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Geofísica internacional
On-line version ISSN 2954-436XPrint version ISSN 0016-7169
Geofís. Intl vol.44 n.2 Ciudad de México Apr./Jun. 2005
SHORT NOTE
Earthquake families in the seismicity of Popocatépetl volcano
1 Instituto de Geofísica, Universidad Nacional Autónoma de México, 04510 México, D.F., México
2 Posgrado en Ciencias de la Tierra, Universidad Nacional Autónoma de México, 04510 México, D.F., México
Analysis of the seismicity of Popocatepétl volcano (Central Mexico) over the period September 1 to December 31, 1995, shows the existence of three earthquake families, with correlation coefficients better than 0.5 in all components of three stations. For two families the events have similar magnitudes and occur over a relatively long period of time. This suggests that they are of the asperity type. They occur up to a depth of 4 km below sea level underneath the volcano, and may be generated by the passage of magma through the upper volcanic conduits.
KEY WORDS: Mexican volcanoes; volcano seismicity; Popocatépetl volcano; earthquake families
El análisis de la sismicidad asociada al volcán Popocatépetl (Meseta Central, México) en el periodo 1 de septiembre a 31 de diciembre de 1995 permitió la identificación de 3 familias de temblores. El coeficiente de correlación encontrado para todos los miembros de las familias es mayor de 0.5 en todas las componentes de 3 estaciones cercanas a los epicentros. Los eventos de dos de las familias son de similar magnitud y ocurren dentro de un período relativamente largo. Esto sugiere que sean generados por la acción de una misma aspereza. Los hipocentros de los eventos se localizan bajo el edificio volcánico a profundidades de hasta 4 km bajo el nivel del mar y fueron generados probablemente por el paso de magma a través de los conductos volcánicos superiores.
PALABRAS CLAVE: Volcanes mexicanos; sismicidad volcánica; familias de temblores; volcán Popocatepetl
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Received: April 02, 2002; Accepted: August 02, 2004
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