Question
no answers needed on this page
no answers needed on this page
just these two
Hazard Assessment Overvlew. Kilauea, on the Big Island of Hawai, is one of the most active volcanoes in the world. Because Kilaue erupts so frequently, it poses serious hazards to residents and the surrounding environment. The scientists at the Hawaiian Volcano Observatory (HVO) continually monitor Kilauea's eruptive and gas activity in order to make predic tions and assess the dangers to people and properties in the region. The eruptive activity from Kilauea originates from the summit caldera and the east or southwest rift zones. As an HVO scientist you will be assessing the natural hazards associated with Kilauea's activity including the dangers to people and properties in the region. You have just observed new activity at Pu'u O'o cone, a cinder-and-spatter cone located in the east rift zone (the movie in the Background section above). The Volcanically active part of Hawaii. AREA Mountain Viw http://hvo.wr.usgs.gov/kilauea/ Kilauea map.htm Koa Kilauea North Pole Kilauea Iki Pohoiki EAST RIFT ZONE Halema uma u Kamu SE Trade EXPLANATION Main roads present today District boundary South Pole cific Ocean I- Darker color marks pproximate General Atmospheric circulation 10 KILOMETERS Town O Crater Town buried by lava http://www.nps.gov/archive/grsa/resources/cur- riculum/mid/dunes/photo_ files/giobal_wind.htnm 10 MILES! I've carefully overlayed a geologic map on top of the area's topographic map. Using the map find the old 1977 flow near Kalapana: The 1977 lava flow moved in which direction? What is the gradient of the 1977 lava flow (in ft/mile)? .Note that some flows have added land to the coastline. The topo map is from 1981. Outline the land added to the Kaimu Beach Park by the 1986-1992 flows
Explanation / Answer
* If the flow viscosity increase then AA type of lava flow will occur which is a rubby flow with molten core with higher viscosity which tends to move more slowly and produce thicker flows typically 3-20m.
Yes this occur when the flow travels away from the vent because at the vent high temperature is there thus viscosity of the flow decreases at high temperature and produce pahoehoe lava flow and away from the vent there is less temperature and hence AA type of lava flows found.
*If this were more felsic erruption then the lava flow will be as or blocky type lava flows as felsic lava has high concentration of silica it resistant to lava flows,felsic lava has highest conc.of silica and low in magnesium content.if there were felsic lava flows then formation of stiff domes were taking place.
