LANDSLIDES

Question 1

is the
mass movement of rock, soil,
and debris down a slope due
to gravity. It occurs when
the driving force is greater
than the resisting force. It
is a natural process that
occurs in steep slopes.

Answer 1

Landslide

Question 2

three that cause most of the
damaging landslides around the
world are

Answer 2

Landslides and Water

Landslides and Seismic Activity

Landslides and Volcanic Activity

Question 3

are abrupt movements
of masses of geologic
materials, such as rocks and
boulders, that become detached
from steep slopes or cliffs.

Answer 3

Fall

Question 4

Separation occurs along
discontinuities such as fractures,
joints, and bedding planes and
movement occurs by free-fall,
bouncing, and rolling. Falls are
strongly influenced by gravity,
mechanical weathering, and the
presence of interstitial water.

Answer 4

Fall

Question 5

failures are
distinguished by the forward
rotation of a unit or units
about some pivotal point, below
or low in the unit, under the
actions of gravity and forces
exerted by adjacent units or by
fluids in cracks

Answer 5

Topple

Question 6

are mass movements,
where there is a distinct zone
of weakness that separates the
slide material from more stable
underlying material.

Answer 6

Slide

Question 7

Two types of slides

Answer 7

Rotational and Translational

Question 8

This is a slide in
which the surface of rupture is curved
concavely upward and the slide movement
is roughly rotational about an axis
that is parallel to the ground surface
and transverse across the slide.

Answer 8

Rotational Slide

Question 9

In this type of
slide, the landslide mass moves along a
roughly planar surface with little
rotation or backward tilting.

Answer 9

Translational slide

Question 10

are distinctive because
they usually occur on very gentle slopes or
flat terrain. The dominant mode of movement
is lateral extension accompanied by shear
or tensile fractures. The failure is caused
by liquefaction, the process whereby
saturated, loose, cohesion less sediments
(usually sands and silts) are transformed
from a solid into a liquefied state.

Answer 10

Spread/lateral spread

Question 11

are landslides that involve the
movement of material down a slope in the
form of a fluid. There are five basic
categories of flows that differ from one
another in fundamental ways.

Answer 11

Flow

Question 12

5 types of flow

Answer 12

Debris flow

Debris avalanche

Earthflow

Mudflow

Creep

Question 13

Falls are
strongly influenced by

Answer 13

gravity,
mechanical weathering, and the
presence of interstitial water.

Question 14

Falls are
strongly influenced by

Answer 14

gravity,
mechanical weathering, and the
presence of interstitial water.