Term
| Mass wasting is the(Blank, Blank) movement of earth material such as regolith or solid rock under the influence of gravity |
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| Regolith is all of the materials lying between unweathered bedrock below and the earth's surface above |
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| Gravity, a force, can be represented by a vector. A vector has both (Blank)and (Blank) |
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| Gravity acting across a sloped or inclined surface can be broken into a (Blank) and a (Blank) component. |
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Term
| A landslide is defined as the downward and outward movement of slope-forming materials. True or false |
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Term
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. Select from the following list of material that might exist prior to a landslide.
a) rock
b) Soil
c) earth
d) Mud
e) Debris |
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Definition
| a-e(all materials listed) |
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Term
Select from the following list the type of movement that might occur during a landslide.
a) falling
b) Sliding
c) Spreading
d) Flowing
e) Running |
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Definition
| a-d are the common types of movement associated with landslides |
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Term
| Rock is defined as any (blank), (blank), and firm mass that existed in it natural place prior to a landslide |
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Term
| Soil is an aggregate of (Blank) and (blank) +/- organic material that formed from the in situ weathering of rock or sediment |
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Term
| What might fill the voids and spaces between mineral or rock fragments in a soil? |
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Term
Material defined as earth is composed of:
a) 80% or more particles smaller than 0.06 mm
b) 20% to 80% oarticles larger than 2 mm
c) 80% or more particles smaller than 2 mm |
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Definition
| c) 80% or more particles smaller than 2 mm |
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Term
Material defined as mud is composed of:
a) 80% or more particles smaller than 0.06 mm
b) 20% to 80% particles larger than 2 mm
c) 80% or more particles smaller than 2 mm |
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Definition
| a) 80% or more particles smaller than 0.06 mm |
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Term
Material defined as debris is composed of:
a) 80% or more particles smaller than 0.06
b) 20% to 80% particles larger than 2 mm
c) 80% or more particles smaller than 2mm |
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Definition
| b) 20% to 80% particles larger than 2 mm |
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Term
| A complex landslide commonly involves two or more of the classes, (blank), (blank), (blank), or (blank) |
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Definition
| fall, slide, spread, flow |
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Definition
| The term rock falls represents both a process and the resulting deposit. The process inolves 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 |
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Definition
| A 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 detached from the substrate it appears to pitch and rotate forward. |
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Term
| What is the common term that is synonymous with slide? |
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Definition
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Term
| A slide forms when a coherent mass of regolith or bedrock breaks free and then slides down slope along either a (blank), or (blank) surface |
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Definition
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Term
| What are the two major types of landslides that fall under the heading of slide? |
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Definition
| translational and rotational |
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Term
| Is the surface of failure for a translational slide planar or curved?? |
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Definition
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Term
| Is the surface of failure for a rotational slide planar or curved? |
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Definition
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Term
| How does a translational slide differ fro m a block slide? |
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Definition
| A block slide is a special type of translational slide. It involved material that is hard and intact enough to slide down slope as a relatively coherent mass. |
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Term
| Liquefaction is the process by which water saturated, loose, cohesion less sediments are transformed from a (blank) into a (blank) state |
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Term
| On what type of slope would a lateral spread likely occur on: Gentle or steep? |
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Definition
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Term
| Failure during a lateral spread is caused by what? |
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Definition
| Liquefaction, which typically occurs as a result of ground shaking during an earthquake |
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Term
| Water saturated fine grained slope material that liquefies and then runs out, leaving a bowl-shaped depression on the sloping land surface are called (blank) |
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Term
| Are earth flows generally faster or slower than mudflows? |
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Definition
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Term
Material in an earthflow is composed of
a) 80% or more particles smaller than 0.06 mm
b) 20% to 80% particles larger than 2 mm
c) 80% or more particles smaller than 2 mm |
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Definition
| c) 80% or more particles smaller than 2mm |
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Term
| how would you describe the outline of the source area, main track, and site of deposition of an earth flow if you could view it in an airplane? |
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Definition
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Term
| 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? |
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Definition
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Term
| A debris flow is commonly described as having the consistency of what common mixture? |
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Definition
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Term
Material in a debris flow is composed of:
a) 80% or more particles smaller than 0.06 mm
b) 20% to 80% particles larger than 2mm
c) 80% or more particles smaller than 2 mm |
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Definition
| b) 20% to 80% particles larger than 2 mm |
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Term
Debris flows can reach speeds of
a) 26 km/hours
b) 36 km/hour
c) 50 km/hour
d) 56 km/hour
e) 66km/hour |
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Definition
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Term
| Can debris flows carry particles as large as a house? |
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Definition
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Term
| A mud flow differs from a debris flow in what way? |
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Definition
| It is composed of finer grained material. For example, a mudflow is composed of 80% or more particles less than 0.06 in size, while a debris flow is composed of 20% to 80% particles larger than 2 mm in size |
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Term
| The imperceptible slow and steady down slope of movement of the regolith is called (blank) |
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Definition
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Term
| List at least 4 line of evidence for creep |
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Definition
| bent trees, roads, railroad tracks, retaining walls, the down slope tilting of layered rocks |
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Term
| Permafrost is soil that must remain frozen for at least (blank) consecutive years |
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Definition
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Term
| What happens to the topmost or surface portion of permafrost during the summer? |
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Definition
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Term
| The slow imperceptible down slope motion of the topmost or surface portion of permafrost is called (blank) |
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What common type ofrock underlies Mount Soledad in La Jolla, California?
a) Gneiss
b) Granite
c) Shale
d) Conglomerate
e) Rhyolit |
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Definition
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Term
| Have geologists mapped ancient landslides in the Mount Soledad Region? |
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Term
A Major Right-Lateral strike-slip fault system transects the Mount Soledad region and is called the:
a) San Andreas Fault System
b) San Jacinto fault SYstem
c) Rose Canyon-Country Club fault system
d) Elsinore fault system
e) Garlock Fault system |
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Definition
| c) Rose Canyon-Country club fault system |
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Term
| Is there recent historical evidence of landslide activity in the Mount Soledad area? |
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Definition
| yes, several have occured since 1961 |
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Term
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? If not, then why not? |
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Definition
| No, the Mount Soledad area is well known for its susceptibility to landslides |
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Term
| Between March 4, 1995 and january 10, 2005 two landslides occured at La Conchita, califonia. How is the 1995 Landslide classified? |
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Definition
| A Complex-Slump earth flow |
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Term
| Was anyone killed during the March 4, 1995 landslide? |
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Definition
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Term
| During January 10, 2005 landslide was new material involved or did the January 10 landslide simply reactive portions of the older slide? |
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Definition
| the SE portion of the old landslide material was reactivated |
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Term
| How was the january 10, 2005 landslide at La Conchita classified? |
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Definition
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| How many people were killed by the January 10 landslide? |
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Definition
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Term
| How would you describe the weather conditions that preceded the January 10, 2005 and March 4, 1995 landslides at La Conchita |
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Definition
| Intense long periods of rainfall preceded both landslides |
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Term
| 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? |
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Definition
| The Rincon Mountain landslide |
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Term
| Do you consider La Conchita a safe place to live? If not, then why not? |
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Definition
| La Conchita is not a safe place to live. As noted by Larry Gurrola, other landslides are highly likely especially following intense long periods of rainfall. |
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