Articles | Volume 6, issue 4
Research article
29 Oct 2015
Research article |  | 29 Oct 2015

Density structure and geometry of the Costa Rican subduction zone from 3-D gravity modeling and local earthquake data

O. H. Lücke and I. G. Arroyo

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Cited articles

Abratis, M. and Wörner, G.: Ridge collision, slab-window formation, and the flux of Pacific asthenosphere into the Caribbean realm, Geology, 29, 127–130,<0127:RCSWFA>2.0.CO;2, 2001.
Arroyo, I. G.: Sismicidad y Neotectónica en la región de influencia del Proyecto Boruca: hacia una mejor definición sismogénica del sureste de Costa Rica, Licenciate Thesis, University of Costa Rica, San José, Costa Rica, 162 pp., 2001.
Arroyo, I., Alvarado, G. E., and Flueh, E. R.: Local seismicity at the Cocos Ridge – Osa Peninsula subduction Zone, Costa Rica, AGU Fall Meeting, 8–12 December 2003, San Francisco, USA, S52F–0174, 2003.
Arroyo, I. G., Husen, S., Flueh, E. R., Gossler, J., Kissling, E., and Alvarado, G. E.: Threedimensional P wave velocity structure on the shallow part of the Central Costa Rican Pacific margin from local earthquake tomography using off- and onshore networks, Geophys. J. Int., 179, 827–849,, 2009.
Barckhausen, U., Ranero, C. R., von Huene, R., Cande, S. C., and Roeser, H. A.: Revised tectonic boundaries in the Cocos Plate off Costa Rica: implications for the segmentation of the convergent margin and for plate tectonic models, J. Geophys. Res., 106, 19207–19229, 2001.
Short summary
In this paper, the 3-D density structure of the Costa Rican subduction zone is modeled by means of interactive forward modeling of gravity data. The geometry of the subduction zone is constrained, among other geophysical data, by relocated earthquake hypocenters, taking into account intermediate depth seismicity which provides new information on the plate interface. In the preferred model, the presence of a continuous, steeply subducting slab is interpreted for SE Costa Rica.