Parts of a Volcano

refers to any pheno,enon of eruption of molten lava onto the surface

underground molten rocks forms in the lower part of Earths crust and the upper part of the mantle collected in magma chambers

may be formed when there is a rich source of magma hill, mountain, or fissure from which molten rocks, hot gases, and ash are ejected

volcanoes tend to form where plate boundaries interact and rigid plate molten rock materials from mantle may find their way out as hot plumes, these produce volcanic regions called

magma comes of of the _________, the central opening of a volcano connected to a magma chamber where the heated magma rises from underneath

long narrow cracks in the crust

some of the secondary vents, called ________, emit only gases

neatly circular depression that surrounds the vent

depressions are unusually large and are called _________ form when the summit of a volcano collapses, which occurs when the source of magma is used up

Types of Volcano Eruption

are driven by steam produced when groundwater is heated due to an underlying heat source

release of large quantities of accumulated magmatic gas, ...... forming voluminous cauliflower clouds

weak to violent eruptions characterized by lava fountains and outbursts of molten lava

occurs when gas-rich, pasty lava accumulates to form a dome on the volcano edfice or beneath its surface

result from an ejection of magmatic gases and steam produced by conversion of groundwater to steam by ascending magma

volminous ejections of pumice and ash flows

Types of Volcanoes

(stratovolanoes) produced when viscous lava of andesitic composition flows out over a long time

built from ejected lava fragments small, usualky less than 300m

volcanoes with no known record of eruption

Role of PHIVOLCS in Disaster Risk Management PHIVOLCS stands for?

PAGASA?

SOEPD

senors are placed on slopes of volcanoes

changws in the electromagnetic field due to the activity of magma are measured using special instruments

(PDZ) Circular area around a volcano that is at high risk to major volcanic hazards

Role of PHIVOLCS 1. predict occurence of volanic eruption and earthquake in PH 2. determine likely to be affected areas 3. generate data to forecast volcanic eruption & earthquake 4. prepare evacuation and plan preparedness

Volcanix Materials and Hazards fast movement of turbulent mass of fragmental volcanic materials with hot gases

streamlike flow of incandescent, molten rock materials erupted from volcano

shower of fine-to-course-grained volcanic materials airborne products of volcanic eruption

rapid-flowing thick mixture of volcanic material and water, created along river channels by extreme rainfall

high temperature mixture of water vapor, hydrogen sulfide, and sulfur dioxide released into the atmosphere harmful to health

massive collapse of a huge portion of a volcano, triggered by earthquake or volcanic eruption

waves brought abour by sudden displacement of water during an earthquake or undersea eruption

noneruptive event generated when groundwater comes in contact with still hot pyroclastic flow

Benifits from Volcano

monitoring volcanic activities