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56 Cards in this Set

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Mass wasting is the ____________ ____________ movement of Earth material such as
regolith or solid rock under the influence of gravity.
down slope
What is regolith?
Regolith is all of the materials lying between unweathered bedrock below and the Earth’s
surface above
Gravity, a force, can be represented by a vector. A vector has both _____________ and
______________.
Magnitude and direction
Gravity acting across a sloped or inclined surface can be broken into a
__________________ and a ____________________ component.
tangenital and normal
________ defined as the downward and outward movement of slope‐forming
materials.
landslide
Landslides are classified on the basis of the type of material that existed prior to the
landslide and the type of movement that dominates during the landslide. what types of material that might exist prior to a landslide.
rock, soil, mud, earth, debris
what is the type of movement that might occur during a
landslide.
fall, slide, spread, flow
Rock is defined as any _______, _______, and firm mass that existed in its
natural place prior to a landslide.
intact, hard and firm
Soil is an aggregate of _________________ and ___________
_________________ ± organic material that formed from the in situ weathering
of rock or sediments.
minerals and rock fragments
What might fill the voids and spaces between mineral or rock fragments in a
soil?
gas and water
Material defined as earth is composed of
80% or more particles smaller than 2 mm
Material defined as mud is composed of
80% or more particles smaller than 0.06 mm
Material defined as debris is composed of
20% to 80% particles larger than 2 mm
A complex landslide commonly involves two or more of the classes
_______________, ______________, _______________, or _______________.
flow, slide, fall, spread
What are rock falls
rock fall represents both a process and the resulting deposit. The process involves
the falling for some distance through the air, or the bouncing and rolling down slope of solid
material or soil on a steep slope. The typically broken and shattered material resulting from
this process is also called a rock fall
What are topples?
topple is a rock fall that involved the forward rotation of a detached block above a pivotal
point located in the lower part of the detached material. When the block detaches from the
substrate it appears to pitch and rotate forward
What is a common term that is synonymous with slide
topple
A slide forms when a coherent mass of regolith or bedrock breaks free and then
slides down slope along either a ___________________ or ________________
surface.
planar or curved
What are the two major types of landslides that fall under the heading of slide
translational and rotational
What is a common term that is synonymous with slide?
topple
slide forms when a coherent mass of regolith or bedrock breaks free and then
slides down slope along either a ___________________ or ________________
surface.
planar or curved
What are the two major types of landslides that fall under the heading of slide?
tranlational and rotatioal
Is the surface of failure for a translational slide planar or curved
planar
Is the surface of failure for a rotational slide planar or curved
curved
How does a translational slide differ from a block slide
block slide is a special type of translational slide. It involves material that is hard and
intact enough to slide down slope as a relatively coherent mass
Liquefaction is the process by which water saturated, loose, cohesionless
sediments are transformed from a _______________ into a ______________
state.
solid to a liquid-like
On what type of a slope would a lateral spread likely occur on: gentle or steep
gentle
Failure during a lateral spread is caused by what
liquefraction-as result of ground shaking from and earthquake
Water‐saturated fine‐grained slope material that liquefies and then runs out,
leaving a bowl‐shaped depression on the sloping land surface are called
_______________.
mudflows
Are earthflows generally faster or slower than mudflows
slower
Material in an earthflow is composed of
80% or more particles smaller than 2 mm
How would you describe the outline of the source area, main track, and site of
deposition of an earthflow if you could view it in an airplane
as an hour glass
Given a steep sloped terrain with a mantle of loose coarse debris, what might
happen following an intense torrential rainfall or the melting of large amounts of
snow and ice during a spring thaw?
debris flow will form
A debris flow is commonly described as having the consistency of what common
mixture?
wet cement
Material in a debris flow is composed of
20% to 80% particles larger than 2 mm
Debris flows can reach speeds of
56km/hr
Can debris flows carry particles as large as a house?
yes
A mudflow differs from a debris flow in what way
It is composed of finer grained material.
The imperceptible slow and steady down slope movement of the regolith is
called _______________.
creep
List below at least 4 lines of evidence for creep
Bent trees, roads, railroad tracks, retaining walls, and the down slope tilting of layered rocks
Permafrost is soil that must remain frozen for at least _________ consecutive
years.
two
What happens to the topmost or surface portion of permafrost during the
summer?
melts
The slow imperceptible down slope motion of the topmost or surface portion of
permafrost is called _________________.
Solifluction
What common rock type underlies Mount Soledad in La Jolla, California
shale
Have geologists mapped ancient landslides in the Mount Soledad region
yes
A major right‐lateral strike‐slip fault system transects the Mount Soledad region
and is called the
rose canyon
Is there recent historical evidence of landslide activity in the Mount Soledad
area?
yes
On October 3rd, 2007, a large mass of the slope lying between Soledad Mountain
Road and Desert View Drive, La Jolla, California detached and began sliding down
slope. Given your answers to questions 50 through 53, should the residents of
this area have been surprised?
no, the area is known for land slides
Between March 4, 1995 and January 10, 2005 two landslides occurred at La
Conchita, California. How is the 1995 landslide classified
complex slump‐earthflow
Was anyone killed during the March 4, 1995 landslide
no
During the January 10, 2005 landslide was new material involved or did the
January 10 landslide simply reactive portions of the older slide
SE portion of the old landslide material was reactivated
How was the January 10, 2005 landslide at La Conchita classified
debris flow
How many people were killed by the January 10 landslide?
10
How would you describe the weather conditions that preceded the January 10,
2005 and March 4, 1995 landslides at La Conchita
Intense long periods of rainfall preceded both landslides
As it turns out, the January 10, 2005 and March 4, 1995 landslides at La Conchita
are only small parts of a much larger ancient landslide. What is the name of this
larger and more ancient feature
The Rincon Mountain landslide
Do you consider La Conchita a safe place to live? If not, then why not
La Conchita, though beautiful is clearly not a safe place to live. As noted by Larry Gurrola,
other landslides are highly likely especially following intense long periods of rainfall