Wednesday, March 25, 2009

volcano blog

type of volcano
-complex volcano(made of many different kinds of volcanoes)
-Pacific and Philippine Plates are subducting under the Eurasian Plate


geologic location
-Kyushu, Japan
-located where the Pacific and Philippine Plates are subducting under the Eurasian Plate

eruption history
most famous eruption:
The last major eruption was recorded in 1991. It was the first time in 198 years. Due to the dome formation, there were pyroclastic flows. The domes formed lava by rising to the vent of the volcano and solidifying.The area of eruption was by the Fungen-dake(dome). There were 43 people killed and left many homeless.The families that evacuated lost everything.

most recent eruption:
The last small eruption was May 1, 1996. It created small pyroclastic flows as a result of a dome partially collapsing.


volcano shape
-composed of domes as a result of previous eruptions
-tallest(Fugen-dake) has a height of 2502.365 meters
-3 main Stratovolcanoes
*large, steep volcanoes built up of alternating layers of lava and ash/cinder

Kinugasa is in the north.
Fugen-dake & Mayu-yama are in the east(center).
Kusenbu is in the south.

neighboring volcanoes
-Aso
-Kirishima
-Sakura-jima

-Fugi another volcano in Japan

eruption style
lava type: mostly dacitic, and andesitic-can be explosive-pyroclastic flows are common because of the domes


enviromental dangers/benifits
-Lahars are common.
-Pyroclastic flows are common because of the domes which collapses and erupts.
-Lava flow is common.

other sites worth visiting:)
http://volcano.oregonstate.edu/

http://vulcan.wr.usgs.gov/

http://www.geology.sdsu.edu/how_volcanoes_work/

http://whistlerarenal.blogspot.com/



citations
book reference:
Volcano and Earthquake. United States: DK, 2004.

online references:
Kuno, H., 1962, Part XI, Japan, Taiwan and Marianas: Catalogue of the active volcanoes of the world including solfatara fields, International Association of Volcanology, Rome, Italy, 332 p.

Simkin, T., and Siebert, L., 1994, Volcanoes of the World: Geoscience Press, Tucson, Arizona, 349 p.

"Mount Unzen." Encyclopædia Britannica. 2009. Encyclopædia Britannica Online. 27 Mar. 2009

picture:
Sakuma S., Nakada S., Uto K. (2004), Unzen Scientific Drilling Project: Challenging drilling operation into the magmatic conduit shortly after eruption, American Geophysical Union, Fall Meeting 2004