GEOLOGICAL HAZARD MAP & MITIGATION STRATEGIES

• Geological hazards map


  Special-purpose map made to show various geological features and is part of the tools that can be used as precautionary measures to avoid or mitigate the effects of the different geological hazards
• Geological map


  • Shows various geological features
  • Part of the tools that can be used as precautionary measures to avoid or mitigate the effects of the different geological hazards
• Colors for rain-induced landslide prone areas


  • Yellow: Low susceptibility - less likely to experience landslide; be prepared
  • Green: Moderately susceptible; be cautious
  • Red: Highly susceptible; be alert and ready to evacuate
• Colors for flood-prone areas


  • Pink: Low to moderately susceptible; be cautious
  • Violet: Highly susceptible; be alert and ready to evacuate
• Checklist to assess landslide potential

  • Have there been landslides in the area in the past?
  • Is the house or site on or near a steep slope?
  • Is there a cliff nearby?
  • Is the ground cracked?
  • Are there any old scarps on the slope?
  • Is there a spring, seep or ponding water close by?
  • Is there a drainage channel nearby?
  • Are there any tilted or leaning trees, fences, or utility poles nearby?
  • Do the trees have bent tree trunks?
  • Is there any sign of cracking, or patched cracks in the walls or foundations?
  • Is the driveway or sidewalk cracked, patched, or down dropped?
  • Are any retaining walls cracked, tilted or off-set?
  • Have any structures such as concrete steps moved away from the house?
• Guidelines for preparing for a landslide

  • Recognition, prevention, control, and mitigation
• Preparing for a landslide

  1. Learn the condition in your area and watch out for signs of an impending landslide

  2. Keep posted on threats of landslide

  3. Know the fastest and safest way going to the nearest evacuation center

  4. Evacuate immediately in cases of non-stop rainfall and landslide threat in your area
• During a landslide

  1. If inside the house or building and evacuation is not possible: stay inside, get under a sturdy table

  2. If outside: avoid areas that may be affected by landslide, head to an elevated and safe place

  3. Do a fetal position and protect your head if landslide can no longer be avoided

  4. If driving: do not cross collapsed bridges or roads, avoid falling rocks and soil
• After a landslide

  1. Avoid places affected with landslide as the hazard might recur

  2. Watch out for possible flashfloods if the landslide blocked the water flow

  3. Check for missing persons and report it to the authorities so that rescue operations can start immediately

  4. Monitor the latest advisories and warnings, report damaged power, water and telephone lines

  5. Check for damaged foundation and other parts of the house or building, have these repaired
• Areas prone to landslides include: areas where previous landslides have occurred, steep natural slopes particularly in weak geologic materials, canyons and areas in or around drainages, developed hillsides where landscapes are irrigated, below cliffs or hills with outcrops of fractured rocks, steep slopes where surface runoff is directed onto the slope, areas where wildfires or human modification have removed vegetation from the slopes
• When building a house/high rise structure, buildings should be located away from high risk areas such as steep slopes, rivers and streams (perennial or ephemeral), and fans at the mouth of mountain channels. Consult a certified or licensed engineering geologist (CEG or LEG) or registered/licensed geologist (RG) or a professional geotechnical engineer (PE)