Aspectos sismológicos y morfotectónicos en el extremo occidental de la Cordillera Volcánica Central de Costa Rica
Guardado en:
| Autores: | , , , , |
|---|---|
| Formato: | artículo original |
| Estado: | Versión publicada |
| Fecha de Publicación: | 2011 |
| Descripción: | An historical seismicity study in the near vicinity of Poas volcano (Central Volcanic Range), shows that five local, intermiate magnitude (5 < M ≤ 6.5), shallow focus (h < 20 km) earthquakes had affected these area, whith Mercalli Modified intensities between VII and IX grades. The earthquakes that occured on August 28, 1911, June 6, 1912 and September 1, 1955 had its focus approximately 5 km to the Southeast of the small town Bajos Toro. The remain two eartquakes that occurred on March 18, 185 and on December 30, 1888 had epicenter near Fraijanes. The last earthquakes caused damaged specially at the city of Alajuela, Heredia and San Jose. The Bajos Tor's earthquakes affected specially the towns of Grecia, Naranjo, Zarcero and Bajos Toro. There ir reference of landslides from the earthquakes. The Bajo Tor's earthquakes are possible related to a structural trend with a NNW-SSE orientation. There are different tectonic hypothesis in relation with the source of the Fraijanes earthquakes. A recurrence relation fot the earthquakes from this seismic zone is 34.3 ± 10.3 years. In the last 8 years four earthquake swarms have been detected in the vicinity of Platanar volcano (1980 and 1986) and Poas volcano (1980 and 1982). A portable seismic network installed during 1958 in the vicinity of Bajos del Toro, showed that the microearthquake activity is one event each two days. The seismic patterns obtained from this network shows relation with neotectonic controls of the region, that have NN-SE, NS and NNE-SSW trends |
| País: | Portal de Revistas UCR |
| Institución: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| Lenguaje: | Español |
| OAI Identifier: | oai:portal.ucr.ac.cr:article/12967 |
| Acceso en línea: | https://revistas.ucr.ac.cr/index.php/geologica/article/view/12967 |
| Access Level: | acceso abierto |