The Tobosi fault: source of the 2011-2012 Tobosi earthquake swarm in central Costa Rica

Revista Geologica de America Central

Rojas, Wilfredo¹  Linkimer, Lepolt¹  Araya, María C.¹  Montero, Walter¹ 

[1] Universidad de Costa Rica, San Pedro, CR

关键词: Active fault;    earthquake swarm;    seismic hazard;    Tobosi;    Costa Rica;    focal mechanisms.;   

DOI  :  10.15517/rgac.v53i0.21145

学科分类：地质学

来源: Universidad de Costa Rica * Editorial

【 摘 要 】

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.

【 授权许可】

Unknown