Volcanic Hazards. Limiting Danger from Hazards WarningWarning –Know when event is happening...
-
Upload
reynold-randall -
Category
Documents
-
view
215 -
download
0
Transcript of Volcanic Hazards. Limiting Danger from Hazards WarningWarning –Know when event is happening...
![Page 1: Volcanic Hazards. Limiting Danger from Hazards WarningWarning –Know when event is happening EducationEducation –Know what to do when an event happens.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649da35503460f94a905ad/html5/thumbnails/1.jpg)
Volcanic
Hazards
![Page 2: Volcanic Hazards. Limiting Danger from Hazards WarningWarning –Know when event is happening EducationEducation –Know what to do when an event happens.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649da35503460f94a905ad/html5/thumbnails/2.jpg)
Limiting Danger from Hazards
• Warning –Know when event is happening
• Education –Know what to do when an event
happens• Research
–Know what will happen in an event
![Page 3: Volcanic Hazards. Limiting Danger from Hazards WarningWarning –Know when event is happening EducationEducation –Know what to do when an event happens.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649da35503460f94a905ad/html5/thumbnails/3.jpg)
‘Water’ Volcanoes • Water that can be
hazardous that are due to magma or Lava– Geysers– Hot Springs– Fumaroles– Mud Pots
![Page 4: Volcanic Hazards. Limiting Danger from Hazards WarningWarning –Know when event is happening EducationEducation –Know what to do when an event happens.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649da35503460f94a905ad/html5/thumbnails/4.jpg)
Gases• Release from within
magma as pressure and temperature changes– Can cause explosive
eruptions– Can poison plants and
animals at surface– H2O, SO2, CO2, H2,
HCl, H2S, Fl
![Page 5: Volcanic Hazards. Limiting Danger from Hazards WarningWarning –Know when event is happening EducationEducation –Know what to do when an event happens.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649da35503460f94a905ad/html5/thumbnails/5.jpg)
Lava Flows• Streams of molten rock
– Some flow smoother and faster than others
• Depends on – Temperature– Chemical make-up
– Everything in the path of the lava is in danger
• Knocked over• Surrounded• Buried• Burned• Melted
![Page 6: Volcanic Hazards. Limiting Danger from Hazards WarningWarning –Know when event is happening EducationEducation –Know what to do when an event happens.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649da35503460f94a905ad/html5/thumbnails/6.jpg)
Explosions and “Stuff” that is Ejected During Eruptions
• ‘Ash Fall’• Tephra- lava and solid
material, blasted into the air, during an eruption– Volcanic Ash/Dust- Small
and very small material ejected during an eruption
– Volcanic Bombs- Pebble sized to massive boulders of ejected material
• Cinders- Small volcanic bombs the size of golf balls
![Page 7: Volcanic Hazards. Limiting Danger from Hazards WarningWarning –Know when event is happening EducationEducation –Know what to do when an event happens.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649da35503460f94a905ad/html5/thumbnails/7.jpg)
Pyroclastic Flows• Fast moving flow of hot
rock and gases• ‘Ash Flow’• Could include molten rock
as well• Rock includes small ash
and large boulders • Can move at 80 km/h• Reach temperatures of
700º C
![Page 8: Volcanic Hazards. Limiting Danger from Hazards WarningWarning –Know when event is happening EducationEducation –Know what to do when an event happens.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649da35503460f94a905ad/html5/thumbnails/8.jpg)
Landslides• Flow of rock and
debris • Can be caused
because weaker layers of rock give way and collapse
• Landslide may allow for other hazards; explosion, lava flow, or lahars
![Page 9: Volcanic Hazards. Limiting Danger from Hazards WarningWarning –Know when event is happening EducationEducation –Know what to do when an event happens.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649da35503460f94a905ad/html5/thumbnails/9.jpg)
Lahars• Mixture of water and rock
fragments flowing down a volcano’s slopes
• ‘Mud Flows’• Water often comes from
suddenly melted glaciers• May pick up more debris
while moving down slope• Water can be very hot
![Page 10: Volcanic Hazards. Limiting Danger from Hazards WarningWarning –Know when event is happening EducationEducation –Know what to do when an event happens.](https://reader035.fdocuments.in/reader035/viewer/2022062715/56649da35503460f94a905ad/html5/thumbnails/10.jpg)
Tsunamis• Eruptions can create
huge waves in large bodies of water located near a volcano