This document provides an overview of natural disasters including earthquakes, tsunamis, volcanic eruptions, and tornadoes. It discusses what causes these events, how destructive they can be including historical examples, and what warning systems and precautions exist in hazard-prone areas. Credible online sources were selected using criteria including accuracy, authority, objectivity, currency, and coverage of information.
Disaster is a serious, dangerous and intolerable phenomena on the planet earth. Thousands of people die in a moment. Many people may become homeless and parentless. Valuable properties get damaged within no time. Disasters are events shocking the whole world and making the humanity to feel very sad. All life support systems are affected by these incidences.
What is required to minimize the effects is the application of certain management practices. Disaster management is an essential component of our development works. Let us see the aspects of Disaster Management in this module.
Disaster is a serious, dangerous and intolerable phenomena on the planet earth. Thousands of people die in a moment. Many people may become homeless and parentless. Valuable properties get damaged within no time. Disasters are events shocking the whole world and making the humanity to feel very sad. All life support systems are affected by these incidences.
What is required to minimize the effects is the application of certain management practices. Disaster management is an essential component of our development works. Let us see the aspects of Disaster Management in this module.
A disaster is a serious disruption, occurring over a relatively short time, of the functioning of a community or a society involving widespread human, material, economic or environmental loss and impacts, which exceeds the ability of the affected community or society to cope using its own resources.
Tornado Presentation , Formation of tornado , Causes , Types , Mitigation of ...Chandan Pradhan
Tornado is a violently rotating columns of air that extent form thunderstorm to the ground.
It is also called twister .
it can take various shape with the wind direction.
Tsunami is a Japanese word Tsu means ‘harbour’ and nami means ‘wave’.
They are called tidal waves but they have actually nothing to do with the tides. However their appearance from shore is similar to rapidly rising or falling tides.
Tsunami is a series of wave created when water is moved very quickly.
Tsunami is gravity wave system, triggered by vertical disturbances in ocean. They are long waves sometime with hundreds of miles b/w their crests, just like the concentric waves generated by an object dropped into a pool.
First tsunami was recorded in 1480 B.C. in eastern Mediterranean, when the Minoan civilization was wiped out.
A large tsunami accompanied by the earthquake of Lisbon in 1755.
The Kutch earthquake of June 16, 1819 generated strong tsunami which submerged the coastal areas and damage to ships and country made boats of fishermen.
North and South American records have dated such
events back to 1788 for Alaska and 1562 for Chile. Records of Hawaiian tsunami go back to 1821.
Tsunami hits the Mona Passage off Puerto Rico in 1918, grand banks of Canada in 1929.
Disaster
“A disaster can be defined as any occurrence that causes damage, ecological disruption, loss of human life, deterioration of health and health services on a scale, sufficient to warrant an extraordinary response from outside the affected community or area”.
(W.H.O.)
Disaster management
Disaster management can be defined as the effective organization, direction, and utilization of available counter-disaster resource.
B T Basavanthappa
Aim
• To provide prompt and effective medical care to the maximum possible in order to minimize morbidity and mortality.
Objectives
• To optimally prepare the staff and institutional resources for effective performance in disaster situation
• To make the community aware of the sequential steps that should be taken at individual and organization levels.
A disaster is a serious disruption, occurring over a relatively short time, of the functioning of a community or a society involving widespread human, material, economic or environmental loss and impacts, which exceeds the ability of the affected community or society to cope using its own resources.
Tornado Presentation , Formation of tornado , Causes , Types , Mitigation of ...Chandan Pradhan
Tornado is a violently rotating columns of air that extent form thunderstorm to the ground.
It is also called twister .
it can take various shape with the wind direction.
Tsunami is a Japanese word Tsu means ‘harbour’ and nami means ‘wave’.
They are called tidal waves but they have actually nothing to do with the tides. However their appearance from shore is similar to rapidly rising or falling tides.
Tsunami is a series of wave created when water is moved very quickly.
Tsunami is gravity wave system, triggered by vertical disturbances in ocean. They are long waves sometime with hundreds of miles b/w their crests, just like the concentric waves generated by an object dropped into a pool.
First tsunami was recorded in 1480 B.C. in eastern Mediterranean, when the Minoan civilization was wiped out.
A large tsunami accompanied by the earthquake of Lisbon in 1755.
The Kutch earthquake of June 16, 1819 generated strong tsunami which submerged the coastal areas and damage to ships and country made boats of fishermen.
North and South American records have dated such
events back to 1788 for Alaska and 1562 for Chile. Records of Hawaiian tsunami go back to 1821.
Tsunami hits the Mona Passage off Puerto Rico in 1918, grand banks of Canada in 1929.
Disaster
“A disaster can be defined as any occurrence that causes damage, ecological disruption, loss of human life, deterioration of health and health services on a scale, sufficient to warrant an extraordinary response from outside the affected community or area”.
(W.H.O.)
Disaster management
Disaster management can be defined as the effective organization, direction, and utilization of available counter-disaster resource.
B T Basavanthappa
Aim
• To provide prompt and effective medical care to the maximum possible in order to minimize morbidity and mortality.
Objectives
• To optimally prepare the staff and institutional resources for effective performance in disaster situation
• To make the community aware of the sequential steps that should be taken at individual and organization levels.
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1. Natural Disasters
M. Borowik
N. Murray
K. Nabbs
A. Pakebusch
An Overview of Natural Disasters; Tornadoes,
Earthquakes, Volcanoes, and Tsunamis
2. Informational Resources and their
Credibility
This presentation contains information from online resources that were selected using Metzger
(2007) recommended assessment of credibility criteria for online information. In particular,
resources were chosen based on;
Accuracy – the degree to which online sources are free from error, and can be
verified offline.
Authority – qualifications and affiliations of the author or organisation,
as well as availability of contact information.
Objectivity – the underlying purpose of the source (i.e commercial intent), transparency, and
whether source information is considered to be fact or opinion.
Currency – whether provided information is up to date.
Coverage – refers to quality and depth of information provided by the source.
Consequently, credible online resources derive fact from carefully deducted theory, provide
highly accurate data, and offer objective evidence (with no commercial intent) to support their
conclusions (Metzger, 2007).
3. What are Natural Disasters?
Natural disasters are
serious disruptions to
regions or
communities by a
naturally occurring,
rapid phenomena that
causes injury, death,
or damage to property
or the environment.
Natural disasters
require substantial co-
ordinated involvement
of Government
organisations and
community groups.
Australia.gov.au (2015).
4. Tornadoes
Earthquakes
Volcanic Eruptions
Tsunamis
Bushfires
Hurricanes
Cyclones
Floods
Avalanches
Blizzards
Storms
Other
• Tornadoes, Earthquakes, Volcanic Eruptions,
and Tsunamis.
There are many types of
natural disasters, these are
just some examples. However,
this presentation will focus on;
What Types of Natural Disasters Exist?
5. What is an Earthquake?
Geoscience Australia, a prescribed Government agency, defines earthquakes
as violent shaking (called seismic waves) of the ground resulting from tectonic
plate movement (sublayers of the earths crust).
What Causes Earthquakes?
Earthquakes are caused by a sudden release
of energy (due to compression in
the earths crust) along fault planes
(weak points in tectonic plates).
(Geoscience Australia, 2014).
What is an Earthquake?
6. Destruction and Historical Events
The most destructive earthquake in history
occurred near Shaanxi, China in 1556.
Earthquake damage was reported to have
extended across 270 km from the
epicentre (centre of the earthquake).
Based on these reports, the earthquake was estimated
to have measured an 8 on the Richter magnitude scale
(10 being the highest score).
More than 830,000 soldiers and citizens were reported to have died as a
result.
(United States Geological Survey, 2014)
How Destructive are Earthquakes?
7. What Warning Systems Exist for
Earthquakes?
Warning Systems
Early Earthquake Warning (EEW) systems utilise
ground motion sensors to detect early vibrations
generated by earthquakes.
ShakeAlert (an EEW system) works by detecting
initial earthquake waves (which travel fastest)
giving people a few seconds to minutes to take
precautionary actions before the arrival of the
slower but stronger earthquake waves.
Members of the public can program their computers and mobile phones to
receive alert messages from EEW systems.
(Burkett, Douglas, Given, & Jones, 2014)
8. What Precautions are put in place for
Earthquake Hazard Areas?
Precautions
People are advised to prepare a basic emergency kit (water, food, first aid,
etc.), and a family emergency plan (families should discuss how they will
contact each other in case of an emergency, and what to do when alerted of
an earthquake).
All book cases, filing cabinets, picture frames, and light fixtures should be
safely anchored to walls.
Members of the public, and business owners are recommended to hold regular
emergency evacuation
drills.
(The Ready Campaign, 2014)
9. What is a Tsunami?
What is a Tsunami?
Tsunami is derived from the Japanese
words ‘tsu’ meaning harbor, and ‘nami’
meaning wave.
A tsunami is a large wave resulting from an
earthquake, landslide or volcanic eruption
in or adjacent to an ocean.
The result is fast-moving, destructive wave
that often causes inland flooding.
Ga.gov.au (2015)
Source: Thirty-Six Views of Fuji (1831)
10. What Causes Tsunamis?
What Causes Tsunamis?
Earthquakes are the most common cause of tsunamis
Underwater seismic vibrations often produce fast
moving waves that flood neighboring coasts.
Landslides
Land slumps that hit the ocean can result in an
underwater landslide, and in turn, a tsunami.
Volcanic Eruptions
Tsunamis caused by volcanic eruptions are least
common
A volcanic eruption near a large body of water can
sometimes result in a quick ground uplift, followed by a
quick drop, and a subsequent tsunami wave.
(Geoscience Australia, 2014).
Source: Geoscience Australia
11. How Destructive are Tsunamis?
Destruction and Historical Events
The most destructive tsunami in history
occurred in Sumatra, Indonesia in 2004.
The tsunami was the result of a 9.1
magnitude earthquake (pictured).
The tsunami wave reached a height of 50
meters, and flooded 5km of land.
The Sumatran tsunami was also reported
to have significantly increased wave height
across the US, UK and Antarctica.
230,000 people were reported dead, and
the tsunami was estimated to have cost US
$10 billion worth of damages (Phillips, C
2011) Sumatra tsunami, source Guy Gelfenbaum, USGS
12. Historical Tsunamis
The most recent and second most powerful tsunami
occurred in Japan, in 2011.
More than 18,000 people were killed as 10m high waves
swept over Japan at 800km per hour (Phillips, C 2011)
Result of a 9.0 magnitude earthquake.
Destroyed approximately 452,000 peoples homes.
Unique to this tsunami, a nuclear emergency resulted due
to subsequent damage to the Fukushima Daiichi nuclear
power plant.
It is estimated it will take Japan 5 years to financially
overcome the $235 billion in damages
(Phillips, C 2011)
13. What Warning Systems Exist for
Tsunamis?
Warning Systems
Unpredictability, infrequency and unique causes
have made forecasting tsunamis very difficult
International Tsunami Warning System
Monitors ocean waves after any Pacific earthquake
with magnitude over 6.5
If necessary, warnings are then issued to local
authorities to evacuate low-lying areas
National Oceanic and Atmospheric Administration
(NOAA) operates 2 centers
West Coast/Alaska Tsunami Warning Center
Pacific Tsunami Warning Center
Source: Hydro International
14. What Precautions are put in place for
Tsunami Hazard Areas?
Precautions
A number of precautionary measures are in
place for communities in tsunami hazard
areas, including;
Evacuation orders based on the height of your
street above sea level and distance from the
coast.
Evacuation zones ideally within 15 minutes walk
that are located at least 30 m above sea level
and 3 km inland.
Regular practice taking evacuation routes,
especially in low-level light.
Familiarising tourists with evacuation protocols
Source: jaxshells.org
15. What is a Volcanic Eruption?
A volcanic eruption occurs when a there is a
sudden, and violent release of volcanic
material (gas, ash, molten rock) from
underneath the earth.
Volcanic lava can reach temperatures of 700
to 1,200 Celsius.
The most commonly recognised volcano eruption (the volcanic eruption cone)
occurs as a result of tectonic plate movements. Over the course of many
years, volcanic material begins to harden around the volcano vent, giving it a
mountain like appearance.
Not all volcanoes erupt above sea level, there are a significant number of
volcanoes that erupt underneath oceans.
(Bom.gov.au, 2015)
16. What Causes Volcanic Eruptions?
Earths crust is comprised of 17 tectonic plates that continually move on top of
earths mantle (a layer between the crust and the outer core). Volcanic
eruptions occur when these tectonic plates diverge movement of these
tectonic plates. Volcanoes also form when there is stretching and thinning of
the earth’s crusts.
Volcanic eruptions occur when gas trapped
beneath these tectonic plates violently
extrudes onto earths crust along with molten
rock from within earths mantle.
The strength of volcanic eruptions depends
on gas pressure, and the ease with which
lava is able to flow.
(Ga.gov.au, 2015)
17. How Destructive are Volcanic
Eruptions?
The 2010 eruption of the Icelandic volcano,
Eyjafjallajokull substantially disrupted Europe's
political and cultural activities.
Over 95,000 flights were cancelled due to the
extensive spread of volcanic ash across Europe.
An estimated U.S $1.7 billion was lost by the
airline industry as a direct result of the eruption.
The volcanic ash cloud was 6-10 km in height and lasted approximately 6 days.
As the volcanic eruption was well predicted, there were no human fatalities.
(Volcanoes.usgs.gov, 2015)
18. What Warning Systems Exist for
Volcanic Eruptions?
Volcanic eruptions can be predicted by monitoring of seismic activity (i.e
minor earthquakes occur prior to an eruption).
Increasing levels of sulphur dioxide, and decreasing pressure of magma as it
nears the surface (enabling carbon dioxide to escape) signals an oncoming
eruption.
Geologists measure the tilt of the
volcano slope. An increased rate of
swelling indicates accumulation
of magma, and in turn, an eruption.
(Volcanoes.usgs.gov, 2015)
19. What Precautions are put in place for
Volcano Eruption Hazard Areas?
Governments outline clear evacuation and
medical plans for members of the public, and
affected industries.
News broadcasters regularly report updates
received from volcanic monitoring centres.
During an eruption, public members are advised
to stay clear of river areas and low-lying regions.
Individuals are advised to prepare an emergency
kit, as well as to wear long-sleeved shirts, long
pants, and use goggles or eyeglasses during
evacuation.
(Society, 2015)
20. What is a Tornado?
What is a Tornado?
Tornadoes is from the Spanish word, tronada, meaning
thunderstorm
A Tornado is as a rotating, funnel-shaped cloud that
extends from a thunderstorm to the ground with whirling
winds that can reach 300 mph.
Waterspouts are tornadoes that form over a body of
water
Thunderstorms most likely to give birth to Tornadoes are
called supercells
Usually a tornado starts off as a white or grey cloud but
if it stays around for a while, the dirt and debris it sucks
up give it a dark appearance. Source: markdmckinney.com
21. What Causes Tornadoes?
What Causes a Tornado?
A Tornado normally begins with two winds coming
together at very high speeds. Upward and downward
winds traveling at different levels of the atmosphere
result in an updraft and give the tornado's its funnel-
like appearance.
Tornadoes form in unusually violent thunderstorms
when there is sufficient wind instability in the lower
atmosphere.
(Tornado-facts.com, 2015)
Source: Tornado Facts – Gallery of Tornado Pictures
22. How Destructive are Tornadoes?
Rank Date Estimated Intensity* State Injuries (Deaths) Remarks
1 March 18, 1925 EF-5 MO, IL, IN 2,027 (695)
Tri-State Tornado
Wikipedia Entry (link is external)
Tornado Project Page (link is external)
2 May 6, 1840 Unknown LA, MS 109 (317)
Hit Nachez, MS
Wikipedia Information (link is external)
Tornado Project Page (link is external)
3 May 27, 1896 EF-4 MO, IL 1,000 (255)
The Great St. Louis Tornado
Tornado Project Page (link is external)
The Great Cyclone. SIU Press (link is external)
St. Louis American Local History Network (link is
external)
4 April 5, 1936 EF-5 MS 700 (216)
Hit Tupelo, MS
Tornado Project Page (link is external)
5 April 6, 1936 EF-4 GA 1,600 (203)
Hit Gainesville, GA
Tornado Project Page (link is external)
About N. Georgia (link is external)
6 April 9, 1947 EF-5 TX, KS, OK 970 (181) Tornado Project Page (link is external)
7 May 22, 2011 EF-5 MO 1,000 (158)
Hit Joplin, MO
NWS Summary
8 April 24, 1908 EF-4 LA, MS 770 (143)
Hit Amite, LA and Purvis, MS
Tornado Project Page (link is external)
9 June 12, 1899 EF-5 WI 200 (117)
Hit New Richmond, WI
Tornado Project Page (link is external)
10 June 8, 1953 EF-5 MI 844 (116)
Hit Flint, MI
Tornado Project Page
(Dosomething.org, 2015)
23. What Warning Systems Exist for
Tornadoes?
The most common form of Tornado warning is a siren that
will sound when there is a imminent threat of a tornado.
The Tornado warning is generally issued when the
meteorological radar indicates the formation of a tornado,
however this is not always the case. The warning can also
be issued if a funnel cloud is spotted by;
A member of the public
Storm chasers
Emergency management
Law enforcement
When these sirens are sounded, residents are advised to
take immediate safety precautions (i.e seek underground
shelter).
(Markdmckinney.com, 2015)
24. What Precautions are put in place for
Tornado Hazard Areas?
Source: ravingreader.wordpress.com
Tornado Alley is a nickname given to an area in the
southern plains of the central United States. The area is
known for experiencing a high frequency of tornadoes.
Tornadoes in this region typically occur in late spring and
early fall.
Residents are well informed in taking emergency
precautions when alerted of a tornado (i.e stay inside
away from windows, keep low to the ground, etc.)
Some residents have their own purpose built tornado
shelters
Residents are advised to wait for emergency services
if impacted by a tornado
(Tornado-facts.com, 2015)
25. References
Australia.gov.au,. (2015). natural-disasters | australia.gov.au. Retrieved 21 January 2015, from http://www.australia.gov.au/about-australia/australian-story/natural-disasters
Australiangeographic.com.au,. (2015). The 10 most destructive tsunamis in history. Retrieved 21 January 2015, from http://www.australiangeographic.com.au/topics/science-
environment/2011/03/the-10-most-destructive-tsunamis-in-history/
Bom.gov.au,. (2015). BoM-Darwin Volcanic Ash Advisory Centre. Retrieved 21 January 2015, from http://www.bom.gov.au/info/vaac/
Dosomething.org,. (2015). 11 Facts About Tornadoes | DoSomething.org | America's largest organization for youth volunteering opportunities, with 2,700,000 members and
counting. Retrieved 21 January 2015, from https://www.dosomething.org/facts/11-facts-about-tornadoes
Earthquake.usgs.gov,. (2015). Earthquakes with 50,000 or More Deaths. Retrieved 21 January 2015, from http://earthquake.usgs.gov/earthquakes/world/most_destructive.php
Ga.gov.au,. (2015). About Us - Geoscience Australia. Retrieved 21 January 2015, from http://www.ga.gov.au/about
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