Environmental Hazards
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Transcript of Environmental Hazards
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Environmental Hazards
Presented By Ahmad HassanUniversity Of Engineering and Technology Lahore
(FSD Campus) 2014-BT-TXT-03
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Contents Introduction of environmental hazardTypes of environment hazardEarthquakeTypes of earthquake weavesVolcano CausesEffects
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Introduction of environmental hazardEnvironmental hazards is the state of events
which greatly effects the surrounding and people’s health.
This situation cause pollution and natural such as storm, earthquake and volcano.
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What is Earthquake?A sudden movement of the earth's crust caused
by the release of stress collected along faults or by volcanic activity
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How Earthquake Happens? It caused by a sudden slip on a FAULT.
Stresses in the earth's outer layer push sides of fault together.
Stress builds up & rocks slips suddenly, releasing energy in waves that travel through the earth's CRUST & cause the shaking that we Feel during an earthquake.
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Fault- earthquake A fault is a fracture along which the blocks of outermost
major layer of the earth, on either side have moved relative to one another parallel to the fracture. Faults are classified to Strike-slip and Dip-slip faults (normal, reverse and thrust).
What is the crust?The outermost major layer of the earth is called CRUST and
ranging from about 10 to 65 km in thickness worldwide. The uppermost 25 km of crust is brittle enough to produce earthquakes.
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Earthquake.
VIDEO.mp4
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Epicenter and Focus
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Types of Earthquake WavesBody Waves
P-Waves (primary waves)S-Waves (secondary waves)
Surface Waves L – Love Waves R – Raleigh Waves
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Body Waves: P and S waves Body waves
P or primary waves fastest waves travel through solids,
liquids, or gases compression wave,
material movement in the same direction as wave movement
S or secondary waves slower than P waves travel through solids
only shear waves - move
material perpendicular to wave movement
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Surface Waves: R and L waves Surface Waves
Travel just length of the ground’s surface Slower than body waves; rolling and side-to-side movement Especially damaging to buildings
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TsunamiTsunami is a series waves caused by
earthquakes or volcanic eruptions under the sea. Out in the depths of the ocean, tsunami waves do
not dramatically increase in height. But as the waves travel inland, they build up to higher and higher heights as the depth of the ocean decreases. The speed of tsunami waves depends on ocean depth rather than the distance from the source of the wave. Tsunami waves may travel as fast as jet planes over deep waters, only slowing down when reaching shallow water
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Tsunami .
VIDEO.mp4
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How Measure The Earthquake Strength?1. Magnitude & 2. Intensity1. Magnitude:
A measure of actual physical energy release at its source as estimated from instrumental observations.
2. Intensity:
A measure of the felt effects of an earthquake rather than the strength of the earthquake itself.
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Effects Fires Building collapse
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EffectsRupture Liquification
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Volcanoes A volcano is a vent that
connects molten rock
(magma) from in the
Earth’s crust to the Earth's
surface.
The volcano includes the
surrounding cone of
erupted material
Vent
MagmaChamber
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How and why do volcanoes erupt?Hot, molten rock (magma) is floating and will rise up through
the crust to erupt on the surface.When magma reaches the surface it depends on how easily
it flows and the amount of gas (H2, CO2, SO2) it has in it as to how it erupts.
Large amounts of gas and a high viscosity (sticky) magma will form an explosive eruption!
Small amounts of gas and low viscosity magma will form an effusive eruption
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Effusive Eruptions
Effusive eruptions are characterized by outpourings of lava on to the ground.
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Volcano .
VIDEO (2).mp4
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Volcano MonitoringSeismicityDeformationGas Output
Remote sensing techniquesThese three things are
the most important sign to an eruption.
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What is volcano monitoring?As magma moves through the Earth’s crust it can alter it’s
environment producing sign’s on the surface, these signs are called “precursors” to an eruption.
Precursors include• Increased earthquakes in the area means increased
seismicity• Swelling and cracking of the ground means deformation• Change in the amount of chemistry of the gas coming out
of the volcano• Change in the groundwater levels and chemistry.
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Volcano FlowHowever, the potential damage was reduced by
spraying seawater onto the advancing volcano flows. This caused them to slow and stop away from the
undamaged part of the town.
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Volcano FlowIt is not just explosive volcanic activity that
can be hazardous. Effusive activity is also dangerous.
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Thank you