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‘Shaking Earth’

‘Shaking Earth’. Presented by Students of Class X. Goal of our Project. Analyze why and how earthquakes are caused. Provide guidelines for Earthquake Planning and Recovery Provide recommendations that can mitigate the losses due to earthquake

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‘Shaking Earth’

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  1. ‘Shaking Earth’ Presented by Students of Class X

  2. Goal of our Project • Analyze why and how earthquakes are caused. • Provide guidelines for Earthquake Planning and Recovery • Provide recommendations that can mitigate the losses due to earthquake • Create awareness in the school and nearby community

  3. Natural Disasters How vulnerable is India? Our country is very vulnerable to natural disasters. • Earthquake: 54% of the landmass prone to earthquake. • Flood: 40 million hectares of landmass prone to floods. • Cyclone: 8000 Km long coastline with two cyclone seasons. • Drought: low and medium rainfall regions which constitute 68% of the total areas, are vulnerable to periodical drought. • India is also vulnerable to other natural calamities like avalanches/landslides etc.

  4. What made us take up the project – ‘Shaking Earth’ The Bhuj earthquake that shook the Indian Province of Gujarat on the morning of January 26, 2001 is one of the two most deadly earthquakes to strike India in its recorded history.

  5. Aftermath of the Bhuj Earthquake Government of India figures: Death toll: 19,727 • Injured: 1,66,000 • Homeless: 6,00,000 • Houses destroyed: 3,48,000 • Houses damaged: 8,44,000 The State Department estimates that the earthquake affected, directly or indirectly, 15.9 million people out of a total population of 37.8 million. More than 20,000 cattle were reported killed. Government estimates place direct economic losses at $1.3 billion. Other estimates indicate losses may be as high as $5 billion.

  6. Understanding Earthquakes COLD!!! Why does the crust move? The earth is divided into three main layers – a hard outer crust, a soft middle crust, and a center core. The outer crust is broken into massive irregular pieces called “plates”. These plates move very slowly, driven by energy forces deep within the earth. VERY HOT!!!

  7. Tectonic Plates - “Pieces of the Crust” Eurasia Plate America Plate Pacific Plate Africa Plate Australia Plate Antarctic Plate Earthquake Locations 6 Continental Plates (14 sub-continental plates) Earthquakes occur when these moving plates grind and scrape against each other. When the accumulated energy grows strong enough, the plates break free causing the ground to shake.

  8. Seismic Waves The rupture of fault results in sudden release of the strain energy that has been built up over the years. The most important form which this suddenly released energy takes is that of seismic waves which is of 3 types. • 1. P (primary) waves move the fastest • 2. S (shear) waves move more slowly, shake up and down • 3. L or Surface Waves travel slowly and are the most dangerous

  9. Major Earthquakes world wide

  10. Effects of Earthquakes • Ground Shaking • Liquefaction • Dam Breaks • Landslides • Tsunami • Flash floods • Disruption of gas, electric, and phone services • Fire

  11. What determines the amount of damage in an Earthquake? • Magnitude and Duration of the earthquake • Underlying Geology • Building Construction

  12. How can we prepare for Earthquakes? • Understand what happened in the past • Understand how materials and structures respond • Understand how rescue agencies respond • Understand the awareness level of the community

  13. Role Play Basic facts as contributed by each member of the team: • Survey Specialist • Construction Engineer • Geologist • Social worker We decided to focus on the three metros – Delhi, Mumbai and Bangalore. Collected information through E- Mails, Blogs and Field Visit.

  14. Metros at a glance • Mumbai - Seismic zone III Presence of major fault lines Unsafe Buildings • Bangalore – Seismic Zone II Sudden spurt of buildings Foundation on Lake beds • Delhi – Seismic Zone IV Non-engineered structures Unauthorized colonies Liquefaction susceptible

  15. Observation – Survey Specialists • Majority of the population in three metros are aware of the aftermath of Earthquakes • Few know about Building Bye-Laws and Regulations laid down by the government • Most do not know whether the building they reside are Earthquake Resistant or not • Many are not aware about insurance against Natural Disasters • Vague information about the do’s and don'ts in case of an earthquake

  16. Awareness on various categories Sample Population - 1500

  17. Observation - Engineering a Model Our task was to design an earthquake resistant building given the following criteria: 1. High Impact 2. Hill side home 3. Unstable terrain 1. We found that a relatively short, wide building can withstand a great impact when compared to a tall, narrow building. 2. A deep foundation with a large surface area can support a house on a hill. 3. A building on an uneven terrain can be stabilized by focusing most of its mass near the bottom. A pyramid shaped building proves to be the best bet.

  18. Building Considerations - Tips that might help b. a. c. Size of the Buildings a) In tall buildings the horizontal movement of the floors during ground shaking is large. b) In short but very long buildings, the damaging effects are many. c) In buildings with large plan area, the horizontal seismic forces can be excessive to be carried by columns and walls.

  19. Building Considerations - Tips that might help HORIZONTALLAYOUT OF BUILDINGS Building Plans with simple geometry perform well during strong earthquakes. Buildings with re-entrant corners, like U, V, H and + shaped in plan sustain significant damage. Such buildings can be made into two parts by using a separation joint at the junction.

  20. Building Considerations Tips that might help ADJACENCY OF BUILDINGS When two buildings are close to each other, they may pound on each other during strong shaking. When building heights do not match the roof of the shorter building may pound at the mid- height of the column of the taller one and this can prove to be very dangerous

  21. Earthquake Resistant Buildings • Retrofitting • Shock absorbers (viscous dampers) can be added to absorb seismic energy • Use bearings or isolators to reduce shocks

  22. Underlying Geology Liquefaction occurring beneath buildings and other structures can cause major damage during earthquakes. Liquefaction takes place when loosely packed, water-logged sediments at or near the ground surface lose their strength in response to strong ground shaking. When the soil is not homogeneous, then there is differential settlement, with some part of the structure sinking more than other. This induces excessive stress and causes cracking. 

  23. Observations - Geological Considerations Buildings can be constructed on firm and soft soils but it will be dangerous to build them on weak soils. Hence appropriate soil investigations should be carried out to establish the allowable bearing capacity and nature of soil. Type of soil present in most parts of the cities – Delhi – Weak Soil Mumbai – Alluvial sandy soil (soft soil) Bangalore - Loamy and clayey soil

  24. Observation – Social Worker Relief Mechanism • States primarily responsible for handling disasters. • Central Government provides assistance as and when necessary. • A Calamity Relief Fund is constituted at State level to which the Government of India contributes 75%. This is used for provision of immediate relief and restoration of essential infrastructure. Police control rooms, Fire stations, Home Guard organization, Govt hospitals, Ambulance services are the local agencies that come to immediate rescue in case of an earthquake.

  25. Prevailing Conditions • Inadequate • man power • trained personnel • basic Infrastructure • funds • Outdated Equipments & Communication systems • Lack of definite guidelines • Misuse & mismanagement of resources

  26. Recommendations Based on the research we would like to advocate some recommendations to mitigate the losses that might occur due to earthquakes. • Specialist teams should be given intensive training on search, rescue and evacuation procedures. • New and latest equipments should be procured • Development policies and programs must be examined and monitored at regular intervals

  27. Recommendations • Establish web-enabled, centralized database for quick access to resources to minimize response time in emergencies. • Publicize disaster resistant design features • Review building by-laws and make it mandatory • Provide guidelines for masonry buildings • Certify builders to ensure technical competency

  28. Recommendations • Impose risk disclosure requirements on real estate agents • Retrofit the life line buildings . • Create awareness through technology demonstration. • Encourage community involvement and participation • Formulate preparedness and response plans.

  29. What we can do • Encourage our parents to insure not just for life but also for structures and household goods • Increase public awareness of the earthquake hazard • Create and distribute ‘Earthquake Preparedness Campaign’ among the students and nearby community • Conduct Mock Drills in the schools at regular intervals • Contribute towards ‘Disaster Relief Fund/PM Relief Fund’ • Provide a common platform for exchange of views among schools for discussing methods of developing and implementing Earthquake Preparedness and Evacuation plan. • Establish a good rapport with the social /voluntary agencies of the city so that help can be extended when required

  30. Time to Act Action Plan: Analyse why we need to take preventive measures in case of an Earthquake and prepare an ‘Earthquake Preparedness Campaign’ Brochure to be circulated in the school and nearby community

  31. Bibliography • http://kishanganj.nic.in/dept_relief.htm • http://bis.org.in/other/quake.htm • http://Artshttp://timesofindia.indiatimes.com/articleshow/1965231.cms • http://www.ias.ac.in/currsci/mar102007/646.pdf • http://www.karmayog.org/freepress/freepress_3638.htm • http://www.architectjaved.com/earthquake_resistant_structures/how_earthquakes_affect_reinforced_concrete_buildings_.html • http://www.architectjaved.com/earthquake_resistant_structures/planning_for_earthquake_resistant_structures.html • http://www.architectjaved.com/equake_resistant.html • http://www.ias.ac.in/currsci/mar102007/646.pdf • http://members.aol.com/physgeo/eqmod.htmhttp://cires.colorado.edu/~bilham/BhujGeodesy.html • Presentation by Shri R.K. Singh, Joint Secretary (DM), Ministry of Home Affairs • http://www.weatherwizkids.com/earthquake1.htm • http://www.4shared.com/get/54108796/de535bb1/earthquake.html;jsessionid=5A7846DDEAB13DCAC6AE32437C89EEC5.dc90 • http://www.nees.org/Education/EOTResources/EOTPresentation.ppt#15

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