Tobosi Fault: Source of the seismic swarm in Tobosi from 2011 to 2012 in central Costa Rica

Maria Cristina Araya, Lepolt Linkimer, Walter Montero, Wilfredo Rojas

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Abstract

The Central Costa Rica Deformed Belt (CCRDB) is an ~100-km broad zone of deformation that marks the boundary between the Caribbean Plate and the Panama Microplate. From December 2011 to February 2012, an earthquake swarm took place in a portion of the CCRDB, near the town of Tobosi, 7 km southwest of the city of Car- tago. In this study, data recorded by the National Seismological Network of Costa Rica (RSN: UCR-ICE) is used to relocate the earthquakes and calculate their focal mechanisms. Additionally, the tectonic geomorphology of the region is analyzed. The results show a transtension structure near the town of Tobosi, which comprises at least three faults, named: the Tobosi, Tablon, and Alumbre faults. It was found that the Tobosi fault is an active left-lateral strike-slip fault with a normal component and was the source of the Tobosi earthquake swarm.
Translated title of the contributionTobosi Fault: Source of the seismic swarm in Tobosi from 2011 to 2012 in central Costa Rica
Original languageSpanish
Pages (from-to)89-102
Number of pages14
JournalRevista Geologica de America Central
Volume53
DOIs
Publication statusPublished - 8 Jun 2015

Keywords

  • seismic hazard
  • focal mechanisms
  • Tobosi
  • Costa Rica
  • earthquake swarm

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