SciELO - Scientific Electronic Library Online

vol.46 número2Submarine topography and faulting in Bahía de Banderas, MexicoGravity anomalies, sub-surface structure and oil and gas migration in the Mamfe, Cameroon-Nigeria, sedimentary basin índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados




Links relacionados

  • No hay artículos similaresSimilares en SciELO


Geofísica internacional

versión impresa ISSN 0016-7169


VARGAS, Carlos A.; PUJADES, Luís G.  y  MONTES, Luis. Seismic structure of South-Central Andes of Colombia by tomographic inversion. Geofís. Intl [online]. 2007, vol.46, n.2, pp.117-127. ISSN 0016-7169.

We have estimated the P-wave velocity structure under the Northwestern South America Andean region (NWSAA) by applying a tomographic method to 5671 P-wave arrival times from 499 local events recorded by sixteen permanent seismic stations of the Seismological Network of Colombia (SNC) from December 1992 to June 1999. Seven layers at depths of 5.0 km, 15.0 km, 25.0 km, 40.0 km, 60.0 km, 80.0 km and 100.0 km were postulated to obtain the Vp structure along the plate boundary between the Nazca, South America and Caribbean plates. The Vp structure suggests the existence of low velocity zones beneath volcanic regions. A high velocity area at 77° W - 4°N interrupting the low velocity zones (partially melted rocks) seems to arrive from a shallow anticline related to the upper mantle. This area of velocity contrasts marks the boundary between the more steeply dipping subduction to the north and shallower dipping subduction to the south. The Caribbean plate and the Chocó block join in the north and overlap the Nazca plate.

Palabras llave : Local earthquake tomography; subduction; Colombia.

        · resumen en Español     · texto en Inglés     · Inglés ( pdf )


Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons