lava flow

• is the outcome of a convection 


  magma
• number of active volcanoes

  24
• number of recorded significant eruptions for the past 400 years

  42
• highest number of recorded eruptions

  less than 30 for taal volcano
• date of mount Pinatubo eruption 


  June 15 1991, the second largest land eruption for the 20th century
• Philippine archipelago sits in two active plate boundaries

  Eurasian plate and Philippine sea plate
• lava 


  magma (molten rock) that has reached the surface of the earth
• lava flow


  magma contacts surface and overflows downhill from different volcanic openings
• fluid


  low silica content

  high temperature

  low gas content
• viscous 


  high silica content

  low temperature

  high gas content
• lava flows


  fluid and viscous
• type of lava flow

  pahoehoe and aa
• pahoehoe


  fluid
• aa


  viscous
• response to lava flows: mayon volcano

  PHIVOCS

  media

  mayon observatory

  bulletins or advisories

  office of the president

  ndrrmc

  city or municipality drrmc

  media

  provincial drrmc
• Hawaii volcanoes 


  Mauna loa

  hualalai
• highlighted with a mid high risk hazards


  hawaii
• pahoehoe can transition to aa but aa can't transition into pahoehoe