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 |
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Authors: | Vyacheslav M Zobin Carlos Navarro Gabriel Reyes-Dávila Justo Orozco Mauricio Bretón Armando Tellez Gabriel Reyes-Alfaro Homero Vázquez |
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Institution: | Observatorio Vulcanológico, Universidad de Colima, Colima, Col., 28045,;Mexico. E-mail: Facultad de Ciencias, Universidad de Colima, Colima, Col., 28045,;México |
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Abstract: | 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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Keywords: | explosive earthquakes explosive eruption Volcán de Colima volcanic seismology |
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