RT Journal Article
T1 Active Triclinic Transtension in a Volcanic Arc: A Case of the El Salvador Fault Zone in Central America
A1 Alonso Henar, Jorge
A1 Fernández Rodríguez, Carlos
A1 Álvarez Gómez, José Antonio
A1 Canora Catalán, Carolina
A1 Staller Vázquez, Alejandra
A1 Díaz, Manuel
A1 Hernández, Walter
A1 García, Ángela Valeria
A1 Martínez Díaz, José Jesús
AB The El Salvador Fault Zone (ESFZ) is part of the Central American Volcanic Arc and accommodates the oblique separation movement between the forearc sliver and the Chortis block (Caribbean Plate). In this work, a triclinic transtension model was applied to geological (fault-slip inversion, shape of volcanic calderas), seismic (focal mechanisms) and geodetic (GPS displacements) data to evaluate the characteristics of the last stages of the kinematic evolution of the arc. The El Salvador Fault Zone constitutes a large band of transtensional deformation whose direction varies between N90° E and N110° E. Its dip is about 70° S because it comes from the reactivation of a previous extensional stage. A protocol consisting of three successive steps was followed to compare the predictions of the model with the natural data. The results show a simple shear direction plunging between 20° and 50° W (triclinic flow) and a kinematic vorticity number that is mostly higher than 0.81 (simple-shearing-dominated flow). The direction of shortening of the coaxial component would be located according to the dip of the deformation band. It was concluded that this type of analytical model could be very useful in the kinematic study of active volcanic arcs, even though only information on small deformation increments is available.
PB MDPI
SN 2076-3263
YR 2022
FD 2022-06-30
LK https://hdl.handle.net/20.500.14352/71801
UL https://hdl.handle.net/20.500.14352/71801
LA eng
NO Ministerio de Ciencia e Innovación (MICINN)
DS Docta Complutense
RD 14 abr 2025