Questo video realizzato con la collaborazione tra la Vulcano Disaster Assistance della US Geological Survey e l'IRIS EPO, mostra uno schema generico dell'attività sismica e
geologica di alcuni (ma non tutti) stratovulcano, a lungo dormienti,
osservati durante i mesi e le ore che precedono un'eruzione. Secondo gli scienziati, i terremoti che si verificano in prossimità e sotto i vulcani, rappresentano dei segnali d'allarme che preannunciano eventuali variazioni del volume dei gas vulcanici e del magma. *Animation & graphics by Jenda Johnson, Earth Sciences Animated.
*Narrated by Wendy Bohon, Informal Education Specialist, Incorporated Research Institutions for Seismology. *Reviewed by: Wendy McCausland, USGS—Volcano Disaster Assistance Program John Pallister, USGS—Volcano Disaster Assistance Program Jake Lowenstern, USGS Volcano Hazards. *Program Graphic of volcano interior modified from Richard Hill & Lisa Faust Maps from Google Earth. *Supported by: Volcano Disaster Assistance Program and National Science Foundation.
*Narrated by Wendy Bohon, Informal Education Specialist, Incorporated Research Institutions for Seismology. *Reviewed by: Wendy McCausland, USGS—Volcano Disaster Assistance Program John Pallister, USGS—Volcano Disaster Assistance Program Jake Lowenstern, USGS Volcano Hazards. *Program Graphic of volcano interior modified from Richard Hill & Lisa Faust Maps from Google Earth. *Supported by: Volcano Disaster Assistance Program and National Science Foundation.
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