Central American Seismic Center (CASC)

Alvarenga, E.; Barquero, Rafael; Boschini, Ileana; Escobar, Juan Paulo Martínez; Fernández, Mariela; Mayol, P.; Havskov, Jens; Papí-Gálvez, Natalia; Hernández, Z.; Ottemöller, Lars; Pacheco, Jesús; Redondo, Carlos A.; Rojas, Wilfredo; Vega, Francisco Beltrán-Díaz De La; Talavera, E.; Taylor, Wanda J.; Tapia, Aurioles; Tenório, Caio Miachon; Toral, J.

doi:10.1785/gssrl.69.5.394

Cited by 9 publications

(2 citation statements)

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“…The data set used in this study was extracted from the Central American Seismic Center (CASC) database (Alvarenga et al 1998) and covers the period 1997–2000. The CASC database presents a joint effort by the local institutions in the regions that run independent seismic networks.…”

Section: Datamentioning

confidence: 99%

LgwaveQtomography in Central America

Ottemöller

2002

Geophysical Journal International

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Summary The lateral variation of Lg wave spectral attenuation in Central America was studied through tomographic inversion at various frequencies between 0.5 and 5 Hz, separately for each frequency. The input data set consisted of 558 travel paths recorded on short‐period and broad‐band seismic stations in the region. The size and quality of the data set were sufficient to resolve significant lateral variation in the Lg wave quality factor QLg. The average dependence of QLg with frequency was found to be QLg(f) = 182f0.84, corresponding to high attenuation. Low QLg values in the Nicaraguan Depression presented the most significant variation from the average. The strong attenuation of Lg waves in the Nicaraguan depression was also observed in the visual analysis of the seismograms. This observation is possibly explained by the near‐surface low‐velocity layers in the depression. Low QLg values were also found along the chain of volcanos due to increased scattering and partial melting beneath the volcanic belt. This study is the first attempt to determine QLg for Central America and to provide knowledge on attenuation of Lg waves needed for the prediction of ground motion during future earthquakes.

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Section: Datamentioning

confidence: 99%

LgwaveQtomography in Central America

Ottemöller

2002

Geophysical Journal International

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“…Surrounding these two networks are other Central American national and regional networks that record seismic events in the region. All networks send information to the Central America Seismic Center (CASC), which is situated in Costa Rica (Alvarenga et al, 1998). The RSN data set used in this study was collected from the CASC seismic center.…”

Section: Station Distribution In Costa Rica and Surrounding Regionsmentioning

confidence: 99%

An improved P-wave velocity reference model for Costa Rica

Quintero

Kissling

2001

GeofInt

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Derivamos un modelo de velocidad unidimensional para la onda P en Costa Rica, el cual puede servir en la rutina de localización de eventos sísmicos y como modelo de referencia para tomografía en 3 dimensiones. La inversión para la velocidad es realizada usando 822 sismos con buena ubicación y 14 774 observaciones de la onda P, las cuales fueron obtenidas combinando datos de tiempos de arribo de 10 335 eventos en el periodo 1984-1997 colectados por el Observatorio Vulcanológico y Sismológico de la Universidad Nacional de Costa Rica (OVSICORI-UNA) y 3510 eventos en el periodo 1992-1998 colectados por la Red Sismológica Nacional (RSN). Durante el proceso de fusión, se tomó un cuidado estricto para reducir el número de errores en los datos, y en particular, para adaptar, corregir y completar los parámetros de las estaciones sísmicas. Un modelo de velocidad unidimensional es prerrequisito para tal proceso de fusión cuando la consistencia y calidad tienen prioridad sobre la totalidad del resultante juego de datos. Los datos finales para el periodo 1984-1998 en Costa Rica consiste de 11 848 eventos locales con 13 2331 observaciones de ondas P y 86 018 de ondas S.

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