GeoPhysical Research Letters
2018
The plate interface beneath the Mejillones Peninsula in Northern Chile is characterized by anomalous seismogenic behaviors, with seismic and aseismic slip, and low coupling values. We analyze this zone through the seismicity pattern and a 3D tomography model. We identify high Vp/Vs values within the oceanic crust and in the lower continental crust, that we interpret as hydrated zones rich in fluids. These zones are correlated with the Mejillones fracture zone and with highly permeable lithologies of the lower continental crust, which allow a greater accumulation of fluids at the plate interface beneath the Mejillones Peninsula. Additionally, these areas exhibit a high rate of seismicity and concentrated swarms and repeaters. We propose that the presence of fluids controls the anomalous seismogenic behavior along the plate interface beneath the Mejillones Peninsula.
F. Pasten-Araya 1,2; P. Salazar 1,2; S. Ruiz 3; E. Rivera 3; B. Potin 4; A. Maksymowicz 3; E. Torres 1,2; J. Villarroel 1,2; E. Cruz 1,2: J. Valenzuela 1,2; D. Jaldín 1; G. González 1,2; W. Bloch 5; P. Wigger 5; and S.A. Shapiro 5
1 Geology Department, Universidad Católica del Norte, Antofagasta, Chile
2 Natural Research Center for Integrated Natural Disasters Management (CIGIDEN)
3 Geophysics Department, Universidad de Chile, Santiago, Chile
4 Centro Sismológico Nacional, Universidad de Chile, Santiago, Chile
5 Freie Universität Berlin, Fachrichtung Geophysik, Berlin, Germany
Corresponding author: Francisco Pasten-Araya (Fpa007@ucn.cl)