DRRR (LANDSLIDES)

Question 1

is defined as the movement of a mass of rock, debris, or earth down a slope

Answer 1

Landslides

Question 2

__________prevent the mass from sliding down the slope

Answer 2

Resisting forces

Question 3

Landslides are a type of __________ which denotes any down-slope movement of soil and rock under the direct influence of gravity.

Answer 3

mass wasting

Question 4

three distinct events that happen during a landslide

Answer 4

initial slope failure
subsequent transport
final deposition of the slide materials

Question 5

True or False. It is very important to distinguish the different types of landslides to be able to understand how to deal with each of them

Answer 5

True

Question 6

Causes of Landslides

Answer 6

Climate Change
ANTHROPOGENIC FACTORS
Combination Factors

Question 7

Climate Change (8)

Answer 7

Heavy rains
Earthquakes
Gravity
Volcanic eruptions
Floods
Groundwater changes
Rapid Snowmelt
Quarrying

Question 8

Types of Landslides

Answer 8

Rational Landslide
Translational Landslide
Rock Fall
Lateral Spreading
Debris Flow

Question 9

move along a surface or rupture that is curved and concave

Answer 9

Rotational Landslide

Question 10

occurs when the failure surface is approximately flat or slightly undulated

Answer 10

Translational Landslide

Question 11

free falling of detached bodies of bedrock (boulders) from a cliff or steep slope

Answer 11

Rock Fall

Question 12

occurs when the soil mass spreads laterally and this spreading comes with tensional cracks in the soil mass

Answer 12

Lateral Spreading

Question 13

down slope movement of collapsed, unconsolidated material typically along a stream channel

Answer 13

Debris Flow

Question 14

Indicators of Landslide Phenomenon

Answer 14

-Terrain/ Morphologic Features indicating risks of a Landslide
-Landslide Risk Indicators

Question 15

How to minimize Landslide hazards?

Answer 15

Passive drainage
Active Prevention Intervention
Non- Structural measures
Landslide Hazard Mapping

Question 16

It is a topographic depression created when ground water dissolves the underlying limestone bedrock

Answer 16

Sinkhole

Question 17

It occurs in areas where the soil foundation is made up of soft minerals and rocks such as

Answer 17

limestone, salt beds or any acidic rocks

Question 18

are the regions where the type of rock below the land surface can naturally be dissolved by underground water circulating through them

Answer 18

KARST TERRAIN

Question 19

Types of SINKHOLE

Answer 19

Cover Collapsed
Cover Subsidence
Dissolution
Manmade/Artificial

Question 20

may develop abruptly (over a period of hours) and cause catastrophic damages. They occur where the covering sediments contain a significant amount of clay

Answer 20

Cover Collapsed

Question 21

occur at the ground surface where bedrock is exposed or is very shallow, and result from rainfall and surface water percolating through the bedrock’s joints and fractures

Answer 21

Dissolution

Question 22

Cover-tend to develop gradually where the covering sediments are permeable and contain sand

Answer 22

Cover subsidence

Question 23

are created when city development compromises the structural integrity of underlying rock.

Answer 23

Manmade/Artificial

Question 24

Human Activities that Trigger
the Formation of Sinkholes

Answer 24

•Over-withdrawal of groundwater
•Diverting surface water from a large area and concentrating it in a single point
•Artificially creating ponds of surface water
•Drilling new water wells

Question 25

Various Causes of Sinkholes

Answer 25

Water Human Activities Earthquake induced sinkholes

Question 26

Various causes of sinkholes: water

Answer 26

If the rock doesn’t dissolve in the water Surface water Changes in the hydrolic System Changing groundwater gradient Weathering