Mecanismos focales de los sismos sentidos en Costa Rica durante el año 2024
Date
Authors
Linkimer Abarca, Lepolt
Fallas Salazar, Carolina
Arroyo Hidalgo, Ivonne Gabriela
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Este estudio presenta 139 nuevos mecanismos focales elaborados en el marco del resumen anual de la sismicidad del año 2024. En total, la Red Sismológica Nacional (RSN) localizó 5378 eventos, cuya energía conjunta equivale a un sismo de magnitud momento (Mw) 6,6. Solo el ~3,8 % (204) del total de sismos fue percibido por la población. Los mecanismos focales y las localizaciones de estos eventos permitieron agrupar su origen en cinco categorías: fallamiento en las placas cabalgantes Caribe y Panamá, zona interplacas de la subducción de la placa Coco, deformación interna de la placa Coco subducida, fallamiento del límite entre las placas Coco y Nazca y fallamiento de la placa Coco previo a la subducción. Los sismos superficiales (< 35 km) en las placas cabalgantes, al igual que los asociados con el límite Coco-Nazca, ocurrieron principalmente en fallas de desplazamiento de rumbo, mientras que los relacionados con subducción fueron de tipo inverso. Los diez sismos sentidos más relevantes en 2024 alcanzaron magnitudes Mw 5,5-6,2. La intensidad máxima observada fue de V, en áreas muy reducidas cerca de los epicentros de seis eventos (Mw 4,9 y 6,2).
This study presents 139 new focal mechanisms calculated in the context of the annual seismicity review of 2024. In total, the National Seismological Network (RSN) located 5378 events, whose combined energy is equivalent to an earthquake of moment magnitude (Mw) 6.6. Only ~3.8 % (204) of the earthquakes were perceived by the population. The focal mechanisms and locations of these events allowed the earthquake source to be grouped into five categories: faulting in the Caribbean and Panama upper plates, interplate seismogenic zone of the Cocos plate, internal deformation of the subducted Cocos plate, faulting in the boundary between the Cocos and Nazca plates, and faulting in the Cocos plate prior to subduction. The shallow (< 35 km) earthquakes in the upper-plates and in the Coco-Nazca boundary occurred mainly on strike-slip faults, while those related to subduction were reverse. The ten most significant earthquakes felt in 2024 reached magnitudes of Mw 5.5-6.2. The maximum intensity was V, observed in very small areas near the epicenters of six earthquakes (Mw 4.9 and 6.2).
This study presents 139 new focal mechanisms calculated in the context of the annual seismicity review of 2024. In total, the National Seismological Network (RSN) located 5378 events, whose combined energy is equivalent to an earthquake of moment magnitude (Mw) 6.6. Only ~3.8 % (204) of the earthquakes were perceived by the population. The focal mechanisms and locations of these events allowed the earthquake source to be grouped into five categories: faulting in the Caribbean and Panama upper plates, interplate seismogenic zone of the Cocos plate, internal deformation of the subducted Cocos plate, faulting in the boundary between the Cocos and Nazca plates, and faulting in the Cocos plate prior to subduction. The shallow (< 35 km) earthquakes in the upper-plates and in the Coco-Nazca boundary occurred mainly on strike-slip faults, while those related to subduction were reverse. The ten most significant earthquakes felt in 2024 reached magnitudes of Mw 5.5-6.2. The maximum intensity was V, observed in very small areas near the epicenters of six earthquakes (Mw 4.9 and 6.2).
Description
Keywords
sismicidad, Costa Rica, subducción, estadística sísmica, energía sísmica, intensidad sísmica, seismicity, subduction, earthquake statistics, seismic energy, seismic intensity