
  • Geofísica,
  • Ingenierías
The El Salvador Fault Zone (ESFZ) (Martínez-Díaz et al., 2004) is the main structure seismically active in El Salvador. This structure plays an important role in the tectonics of the Chortis block, since its motion is directly related to the drift of the Caribbean plate to the east and not with the partitioning of the deformation of the Cocos subduction. The geometry and the degree of activity of the ESFZ have been studied from geodetic (Staller et al., 2016), geological and paleoseismological studies (Canora et al., 2012; 2014b; Alonso-Henar et al., 2014). In this work we use horizontal GPS velocities (Staller et al., 2016), geological and seismological data to investigate the rate and nature of interseismic strain accumulation on major faults along the ESFZ. This allows us to estimate the distribution of interseismic coupling on the subduction zone interface beneath El Salvador and the kinematics of the tectonic block rotations. Our best model estimates a long-term movement of the Salvadoran forearc of 13.5 ± 1 mm/yr ~NO with respect to the Caribbean plate. The kinematics of the ESFZ confirms an increase in east to west velocity within the forearc block, which is coherent with the regional kinematics of the Chortis Block, as extension is greater in the western part of this block, which combined with the pinning of the forearc block in Guatemala (Álvarez-Gómez et al., 2008), favors east to west strike-slip movement in El Salvador. We find that the data are best fit with a model that includes two intermediate blocks between the main Caribbean and forearc blocks. Our results confirm that the degree of coupling at the interface of the subduction zone off the Salvadoran coastline is practically zero, however the faults of the Salvadoran volcanic arc are almost completely locked.
Nombre congreso
IASPEI Regional Assembly Latin - American and Caribbean Seismological Commision - LACSC.
Tipo de participación
Lugar del congreso
San José, Costa Rica
Fecha inicio congreso
Fecha fin congreso
Desde la página
Hasta la página
Título de las actas
IASPEI Regional Assembly Latin - American and Caribbean Seismological Commision - LACSC.
Esta actividad pertenece a memorias de investigación
  • Autor: Alejandra Staller Vazquez (UPM)
  • Autor: José Antonio Álvarez-Gómez (Universidad Complutense de Madrid)
  • Autor: José J. Martínez-Díaz (Universidad Complutense de Madrid)
  • Autor: Maria Belen Benito Oterino (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Ingeniería Sísmica: Dinámica de Suelos y Estructuras
  • Departamento: Ingeniería Topográfica y Cartografía
S2i 2021 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)