Authors: (Carrasco-Núñez, Gerardo, Siebert, Lee , Capra, Lucia, Centro de Geociencias, Universidad Nacional Autónoma de México, Campus UNAM, Juriquilla, Querétaro, Qro., Mexico, and others)
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Abstract:
Although relatively infrequent in comparison with other volcanic phenomena, volcanic avalanches are regarded as one of the most dangerous and catastrophic events affecting a volcano. Most commonly they are associated with eruptive activity that can be expressed as direct magmatic eruptions through dike or cryptodome intrusions, or as phreatic explosions; however, they can also occur in the absence of any contemporaneous magmatic or other eruptive component. Seismicity, or in smaller scale cases extreme precipitation, can trigger collapse of areas of a volcano that are already unstable. Therefore, an assessment of the unstable conditions affecting a volcano, together with a comprehensive study of its geological evolution, including the recognition of the magnitude and frequency of previous collapse events, as well as modeling of possible collapse scenarios is essential for hazard assessments. |
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