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Geofísica internacional

versión On-line ISSN 2954-436Xversión impresa ISSN 0016-7169

Geofís. Intl vol.44 no.2 Ciudad de México abr./jun. 2005

 

Articles

A seismic attenuation zone below Popocatépetl volcano inferred from coda waves of local earthquakes

D. A. Novelo-Casanova1 

A. Martínez-Bringas2 

1 Instituto de Geofísica, Universidad Nacional Autónoma de México, 04510 México, D.F., México Email: david@ollin.igeofcu.unam.mx

2 Centro Nacional de Prevención de Desastres (CENAPRED), 04360 México, D. F., México Email: amb@cenapred.unam.mx


ABSTRACT

Using a single scattering model, weighted averages of the quality factor <Q c > were estimated at 6 Hz for coda wave windows 25s after S-wave arrival at depths ranging from 2 to 10 km and magnitudes between 2 and 3. Considering Q c -1 as intrinsic attenuation, we find a zone of seismic wave attenuation between 6 and 8 km depth attributed to the presence of magma and partial melting of rock.

KEY WORDS: Coda waves; Popocatépetl volcano; coda Q; quality factor; attenuation

RESUMEN

Utilizando un modelo de dispersión simple, los promedios pesados del factor de calidad <Qc> fueron estimados a 6 Hz para ventanas de ondas coda de 25s después de la llegada de la onda S con profundidades en el rango de 2 a 10 km y magnitudes entre 2 y 3. Considerando Q c -1 como atenuación intrínsica, encontramos una zona de atenuación sísmica entre los 6 y 8 km de profundidad atribuida a la presencia de magma y al derretimiento parcial de roca.

PALABRAS CLAVE: Ondas coda; volcán Popocatépetl; coda Q; factor de calidad; atenuación

Full text available only in PDF format.

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Received: September 11, 2003; Accepted: May 27, 2004

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