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Landslides

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Miki Loop

on 23 February 2016

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Transcript of Landslides

landslides 4791.weebly.com/top-10-worst-landslides-ever.html.1981.weebly
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2. To the U.S speleological Survey (USGS) in the United States by it's self, landslides and a very serious geologic hazard mostly in every state. The USGS landslides causes in excess of $1 billion in damages and About 25 to 50 deaths each year.
1. Chiavenna Valley, Italy- 1618-2,240 dead- the entire village was covered in a moment- there were only 6 survivors
2. Golden Valley, Switzerland-1806-500 dead- thought it was a punishment of god- estimated volume of 40 million cubic meters
3. Sichuan, China-1918- over 240 dead- buried up to 40 people- forced 36,000 people to evacuate
4. Gansu, China- 1920- 180,000 dead- 45,000 had to evacuate- caused by 7.8 earthquake
5. Nebukawa , Japan-1923- 200 dead- 12,088 flooded homes- traveled 45 meters
6. Khait, Tadzhikstan USSR- 1949- 12,000 dead- triggered by earthquake- burried 33 villages- 245 cubic meters
7. Rio De Janeiro, Brazil- 1966- 550 dead- worst weather related natural disaster in brazilian history- 500 wounded
8. Chungar, Peru- 1971- 200 dead- caused by earthquake- volume of about 100,000 cubic meters
9. Hauncavelica, Peru- 1974- 300 dead- area of landslide is 200 by 300 meters- thousands had to evacuate
10. Darjeeling, India- 1980- 250 dead- more than 500 displaced- floods and monsoons increased the deaths to 1,500
1. Mostly there are three things and there will be a landslide, generally you'll have to have a very steep slop. That is the first thing. If you have have weak soil, weak geological units, and rocks. so that is site is ready for failure. And that is the second thing. And all you need to do is add that trigger, mostly a lot of water,(Rain in a very short period of time) or an earthquake. That is the last thing and then there will be a landslide.

2. So to the U.S Seological Survey (USGS) in the united states by it's self, landslides are a very serious geologic hazard mostly in every state. The USGS landslides cusses in excess of $1 billion damages and about 25 to 50 deaths each year.

3. The next frontier in landslides science is mapping where landslides have struck in the past, because that's where they're more likely to happen again.
Questions
5 Biggest in US History
5. San Francisco Bay area-in 1982- 30 dead- cost in damage- $132- 7,800 homes and businesses were seriously damaged

4. Mameyes, Puerto Rico-in 1985, 129 dead- homes destroyed- 120- caused by tropical wave which produced 31.67 inches of rain

3. Nelson County, Virginia-in 1969- 150 dead- cost in damage- $123.20- over 133 public bridges were washed out

2. Madison Canyon, Montana.-in 1959, 26 dead- only recovered 5 bodies- result of 7.5 earthquake- 40 million cubic yards of debris created Earthquake Lake

1. St. Francis Dam, California-in 1928- 500 dead- cost in damage- $14 million- 179 bodies were never recovered
Key Questions
1. What are the main causes of a landslides?
2. In which areas are landslides most likely to happen
3.What are scientists doing to help prevent loss of life and damages from landslides?
Graphs
10 wost landslides in the world
Vocabulary
1. Saturation- when the ground has absorbed all the liquid it can
2. Creep- slow landslide
3. Gravity- effect of force that pulls objects to the center of Earth
4. Precipitation- when moisture falls from clouds
5. Gradient- the rate in which a slope goes upward or downward
6. Erosion- wearing away land by wind and water
7. Landslide-the rapid movement of a slab of soil down a slope
8. Alluvial- deposited by moving water
9. Tectonic-having to do with shaping the crust of a planet or moon
10. Debris- rocks, dirt, and other objects that fall down a slope during a landslide.
11. Lahar- a landslide of wet volcanic debris on the side of a volcano
PROCESS
A landslide occurs when dirt, rock, or mud slides down a mountain. There are 4 types of ways a landslide happens. The first way is when a hill or mountain erodes and the top of the cliff falls off. Another way is when it rains and the rain turns the soil into mud and when the mud becomes heavy and slippery it slides down the slope. Also an earthquake can occur and shake the mountain which will cause rocks or wet, loose soil to fall. Finally if a volcano erupts in a cold environment the heat can melt snow which could get the soil wet and then the soil will lose it's grip and slide down the slope.
Landslides
By: Miki Loop, Bradley Bohall, Adrian Rodrigez, and Kassy Estrada
byez
.
Before:
1. Have a emergency kit and communication plan
2. Have a insurance agent
3. Have a ground assessment of your property
List of what to-do
This graph shows the number of fatalities (blue) and the number of fatal landslides (green).
After:
1. Evacuate if told to or feel unsafe
2. Stay away from slide zone
3. Listen/watch the news
4. Watch for flooding
5. Rescue others if you are not hurt (to be nice and helpful)
6. Look for broken utility lines and damaged roads then report
7. Check for other damage
8. Replant damaged soil
During:
1. Listen to news station (battery)
2. Listen for unusual sounds( cracks)
3. Avoid low areas
4. If unable to get out curl into a tight ball
Big Ideas
Likeliness of happening in Oceanside
Landslides can occur in Oceanside because there are huge hills when driving down to the ocean. If enough erosion and rainfall happens then a landslide will occur.
One way a landslide happens when the bottom of a hill or mountain erodes and the top is farther out then the bottom. Then the cliff gives off because of gravity then it repeats until the hill or mountain disappears. Another way a landslide happens is when a too much rain soaks into the hill or mountain and the cliff gives a way. Some times the two work together and a landslide happens.
A LANDSLIDE
Elevation of pore water pressure by saturation of slope material from either intense or prolonged rainfall and seepage

Vibrations caused by earthquakes

undercutting of cliffs and banks by waves or river erosion volcanic eruptions
Removal of vegetation

Reference with, or changes to, natural drainage

Leaking pipes such as water and sewer reticulation

Modification of slopes by construction of roads, railways, buildings, etc

Overloading slopes
mining and quarrying activities
vibrations from heavy traffic, blasting, etc

Excavation or displacement of rocks.
Impact
The impact of a landslide is that trees and plants can be ruined, people could die, houses could be covered, cities could be buried, and millions of dollar could be wasted. Some damages could cost up to 1 million to 1 billion dollars. The amount of people that could die is about 25- 50 deaths per landslide.
Bibliography
earthsky.org/earth/scott-burns-the-scicne-behind-landslides-disaster.
© 2015 Earthsky Communications Inc.
"Every year, in the USA, landslides cause approximately $3.5 billion in damage, and kill between 25 and 50 people."
"Landslides can vary in size, from as small as a single boulder to as large as thousands of tons of earth and debris."
"In Canada, a landslide moved a river bank as fast as 680m in less than half an hour."
"Volcanic eruptions can cause horrible landslides."
"Landslides usually occur from rainfall and friction."
"There are many signs that a landslide is happening; Cracks in the plaster, windows jam for the first time etc."
"You have to remember many things after a landslide; Stay away from the slide area, check for injured people and give first aid (if trained) etc."
"Another name for landslides are mudslides and mass effect."
"The fastest landslide ever recorded went an amazing 186 miles an hour!"
"One of the largest landslides ever went over 9 miles in a few minutes!"
"Landslides often accompany earthquakes, floods, storm surges, hurricanes, wildfires, or volcanic activity. They are often more damaging and deadly than the triggering event."
"They usually start on steep hillsides as shallow landslides that liquefy and accelerate to speeds that are typically about 10 miles per hour, but can exceed 35 miles per hour."
"When the flows reach flatter grounds the debris spreads over a broad area, sometimes accumulating in thick deposits they can wreak havoc in areas."
"The consistency of debris flows ranges of watery mud to thick, rocky mud that can carry large items such as boulders, trees, and cars. "
"There are many different types of landslides."
"Gravity is a HUGE factor of landslides."
"Landslides mostly occur in the United States."
Facts
The number of people affected by landslides worldwide
N
s
E
W
Ylvisaker Anne Landslides Mankanto,Minnasota Capstone High-Interest Books,copywrite 2003
Dasch, Julius. Earth Sciences for Students. Macmillian References USA: Visual Education Coropration, 1999
Miles, Liz. Landslides, Mudslides , and Avalanches 2008 World Book Globe producer Derisive
In this graph it shows how many plants/trees removed by landslides
Answers
Australian Gouvernement Geoscience Australia,November 5 2015,http://www.ga.gov.au/scientific-topics/hazards/landslide
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