volcan merapi
DESCRIPTION
Presentación acerca de la evolucion geoquimica y eruptiva del Volcan Merapi en la Isla Java Central, IndondesiaTRANSCRIPT
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VOLCAN MERAPIJAVA CENTRAL,
INDONESIA“MONTAÑA DE FUEGO”
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UBICACION
V. Merapi
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CARACTERISTICAS
• 2968msnm
• 9630 ± 60 (14C) (Newhall et al, 2000)
• Estratovolcán
• Composición Andesitica
• El más sur de un alieneamiento volcanico N-S (Volcanes: Unguran, Telomoyo, Merbabu y Merapi)
• VEI aprox 4
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N
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V. Merapi
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Tomado de Müller y Haak, 2004
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Tomado de Gertisser y Keller, 2002
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Diagramas de variacion de algunos elementos con respecto al % de SiO2.Tomado de Gertisser y Keller, 2002
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Tomado de Voight et al, 2000
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Flujo de lava (1904 – 1907)
Tomado de Voight et al, 2000
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Observacion de Babadan sobre el flanco occidental del Merapi, 8 de Agosto de 1942.Tomado de Voight et al, 2000
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Tomado de Voight et al, 2000
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Candi Sambisari, cerca al aeropuerto de Yogyakarta, cubierto por ≥ 40 cm de ceniza fina y aproximadamente 6 m de sedimentos fluviales. Fotografia del 23 de Diciembre de 1981, durante las ultimas etapas de excavación. Tomado de Newhall et al, 2000.
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Tomado de Voight et al, 2000
NUÉES ARDENTES
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2006
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2006
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ACTIVIDAD RECIENTE 2010
• 13/09: columna de humo de 800m sobre el crater
• Resgistros de deformacion: Marzo/2010 (0.0039mm/dia – 0.3mm/dia) – 16 de septiembre (11mm/dia)
• 23 y 24/10: comienza a fluir lava
• 25/10: Nivel de alerta: 4 (CVGHM)
• 26/10: 232 sismos, 4 flujos de lava, 6 nubes ardientes, columna eruptiva de 1.5km
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• 29/10: caida de ceniza, Flujos piroclasticos
• 30/10: explosion, columna eruptiva de fuego de 2km , caida de ceniza en un radio de 10km
• 4/11: explosiones 5 veces mas fuertes que las del 26/10
• 5/11: zona de seguridad 20km alrededor, erupción mas fuerte desde 1872 y continua hasta el otro dia
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CONCLUSIONES• Caracterizado por flujos piroclasticos (nuées
ardentes)
• Ha sido casi continuamente activo desde la primer aparicion de magma rico en K en el Holoceno tardío
• Siglo XX: crecimiento efusivo de domos de lava voscosa; en el sigloXIX se presentaron erupciones mayores y mayor alcance longitudinal
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• La actividad eruptiva del 2010 ha sido mayor que las del siglo pasado (XX), y ha superado las 120 horas erupción que presento el volcan en el año 1872. Además los materiales expulsados han alcanzado los 14.5km comparado con 11-12km de los pasados 138 años
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REFERENCIAS
• BNPB (9 November 2010). "Rekor Baru Letusan Merapi" (in Indonesian). Badan Koordinasi Nasional Penanganan Bencana-Indonesian Disaster Management Office. http://bnpb.go.id/irw/berita.asp?id=129. Retrieved 9 November 2010
• "Global Volcanism Program, SI/USGS Weekly Volcanic Activity Reports-Merapi". Smithsonian Institution, 22–28 September 2010, Retrieved on 26 October 2010
• Pusat Vulkanologi & Mitigasi Bencana Geologi, Badan Geologi-Report eruption G. Merapi October 26, 2010, Monitoring Results-released, Wednesday, 27 October 2010 12:21". portal.vsi.esdm.go.id. 2010-10-27. http://portal.vsi.esdm.go.id/. Retrieved 2010-10-28.
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• Mt. Merapi Volcanic Activity, Information bulletin n° 2 GLIDE no. VO-2010-000214-IDN". International Red Cross/Red Cresent Societies. 1 November 2010. http://www.reliefweb.int/rw/RWFiles2010.nsf/FilesByRWDocUnidFilename/MMAH-8AT72A-full_report.pdf/$File/full_report.pdf. Retrieved 7 November 2010
• Center for Volcanology and Geological Hazard Mitigation, Geological Agency, Current status of Merapi, Level 4 (CAUTION)" (in Indonesian). portal.vsi.esdm.go.id. 2010-09-20. http://portal.vsi.esdm.go.id/. Retrieved 2010-10-27.
• Ralf Gertisser y Jörg Keller, 2002. Temporal variations in magma composition at Merapi Volcano (Central Java, Indonesia): magmatic cycles during the past 2000 years of explosive activity. Journal of Volcanology and Geothermal Research 123 (2003) 1-23.
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• B. Voighta,b, E.K. Constantinea, S. Siswowidjoyoc, R. Torleyd; 2000. Historical eruptions of Merapi Volcano, Central Java, Indonesia, 1768–1998. Journal of Volcanology and Geothermal Research 100 (2000) 69–138.
• A. Müller1 y V. Haak, 2004. 3-D modeling of the deep electrical conductivity of Merapi volcano (Central Java): integrating magnetotellurics, induction vectors and the effects of steep topography. Journal of Volcanology and Geothermal Research 138 (2004) 205– 222
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Cristian David Usma Cuervo