Volcanic eruption
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During a volcanic eruption, lava, ash, volcanic bombs and blocks, and gases are expelled from the volcanic vent. There are several types of eruptions defined by volcanologists, often named after volcanoes that exhibited that type. On August 26th, 1883, Krakatoa erupted catastrophically. An ash plume rose 80km into the sky and the loud bang was heard over 5,000km away. Two-thirds of the island was destroyed and 36,000 people were killed by pyroclastic flows and tsunamis up to 40m high. Volcanic eruptions can cause landslides and mudslides from instability in surrounding land and heavy rainfall on steep terrain. Wildfires are also
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GeohazardsJevish Sydamah
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Geohazards are natural hazards caused by geological processes of the Earth, such as earthquakes, volcanoes, floods, landslides, and tsunamis. These events can cause significant loss of life and property damage when they occur. Some geohazards like volcanoes and cyclones may be predicted by monitoring warning signs like changes in gases, small earthquakes, and swelling of the volcano. Major earthquakes typically occur along fault lines and are followed by aftershocks. Volcanic eruptions pose hazards from pyroclastic flows, lahars, and tsunamis they can trigger. Landslides involve the breakdown and downhill movement of rock and debris. Tsunamis are gravity wavesNatural disasters
Natural disastersKella Randolph
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Natural disasters such as volcanoes, earthquakes, and tsunamis are sudden events caused by natural geological processes. Volcanoes occur at boundaries where tectonic plates meet and result in eruptions of lava, ash, and gases. Earthquakes are caused by the sudden release of built-up energy in the Earth's crust along fault lines, resulting in seismic waves. Tsunamis are a series of powerful ocean waves caused by earthquakes, landslides, or volcanic eruptions that can flood coastal areas and cause widespread damage.Volcanic Hazards.pptx
Volcanic Hazards.pptxMariaCieloMantilloLu
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A volcano is a mountain that erupts materials from the earth's crust through an opening. Volcanic hazards endanger human life and infrastructure from eruptions. Hazards include tephra, ash fall, pyroclastic flows, surges, gases, lava flows, and debris avalanches. Pyroclastic surges are low density flows containing gases. Lava flows are streams of molten rock from an erupting vent.roshan adhitya 4
roshan adhitya 4roshan2001
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This document defines and provides examples of different types of natural phenomena including:
- Geological phenomena such as mineralogic and lithologic phenomena that are explained by geology.
- Meteorological phenomena such as weather events involving temperature, pressure, and moisture that are studied at various scales.
- Oceanographic phenomena under the sea including tsunamis and ocean currents.
- Specific atmospheric optical phenomena like lenticular clouds and circumhorizontal arcs formed by ice crystals in cirrus clouds.Presentation4 by Roshan Adhithya
Presentation4 by Roshan Adhithyaroshan2001
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This document defines and provides examples of different types of natural phenomena including:
- Geological phenomena such as mineralogic and lithologic phenomena that are explained by geology.
- Meteorological phenomena such as weather events involving temperature, pressure, and moisture that are studied at various scales.
- Oceanographic phenomena under the sea like tsunamis and ocean currents.
- Specific atmospheric optical phenomena like lenticular clouds and circumhorizontal arcs formed by ice crystals in cirrus clouds.Disaster management
Disaster managementchrist samuel
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This document discusses different types of natural disasters such as floods, tsunamis, earthquakes, volcanic eruptions, and thunderstorms. It provides definitions and examples of each type of disaster. Earthquakes are described as causing shaking and ground displacement due to slippage within geological faults. Tsunamis are defined as a series of waves caused by displacement of water, often due to earthquakes or volcanic eruptions, which can have waves up to 30 meters high. Flooding is defined as an overflow of water that submerges normally dry land.liezethjoygelviepolinareportingilipino.pptx
liezethjoygelviepolinareportingilipino.pptxromeotamor7
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This document describes various geologic hazards such as earthquakes, volcanic eruptions, and landslides. It defines key terms and processes associated with these hazards, such as tephra, pyroclastic flows, lahars, liquefaction, and ground shaking. It also notes that the Philippines is highly susceptible to natural disasters due to its location along the Ring of Fire, and experiences many deadly typhoons, earthquakes, and volcanic eruptions that negatively impact people and the environment.liezethjoygelviepolinareportingilipino.pptx
liezethjoygelviepolinareportingilipino.pptxromeotamor7
Ìý
This document describes various geologic hazards such as earthquakes, volcanic eruptions, and landslides. It defines key terms and processes associated with these hazards, such as tephra, pyroclastic flows, lahars, liquefaction, and ground shaking. It also notes that the Philippines is highly susceptible to natural disasters due to its location along the Ring of Fire, and experiences many deadly typhoons, earthquakes, and volcanic eruptions that negatively impact people and the environment.Natural calamities
Natural calamitiesraghav4638
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The document discusses different types of natural disasters:
1) Natural disasters include geologic events like earthquakes, volcanic eruptions, floods, and tsunamis that can cause loss of life and property damage.
2) Earthquakes and volcanic eruptions are specifically examined, with earthquakes measured by magnitude and volcanoes causing destruction through eruption, lava, ash, and mudflows.
3) Other natural disasters mentioned include blizzards, cyclonic storms like hurricanes, droughts, heat waves, tornadoes, which can all have severe impacts on populations and economies depending on their strength and location.Report by wina mustika xi ipa8
Report by wina mustika xi ipa8sman 2 mataram
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Volcanic eruption occurs when magma inside the earth is pushed out by high pressure gas. Liquid magma that emerges from the earth is called lava, which can reach temperatures of 700-1200°C. During an eruption, rock and ash can be sprayed up to 18 km away, while lava can flow up to 90 km from the volcano. Signs of an impending eruption include increased temperatures around the mountain, drying springs, thundering noises and vibrations, and migrating wildlife. Eruptions release volcanic gases and eject lava, ash, rocks, and heat clouds that can harm humans.Volcanic eruption
- 1. VOLCANIC ERUPTION During a volcanic eruption, lava, (ash, volcanic bombs and blocks), and various gases are expelled from a volcanic vent or fissure. Several types of volcanic eruptions have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has been observed. Some volcanoes may exhibit only one characteristic type of eruption during a period of activity, while others may display an entire sequence of types all in one eruptive series. A volcanic eruption is the point in which a volcano is active and releases lava and poisonous gasses in to the air. They range from daily small eruptions to extremely infrequent supervolcano eruptions (where the volcano expels at least 1,000 cubic kilometers of material.) Some eruptions form pyroclastic flows, which are high-temperature clouds of ash and steam that can travel down mountainsides at speeds exceeding that of an airliner. Worst volcanic eruption: 1883 Krakatoa eruption, Indonesia The force of the explosive eruption of Krakatoa was 10,000 times greater than the hydrogen bomb that was dropped on the city of Hiroshima. In fact the percussive force of the blast was so great that it is said to have travelled back and forth around the world seven times. Though the volcano on the Indonesian island of Krakatoa had been already erupting for several months, it came to its dramatic denouement early in the morning on 26 August 1883. At the point of the eruption a plume of ash was blasted 80km into the atmosphere and the bang was so loud that it was heard more than 3000km away in Perth and more than 5000km in the opposite direction on the Indian Ocean island of Rodrigues. Two thirds of the island was destroyed. 36,000 people were killed by superheated flows of gas and ash that swept across neighbouring islands and also by a series of devastating tsunamis up to 40m high. A landslide is a disaster involving elements of the ground, including rocks, trees, parts of houses, and anything else which may happen to be swept up. Landslides can be caused by an earthquake, volcanic eruptions, or general instability in the surrounding land. Mudslides or mudflows, are a special case of landslides, in which heavy rainfall causes loose soil on steep terrain to collapse and slide downwards. Wildfires, or forest fires, are uncontrolled fires burning in wildland areas. Common causes include lightning, human carelessness, arson, volcano eruption, and pyroclastic cloud from active volcano. The can be a threat to those in rural areas and also to wildlife. Wildfires can also produce ember attacks, where floating embers set fire to buildings at a distance from the fire itself.