La falla Tobosi: Fuente del enjambre sísmico de Tobosi del 2011-2012 en el centro de Costa Rica

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

doi:10.15517/rgac.v53i0.21145

La falla Tobosi: Fuente del enjambre sísmico de Tobosi del 2011-2012 en el centro de Costa Rica

Translated title of the contribution: 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 contribution	Tobosi Fault: Source of the seismic swarm in Tobosi from 2011 to 2012 in central Costa Rica
Original language	Spanish
Pages (from-to)	89-102
Number of pages	14
Journal	Revista Geologica de America Central
Volume	53
DOIs	https://doi.org/10.15517/rgac.v53i0.21145
Publication status	Published - 8 Jun 2015

Keywords

seismic hazard
focal mechanisms
Tobosi
Costa Rica
earthquake swarm

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title = "La falla Tobosi: Fuente del enjambre s{\'i}smico de Tobosi del 2011-2012 en el centro de Costa Rica",

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.",

keywords = " seismic hazard, focal mechanisms, Tobosi, Costa Rica, earthquake swarm",

author = "Araya, {Maria Cristina} and Lepolt Linkimer and Walter Montero and Wilfredo Rojas",

year = "2015",

month = jun,

day = "8",

doi = "10.15517/rgac.v53i0.21145",

language = "Spanish",

volume = "53",

pages = "89--102",

journal = "Revista Geologica de America Central",

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publisher = "Universidad de Costa Rica",

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T1 - La falla Tobosi

T2 - Fuente del enjambre sísmico de Tobosi del 2011-2012 en el centro de Costa Rica

AU - Araya, Maria Cristina

AU - Linkimer, Lepolt

AU - Montero, Walter

AU - Rojas, Wilfredo

PY - 2015/6/8

Y1 - 2015/6/8

N2 - 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.

AB - 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.

KW - seismic hazard

KW - focal mechanisms

KW - Tobosi

KW - Costa Rica

KW - earthquake swarm

U2 - 10.15517/rgac.v53i0.21145

DO - 10.15517/rgac.v53i0.21145

M3 - Article (Academic Journal)

SN - 0256-7024

VL - 53

SP - 89

EP - 102

JO - Revista Geologica de America Central

JF - Revista Geologica de America Central

ER -

La falla Tobosi: Fuente del enjambre sísmico de Tobosi del 2011-2012 en el centro de Costa Rica

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