DRRR: Earthquake Hazards
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Earthquake Hazards (with hazard maps of Cavite)
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DRRR: Earthquake Hazards
- 2. WHAT IS AN EARTHQUAKE? “The perceptible shaking of the surface of the Earth, resulting from sudden release of energy in the Earth’s crust that creates seismic waves.” (United States Geological Science-USGS)
- 3. LET US RECALL! • Fault or fault plane- where the ground split • Hypocenter- where earthquake originates • Epicenter- where it occurs at the earth surface • Convergent Boundary- when one plate is force over another during an earthquake • Divergent Boundary- when plates drifted apart from each other • Transform Fault- when plates slip by each other.
- 4. LET US RECALL! • Intensity- earthquake’s property that indicates the effects and damage caused by • batay sa sa naramdaman ng mga tao at sa epekto sa kapaligiran at mga gawang (Intensity I-X)
- 5. LET US RECALL! • Magnitude- a value that tells the reader the amount of seismic energy released by an earthquake. • impormasyon mula sa instrument gaano kalakas ang enerhiya na inilabas lindol (M= 7.2)
- 6. EARTHQUAKE HAZARDS Ground shaking or Ground motion Ground Surface Rupture Liquefaction Tsunami Earth-quake induced Landslide
- 7. Measured in the: 1. Velocity of ground motion 2. Acceleration of ground motion 3. Frequency content of the shaking 4. Duration
- 11. WHEN WILL THE “BIG ONE” HAPPEN? No one knows! What science knows is, the return period of earthquake is about 200 - 400 years and large earthquake has happened in the West Fault since the 1700s. The last was in 1658 years ago)
- 16. Signs of an Impending TSUNAMI 1. ANIMAL BEHAVIOR Zoologist hypothesize that some animal species like elephants have the ability to sense subsonic Rayleigh waves from an earthquake or a tsunami. 2. DRAWBACK 3. SOUND SIMILAR TO AN INCOMING TRAIN
- 18. ALERT LEVEL REKOMENDASYON SA MGA APEKTADONG LUGAR 3 LUMIKAS Dapat agarang lumikas ang mga komunidad na nasa baybaying-dagat patungo sa mas mataas na lugar o papalayo sa baybaying- dagat 2 MAGMATYAG Pinapayuhan ang publiko na maging alerto sa mga di-pangkaraniwang alon sa karagatan; lumayo sa baybaying-dagat at huwag magtungo sa dalampasigan para panoorin ang tsunami
- 19. ALERT LEVEL REKOMENDASYON SA MGA APEKTADONG LUGAR 1 MAGHANDA Walang pinaiiral na utos ng paglikas 0 HUWAG MABAHALA Walang babala. Hindi kailangan ng paglikas.
- 21. WHAT TO DO BEFORE, DURING AND AFTER AN EARTHQUAKE
- 25. NDRRMC NATIONAL DISASTER RISK REDUCTION MANAGEMENT COUNCIL • (02) 426-1468 to 79, local 124/125 • Text/Call: 0905-3134077 • Text Only: 0918-9428354
- 26. CONTACT US: http://www.phivolcs.dost.gov.ph @phivolcs_dost Philippine Institute of Volcanology and Seismology (PHIVOLCS- DOST) Earthquake & Tsunami (24/7): Tel. Numbers • +632 929-9254 • +632 426-1468 loc 124 / 125 • +632 927-1087 (Telefax)
- 36. • Do not use your telephone to call relatives and friends. Disaster prevention authorities may need the lines for emergency communications. • Do not use your car and drive around disaster- striken areas. Rescue and relief operations need the roads for mobility. • Check your water and electrical lines for defects. If any damage is suspected, turn the system off in the main valve or switch.
- 37. TRAPPED? • Pray • Check pockets or bags for lighter – anything that will help you scratch, dig, screw or signal way out. • Make noise (bang pipes, car horn, whistle, etc.) • Conserve energy • Do not drink urine or alcohol (man can survive 10 days without food; 3 days without water; no one drinks on the first day) • Mobile phones: text instead of calling, or be concise if
Notas del editor
- Quake, tremor, or temblor
- Quake, tremor, or temblor
- Intensity- it can be determined by taking the stock of devastation in the area affected. (Mercalli Scale; Giuseppe Mercalli 1902)
- Magnitude- calculated by measuring the amplitude of the seismic waves through a seismometer.
- The Earth shakes with the passage of earthquake waves, which radiate energy that had been “stored” in stressed rocks, and were released when a fault broke and the rocks slipped to relieve the pent-up stress. Ground shaking will vary over topography, bedrock type, and the location and orientation of the fault rupture.
- The entire City of Bacoor is susceptible to experience up to Intensity 8 of ground shaking should there be any movement in the nearby West Valley Fault Line that generates a Magnitude 7 earthquake with a depth of 10kms.
- Any structure built across the fault is at risk of being torn apart as the two sides of the fault slip past each other. Dip-slip faulting (vertical offset) Strike-slip faulting (lateral offsets)
- Phenomenon in which the strength and stiffness of a soil is reduced by earthquake or other rapid loading. It normally occurs in saturated soil (in which the space between individual particles is completely filled with water). Liquefied soil will force open ground cracks in order to escape to the surface. Ito ay naoobserbahan lamang sa mga lugar na binubuo ng sediments (putik, buhangin) o lupa na nakababad sa tubig Ang sediments o lupa sa ilalim ng water table ay pansamantalang nawawalan ng tibay
- 32 barangays in the City of Bacoor are highly susceptible to liquefaction (the process by which saturated, unconsolidated sediments are transformed into a substance that acts like a liquid), while 23 other barangays are moderately susceptible and 9 more barangays have low susceptibility to liquefaction.
- A series of waves in water body caused by the displacement of large volume of water.
- Series of waves in a water body caused by the displacement of a large volume of water.
- 23 barangays in the City of Bacoor are highly susceptible to tsunami inundation.