Lở Đất & Dòng mảnh vụn

Xem lở đất từ trên cao xuống ngọn núi có đất che phủ

Thúc đẩy người khác hành động bằng cách lấy chính mình làm gương, Cam Kết Chuẩn Bị & hãy nói với những người khác về điều đó!

Cam Kết Chuẩn Bị

Lở đất xảy ra ở tất cả các tiểu bang và vùng lãnh thổ của Hoa Kỳ và có thể do nhiều yếu tố gây ra, bao gồm động đất, bão, núi lửa phun trào, hỏa hoạn và do con người cải tạo đất. Lở đất có thể xảy ra nhanh, thường có rất ít dấu hiệu và cách tốt nhất để chuẩn bị là luôn cập nhật thông tin về các thay đổi trong và xung quanh nhà của quý vị mà có thể báo hiệu rằng lở đất có khả năng xảy ra.

Trong khi lở đất xảy ra, các khối đá, đất và mảnh vụn chuyển động xuống theo đường dốc. Các mảnh vụn và dòng bùn là các dòng đá, đất và mảnh vụn khác chìm trong nước. Lở đất phát triển khi nước tích tụ nhanh trong đất, trong khi mưa lớn hoặc tuyết tan nhanh, thay đổi đất trong dòng bùn hoặc "bùn than" chảy mạnh. Lở đất có thể chảy nhanh, có ít hoặc không có cảnh báo với tốc độ dồn dập. Lở đất cũng có thể đi cách nguồn của chúng vài dặm, phát triển về quy mô khi làm bật gốc cây, các tảng đá, xe hơi và vật liệu khác.

Các vấn đề về lở đất có thể bị gây ra bởi sự quản lý đất kém, đặc biệt ở các vùng núi, hẻm núi và bờ biển. Trong các khu vực bị đốt cháy bởi cháy rừng hoặc bụi cây, lượng mưa nhỏ có thể gây lở đất. Sự phân vùng sử dụng đất, kiểm tra chuyên nghiệp và thiết kế phù hợp có thể giảm thiểu nhiều vấn đề về lở đất, dòng bùn và dòng mảnh vụn.

A house destroyed by a landslide.Before a Landslide

The following are things you can do to protect yourself, your family and your property from the effects of a landslide or debris flow:

  • To begin preparing, you should build an emergency kit and make a family communications plan.
  • Prepare for landslides by following proper land-use procedures - avoid building near steep slopes, close to mountain edges, near drainage ways or along natural erosion valleys.
  • Become familiar with the land around you. Learn whether debris flows have occurred in your area by contacting local officials. Slopes where debris flows have occurred in the past are likely to experience them in the future.
  • Get a ground assessment of your property.
  • Consult a professional for advice on appropriate preventative measures for your home or business, such as flexible pipe fittings, which can better resist breakage.
  • Protect your property by planting ground cover on slopes and building retaining walls.
  • In mudflow areas, build channels or deflection walls to direct the flow around buildings. Be aware, however, if you build walls to divert debris flow and the flow lands on a neighbor's property, you may be liable for damages.
  • If you are at risk from a landslide talk to your insurance agent. Debris flow may be covered by flood insurance policies from the National Flood Insurance Program (NFIP).
Recognize Landslide Warning Signs
  • Changes occur in your landscape such as patterns of storm-water drainage on slopes (especially the places where runoff water converges) land movement, small slides, flows, or progressively leaning trees.
  • Doors or windows stick or jam for the first time.
  • New cracks appear in plaster, tile, brick, or foundations.
  • Outside walls, walks, or stairs begin pulling away from the building.
  • Slowly developing, widening cracks appear on the ground or on paved areas such as streets or driveways.
  • Underground utility lines break.
  • Bulging ground appears at the base of a slope.
  • Water breaks through the ground surface in new locations.
  • Fences, retaining walls, utility poles, or trees tilt or move.
  • A faint rumbling sound that increases in volume is noticeable as the landslide nears.
  • The ground slopes downward in one direction and may begin shifting in that direction under your feet.
  • Unusual sounds, such as trees cracking or boulders knocking together, might indicate moving debris.
  • Collapsed pavement, mud, fallen rocks, and other indications of possible debris flow can be seen when driving (embankments along roadsides are particularly susceptible to landslides).

During a Landslide

  • During a severe storm, stay alert and awake. Many deaths from landslides occur while people are sleeping.
  • Listen to local news stations on a battery-powered radio for warnings of heavy rainfall.
  • Listen for unusual sounds that might indicate moving debris, such as trees cracking or boulders knocking together.
  • Move away from the path of a landslide or debris flow as quickly as possible. The danger from a mudflow increases near stream channels and with prolonged heavy rains. Mudflows can move faster than you can walk or run. Look upstream before crossing a bridge and do not cross the bridge if a mudflow is approaching.
  • Avoid river valleys and low-lying areas.
  • If you are near a stream or channel, be alert for any sudden increase or decrease in water flow and notice whether the water changes from clear to muddy. Such changes may mean there is debris flow activity upstream so be prepared to move quickly.
  • Curl into a tight ball and protect your head if escape is not possible.

After a Landslide

  • Go to a designated public shelter if you have been told to evacuate or you feel it is unsafe to remain in your home. Text SHELTER + your ZIP code to 43362 (4FEMA) to find the nearest shelter in your area (example: shelter 12345).
  • Stay away from the slide area. There may be danger of additional slides.
  • Listen to local radio or television stations for the latest emergency information.
  • Watch for flooding, which may occur after a landslide or debris flow. Floods sometimes follow landslides and debris flows because they may both be started by the same event.
  • Check for injured and trapped persons near the slide, without entering the direct slide area. Direct rescuers to their locations.
  • Look for and report broken utility lines and damaged roadways and railways to appropriate authorities. Reporting potential hazards will get the utilities turned off as quickly as possible, preventing further hazard and injury.
  • Check the building foundation, chimney, and surrounding land for damage. Damage to foundations, chimneys, or surrounding land may help you assess the safety of the area.
  • Replant damaged ground as soon as possible since erosion caused by loss of ground cover can lead to flash flooding and additional landslides in the near future.
  • Seek advice from a geotechnical expert for evaluating landslide hazards or designing corrective techniques to reduce landslide risk. A professional will be able to advise you of the best ways to prevent or reduce landslide risk, without creating further hazard.

Related Websites

Find additional information on how to plan and prepare for a landslide or debris flow emergency and learn about available resources by visiting the following websites:

Listen to Local Officials

Learn about the emergency plans that have been established in your area by your state and local government. In any emergency, always listen to the instructions given by local emergency management officials.

Last updated: 03/03/2014 - 10:14 AM