Science 3rd qtr1

• mt. pinatubo - one of the composite volcanoes that constitute the Luzon volcanic arc.
• June 15 1991 - date pinatubo erupted
• Philippine Institute of Volcanology and seismology- PHIVOLCS
• 19 eruptions- many times that pinatubo erupted
• Zambales, Pampanga,Tarlac - provinces that Pinatubo blanketed.
• Viscosity - resistance to flow of a lava determines how easily gas escapes in the atmosphere
• Silicic Rocks - rocks that mainly composed of silica (700C)
• Mafic rocks- deficient rocks that containing silica at 50% lower
• Explosive and effusive -two types of eruptions
• • explosive eruptions - characterized by gas driven explosion that propels magma and tephra
• effusive eruptions - eruption which featre the outpouring lava withouy significant explosive eruption.
• Magmatic,Phreatomagmatic, phreatic eruptions - 3 volcanic eruption according to metatype
• Hawaiian - eruption named after the Kilauea Volcano.
• Hawaiian - is the calmnest eruption types
• Strombolian- eruption driven by the bursting of gas bubbles within the magma.
• Vulcanian - eruption named after the Italian Island Volcano
• Hephaestus - vulcan of Romans
• Vulcanian - explosive eruption that occurs when the pressure of entrapped gases in a relatively viscous magma.
• Pelean - also called as nuee ardante eruption
• Peelean - eruption when a large quantity of gas, dust, ash, and lava fragments are blown out.
• Plinian - most powerful and explosive eruption
• Surtseyan - eruption named after the islanf of surtseyan off the coast of Iceland.
• surtseyan - hydro magmatic eruption where magma interacts exposively with water.
• submarine - type of an eruption that takes place beneath the surface of the water
• Sublacial eruption - also known as glaciovolcanism which features the interaction between lava and ice often under a glacier.
• Phreatic eruptions - (steam blast eruption) are those driven by explosive steam resulting from cold ground.
• Magnitude - energy released by an earthquake
• Ritcher Scale - use to measure magnitude
• Intensity - the effect of an earthquake
• mercalli intensity scale - use to measure intensity
• volcanic process - refers to the eruptive and non eruptive activities that take place on a volcano.
• Pahoehoe lava - is a relatively smooth lava flow that cools down forming typical smooth billowy/ ropey surface.
• A'a Lava - which is characterized by fragmented, rough, sometimes spiny or blocky surface.
• Clarence Edward Dutton - introduced the Pahoehoe Lava and A'a lava
• Pyroclastic surge - ground nugging radial cloud that develop along with the eruption column