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Mt.Pinatubo
EileenDempsey
Luzon,PhilippineIslands
• Stratovolcano• Formedatasubduc?onzonewherethePhilippineMobileBeltisslidingovertheEurasianplatealongtheManilaTrench
• Andesite,Dacite
Tectonic setting of the Philippine Islands.
Eventsleadingtoerup?on
• 7.7magnitudeearthquake• Emissionofsteamandgases• Smalllandslides• Asuccessionofearthquakesincreasinginmagnitude
• Phrea?cerup?ons• Smallerup?onscon?nuedalongwithmanyearthquakes
• Smallmagma?cerup?ons
June7th,1991
• ThePhilippineIns?tuteofVolcanologyandseismologyissuedanerup?onwarningaMerthefirstlargeexplosion– 7mtallashcolumn
• Dailywarningsandupdatesweredeliveredbynewspaper,radio,television,anddoortodoor
• Forma?onofalavadomeatthesummit• June12th‐erup?onsbecameincreasinglyintense,witherup?oncolumns,pyroclas?cflows,andtephra
• Largetremors/earthquakes
• 1991June15therup?on‐– Pyroclas?cflows,ashdeposits,andlahars– Ultrapliniancolumn– 10billionmetrictonsofmagma– 100mthickpyroclas?cflows
– Typhoonrainscreatesmassivelahars– AshcouldcoveredallofcentralLuzon‐bringtotaldarkness
Tephrafallfrom1991erup?on
• 10?meslargerthanMt.St.Helens1980erup?on
• 800+peoplekilled
MajorCosts
• Displacedpeople/families• Ash+Typhoon=Roofcollapse• furthercostswereincurredinconstruc?ngdikesanddamstocontrolthepost‐erup?onlahars
• volumeoflavaandashinjectedsignificantquan??esofaerosolsanddustintothestratosphere
Currently…
• Ac?vitycon?nuedonasmallerscalethroughAugust
• By1992July,anewlavadomewasforming
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