The methodology of quantification of volcanic explosions from broad-band seismic signals and its application to the 2004-2005 explosions at Volcán de Colima, Mexico

Details The methodology of quantification of volcanic explosions from broad-band seismic signals and its application to the 2004-2005 explosions at Volcán de Colima, Mexico The methodology of quantification of volcanic explosions from broad-band seismic signals and its application to the 2004-2005 explosions at Volcán de Colima, Mexico

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006geoji.167..467z&link_type=abstract

Geophysical Journal International, Volume 167, Issue 1, pp. 467-478.

Astronomy and Astrophysics

Astronomy

11

Explosive Earthquakes, Explosive Eruption, Volcán De Colima, Volcanic Seismology

Scientific paper

A methodology is proposed for the quantification of volcanic explosions based on three parameters derived from broad-band seismic signals: the counter force of the eruption F, the power of the explosion P and the duration of the upward movement of the gas slug in the conduit to the free surface of magma, D. This methodology was applied to the 2004-2005 sequence of explosions at Volcán de Colima, Mexico. The broad-band records of more than 100 explosive events were obtained at a distance of 4 km from the crater. We determined the counter force of the eruption by modelling the low-frequency impulse of the seismic records of 66 volcanic explosions and estimated the power of 116 explosions from the spectra of the high-frequency impulse. The power of Colima explosions spans five orders of magnitude; the counter force spans four orders of magnitude. We show that the power of a volcanic explosion is proportional to the counter force of the eruption. These parameters may be used for the elaboration of a scale of volcanic explosions.

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