Philippine Standard Time
 

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What is a volcano?
  • A vent, hill or mountain from which molten or hot rocks with gaseous material have been ejected
  • Also craters, depressions, hills or mountains formed by removal of pre-existing material or by accumulation of ejected materials
Why does the Philippines have many volcanoes?
Volcanic hazards directly associated with eruption
Volcanic hazards indirectly associated with eruption

Volcanic Hazards

LAVA FLOW

Lava flows are rivers of incandescent of molten rock or lava moving downslope or away from an eruption vent. Lava flows composed of low silica magma have low viscosities and tend to flow at high speeds (kilometers per hour), while those composed of high silica magma have high viscosities and tend to move slowly (kilometers per day).  Steep slopes encourage faster and longer flows than gentle slopes or terrain.

TEPHRA FALL or ASHFALL and BALLISTIC PROJECTILES
PYROCLASTIC DENSITY CURRENTS or PDCs
LATERAL BLASTS
VOLCANIC GAS
LAHAR
DEBRIS AVALANCHE (SECTOR COLLAPSE)
VOLCANIC TSUNAMI
GROUND SUBSIDENCE and FISSURING
SECONDARY EXPLOSIONS, PDCs and ASHFALL

mt mayon5

Mayon Volcano 


 

pvo2

Pinatubo Volcano


 

KVO

Kanlaon Volcano


 

HVO2

Hibok-hibok Volcano


 

taal

Taal Volcano


 

bulusan

Bulusan Volcano