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Seismotectonics and lithospheric structure of Costa Rica
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Geophysics.
1999 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The interaction of different tectonic features on a short-distance scale of 100's of km produces the complexity of the Costa Rica region. The intraplate Caribbean earthquake activity of shallow-depth nature is mainly concentrated along an E-W axis in the central part of the country. All types of faults are presented in this region, although a strike-slip fault system, with NB-SW direction is proposed. Intraplate Caribbean esrthquakes in northwestem Panama are shallow and dominated by thrust fault motion. The seismicity along the Pacific coast is mainly associated with the subduction of the Cocos under theCaribbean plate, with predominant thrust fault mechanisms. The interaction of the Cocos and Nazca plates in southeastem Costa Rica, along the Panama fracture fault system produces events with strike-slip mechanism.

A proposed 1D P-velocity model for the region is presented. Relocation of earthquakes of this area made through this ID-velocity model provides a reliable geometry of the Wadati-Benioff zone, with a slab dipping at 45° to a maximum depth of approximately 250 km.

Station corrections and P- and S-velocity distribution correlate well with the major upper crust geological features of the area. The P- and S-velocity distribution for depth below 30 km shows a lateral velocity variation, which is associated with the subductionslab.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 1999. , 15 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 462
Keyword [en]
Earth sciences
Keyword [sv]
National Category
Earth and Related Environmental Sciences
Research subject
Geophysics with specialization in Seismology
URN: urn:nbn:se:uu:diva-994ISBN: 91-554-4533-0OAI: oai:DiVA.org:uu-994DiVA: diva2:173334
Public defence
1999-10-11, Axel Hamberg-salen, Geocentrum, Villavägen 16, Uppsala, Uppsala, 10:00
Available from: 1999-09-20 Created: 1999-09-20 Last updated: 2016-05-13Bibliographically approved

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