Podcast
Questions and Answers
Which eruption type is characterized by a tall column reaching up to 20 km high, accompanied by pyroclastic flow and ash fall tephra?
Which eruption type is characterized by a tall column reaching up to 20 km high, accompanied by pyroclastic flow and ash fall tephra?
- Plinian
- Phreatomagmatic
- Vulcanian (correct)
- Strombolian
The eruption of Mt. Fukutoku-Okanoba is characterized by:
The eruption of Mt. Fukutoku-Okanoba is characterized by:
- Fountain lava and periodic weak to violent eruption
- Tall eruption columns reaching up to 20 km
- Excessively explosive gas and pyroclastics
- A large column of fine ash, high speed and side-way emission of pyroclastics (correct)
Which Philippine volcano has erupted the most times since records have been kept?
Which Philippine volcano has erupted the most times since records have been kept?
- Mt. Kanlaon
- Mt. Mayon (correct)
- Taal Volcano
- Mt. Bulusan
Which of the following volcanoes experienced Plinian type of eruption?
Which of the following volcanoes experienced Plinian type of eruption?
What type of eruption is characterized by fountain lava?
What type of eruption is characterized by fountain lava?
What geological feature is most commonly associated with an emptied magma chamber and subsequent sinking of the ground?
What geological feature is most commonly associated with an emptied magma chamber and subsequent sinking of the ground?
Which of the following best describes a dormant volcano?
Which of the following best describes a dormant volcano?
What geological process is primarily responsible for the formation of volcanoes at subduction zones?
What geological process is primarily responsible for the formation of volcanoes at subduction zones?
Which type of volcanic eruption is characterized by the interaction of hot rocks coming in contact with water?
Which type of volcanic eruption is characterized by the interaction of hot rocks coming in contact with water?
What distinguishes a phreatomagmatic eruption from a phreatic eruption?
What distinguishes a phreatomagmatic eruption from a phreatic eruption?
Which is an example of a volcano formed by a tectonic plate moving over a hot spot?
Which is an example of a volcano formed by a tectonic plate moving over a hot spot?
What can occur following the collapse of a volcano?
What can occur following the collapse of a volcano?
Where is Edinburgh Castle located, in relation to volcanic activity?
Where is Edinburgh Castle located, in relation to volcanic activity?
What is the primary material emitted from a volcano during an eruption?
What is the primary material emitted from a volcano during an eruption?
Which of the following best describes the formation of a shield volcano?
Which of the following best describes the formation of a shield volcano?
What characteristic is most closely associated with a stratovolcano?
What characteristic is most closely associated with a stratovolcano?
How does the viscosity of lava differ between shield and stratovolcanoes?
How does the viscosity of lava differ between shield and stratovolcanoes?
Which of the following best describes a caldera?
Which of the following best describes a caldera?
The magma that forms the lava in stratovolcanoes is often described as:
The magma that forms the lava in stratovolcanoes is often described as:
Mauna Kea is characterized as which type of volcano?
Mauna Kea is characterized as which type of volcano?
What is a common characteristic of eruptions from shield volcanoes?
What is a common characteristic of eruptions from shield volcanoes?
Which volcanic hazard is capable of generating tsunamis?
Which volcanic hazard is capable of generating tsunamis?
Which of the following volcanic gases is known to be irritating to the eyes, skin, and respiratory system?
Which of the following volcanic gases is known to be irritating to the eyes, skin, and respiratory system?
What are the causes of lahar?
What are the causes of lahar?
Which of the following best describes 'tephra'?
Which of the following best describes 'tephra'?
What is the primary driving force behind pyroclastic flows?
What is the primary driving force behind pyroclastic flows?
Which of the following can cause the blocking of tributary streams and subsequent formation of a lake?
Which of the following can cause the blocking of tributary streams and subsequent formation of a lake?
What is considered the second largest volcanic eruption of the twentieth century as detailed in the content?
What is considered the second largest volcanic eruption of the twentieth century as detailed in the content?
What is the primary purpose of hazard maps in relation to volcanic activity?
What is the primary purpose of hazard maps in relation to volcanic activity?
What is a significant danger associated with tephra falls?
What is a significant danger associated with tephra falls?
Which alert level indicates the highest risk, with a hazardous eruption ongoing?
Which alert level indicates the highest risk, with a hazardous eruption ongoing?
What does a 'Permanent Danger Zone' (PDZ) signify in the context of volcano preparedness?
What does a 'Permanent Danger Zone' (PDZ) signify in the context of volcano preparedness?
What is a key recommendation people should follow in terms of long-term development planning, according to the content?
What is a key recommendation people should follow in terms of long-term development planning, according to the content?
What does 'Alert Level 2' indicate about a volcano's condition?
What does 'Alert Level 2' indicate about a volcano's condition?
Besides lava flows, what other type of ground-based volcanic impact can hazard maps help illustrate?
Besides lava flows, what other type of ground-based volcanic impact can hazard maps help illustrate?
Before a volcanic eruption, what is the most important action regarding family emergency plans?
Before a volcanic eruption, what is the most important action regarding family emergency plans?
What is the most important action to take before a volcanic eruption?
What is the most important action to take before a volcanic eruption?
During a volcanic eruption, what is the recommended action regarding vehicle use?
During a volcanic eruption, what is the recommended action regarding vehicle use?
At what alert level would you expect magma to have moved close to the crater?
At what alert level would you expect magma to have moved close to the crater?
What should you do immediately if caught in an ash or tephra fall?
What should you do immediately if caught in an ash or tephra fall?
During a volcanic eruption, what precautionary measure should be taken regarding household appliances?
During a volcanic eruption, what precautionary measure should be taken regarding household appliances?
What is the safest approach to drinking water during a volcanic eruption?
What is the safest approach to drinking water during a volcanic eruption?
After a volcanic eruption, when is it safe for families to return home?
After a volcanic eruption, when is it safe for families to return home?
What action should be taken regarding ash fall during an eruption?
What action should be taken regarding ash fall during an eruption?
If living near a volcano what should be the first action after an ash fall stops?
If living near a volcano what should be the first action after an ash fall stops?
Flashcards
Volcano
Volcano
A mountain where lava comes from a magma chamber.
Magma
Magma
Hot, liquid rock located beneath the Earth's surface.
Shield Volcano
Shield Volcano
A type of volcano with broad, gently sloping sides made from fluid lava flows.
Stratovolcano
Stratovolcano
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Caldera
Caldera
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Basalt
Basalt
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Tephra
Tephra
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Viscosity
Viscosity
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Phreatomagmatic Surge
Phreatomagmatic Surge
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Strombolian Eruption
Strombolian Eruption
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Vulcanian Eruption
Vulcanian Eruption
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Plinian Eruption
Plinian Eruption
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Active Volcanoes in the Philippines
Active Volcanoes in the Philippines
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Collapsed Volcanoes
Collapsed Volcanoes
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Caldera Volcanoes
Caldera Volcanoes
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Active Volcanoes
Active Volcanoes
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Dormant Volcanoes
Dormant Volcanoes
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Extinct Volcanoes
Extinct Volcanoes
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Subduction Process
Subduction Process
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Phreatic Eruption
Phreatic Eruption
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Phreatomagmatic Eruption
Phreatomagmatic Eruption
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Pinatubo
Pinatubo
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Volcanic Gas
Volcanic Gas
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Carbon Dioxide (CO2)
Carbon Dioxide (CO2)
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Lahar Hazard
Lahar Hazard
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Ballistic Projectiles
Ballistic Projectiles
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Pyroclastic Flow
Pyroclastic Flow
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Ash Fall
Ash Fall
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Volcanic Alert Levels
Volcanic Alert Levels
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Family Emergency Plan
Family Emergency Plan
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Evacuation Areas
Evacuation Areas
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Safety During Eruption
Safety During Eruption
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Protective Measures for Ash Fall
Protective Measures for Ash Fall
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Cook Food Thoroughly
Cook Food Thoroughly
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House Inspection After Eruption
House Inspection After Eruption
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Cleaning Up Ash Fall
Cleaning Up Ash Fall
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Alert Level 0
Alert Level 0
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Alert Level 1
Alert Level 1
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Alert Level 2
Alert Level 2
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Alert Level 3
Alert Level 3
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Alert Level 4
Alert Level 4
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Permanent Danger Zone (PDZ)
Permanent Danger Zone (PDZ)
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Hazard Maps
Hazard Maps
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Volcanic Preparedness
Volcanic Preparedness
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Study Notes
Disaster Readiness and Risk Reduction (Week 6)
- Disaster preparedness includes actions taken before, during, and after a volcanic eruption.
- Volcanoes are mountains where lava (hot, liquid rock) comes from a magma chamber under the ground.
- Most volcanoes have a volcanic crater at the top.
- Active volcanoes may erupt again at any time.
- Dormant volcanoes are currently quiet but could erupt in the future.
- Extinct volcanoes have not erupted in historical times.
Volcanic Hazard
- Tsunami: Sea waves generated by sudden displacement of water during underwater eruptions or debris avalanches.
- Volcanic Gas: Gases released by volcanoes can be concentrated and toxic to vegetation and people.
- Carbon dioxide (CO2): Trapped in low-lying areas, can be lethal.
- Sulfur dioxide (SO2): Irritating to eyes, skin, and respiratory system.
- Hydrogen sulfide (H2S): Very toxic in high concentrations.
- Hydrogen halides (HF, HCl, HBr): Strong, toxic acids.
- Ashfall: Harmful to human health, especially those with respiratory or cardiac problems.
- Causes disruption to land and air transportation, water and power supply, communications, drainage canals and sewerage.
- Damages buildings, agriculture, and wildlife.
- Lahars: Flowing thick mixture of volcanic sediments and water.
- Often triggered by intense rainfall during typhoons, monsoons, and thunderstorms.
- Can destroy by impact on bridges, roads, houses.
- Can create a lake that can eventually flood.
- Tephra Falls and Ballistic Projectiles:
- Includes all sizes of rock fragments and lava blobs ejected into the atmosphere.
- Accumulate as deposits.
- Larger fragments are hurled with great force from the volcano.
- Pyroclastic Flow: A high-density mix of hot lava blocks, ash and gas that propels pyroclastic debris and moves down hills.
Types of Volcanoes
- Shield Volcanoes: Built out of layers of lava from continual eruptions.
- Lava is fluid, spreading over a wide area
- Have gently sloping sides.
- Example is Mauna Kea, Hawaii (tallest mountain on Earth when measured from its base on the ocean floor).
- Stratovolcanoes (Composite Volcanoes): Tall, conical volcanoes
- Built up of many layers of hardened lava, tephra, pumice, and ash
- Have steep profiles.
- Have periodic eruptions.
- Lava is sticky/ high viscosity.
- Caldera Volcanoes: Formed when a huge stratovolcano blows its top off
- The magma chamber empties and the ground sinks.
- Example is Krakatoa.
Volcano Preparedness
- Alert Levels: A system used in the Philippines (with variations) to indicate the level of volcanic unrest and impending eruption.
- Level 0: No alert.
- Level 1: Abnormal (low level unrest).
- Level 2: Increasing unrest (moderate unrest).
- Level 3: Increasing tendency towards eruption.
- Level 4: Hazardous eruption imminent (intense unrest).
- Level 5: Hazardous eruption (ongoing).
- Permanent Danger Zone (PDZ): Delineated and identified where no permanent habitation is recommended due to possible impact of hazards at any time.
- Hazard Maps: Illustrate potential impacts—lava flows, pyroclastic flows, ash fall, volcanic gases, and lahars in valleys that drain the volcano.
- Help understand affected areas/ safe areas.
- Before, During, and After: Actions to take before, during, and after a volcanic eruption.
- Before: Consult hazard maps, be aware of hazards, and have a family emergency plan.
- During: Stay inside, listen to radio, do not drive through ash, and do not try to clean ash.
- After: Listen to updates, thoroughly cook food if necessary and go home only when local authorities say it is safe.
- Cleaning Up Ashfall: Wear a mask, lightly damp the ash for cleaning, and do not dump ash into sewage systems.
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