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Natural Disasters > Exam 2 > Flashcards

Exam 2 Flashcards

0
Q

Explain the process that heats up the earth’s atmosphere

A

Solar radiation hits the surface of the earth
Heat get absorbed but infrared bounces out and the green house gas capture that and store the energy
This heats up the atmosphere

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1
Q

The “hokey stick” diagram shows

A

A dramatic increase in temperature compared to the average

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2
Q

What is the component of volcano eruptions contributing to global warming and global cooling

A

The co2 and water vapor that builds up and erupts but the sulfuric acid that comes out also reflects solar radiation and helps with cooling

Overall contribute global cooling more

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3
Q

What contributes to natural cycles of global cooling and warming

A
  1. Changes in eccentricity
  2. Changes in the tilt of the earth
  3. The earths precession (wobbling)

All together create cyclical climate changes?

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4
Q

Sea ice is lost

A

Abruptly

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5
Q

Positive aspects of loss of sea ice

A

New trade routs

Loss of sea ice is unlikely to result in sea level

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6
Q

Runaway global warming is

A

Fed by the thawing and the release of methane gas

Methane gas captures the most energy

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7
Q

What is deformation

A

The change a rock body undergoes in volume and/shape

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8
Q

what are the types of stress

A
  1. Compression-pushing it together
  2. Tension-pulling it apart
  3. Shear- pushing together put forces are offset
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9
Q

What are the three types of deformation

A
  1. Elastic-temporary and reversible once stress is relieved (think Rubber band)
  2. Plastic-permanent folding of the rock
  3. Brittle-permanent fracturing of the rock
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10
Q

as a rock get hotter it becomes more

as a rock get colder it beomes more

A

hotter it gets becomes or plastic

colder it becomes more brittle

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11
Q

zone of brittle deformation is above the

A

the zone of plastic deformation (15km)

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12
Q

earthquakes are associated with

A

brittle deformation (fracture)

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13
Q

what is a fault

A

a fracture in the earths crust that shows clear displacement of one side relative to the other

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14
Q

what are the types of faults

A
  1. Dip-slip faults(vertical offset)
    a. normal faults
    b. reverse and thrust faults
  2. Strike-slip faults
    a. right-lateral
    b. left-lateral
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15
Q

Hanging wall and foot wall is associated with

A

dip-slip faults
HW sits above the fault
FW sits below the fault

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16
Q

how do you know if it is a normal fault

A

HW moves down in relation to the FW

(caused by tension) common with oceanic ridges

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17
Q

How do you know if it is a reverse fault

A

HW moves up in relation to the FW

(Caused by compression) common with convergent plate boundaries EX oceanic trenches

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18
Q

how do you know if there is strike fault

A

you must look from above the ground

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19
Q

how to tell if it is right lateral or left lateral?

A

if the other side of the fault has moved right it is right lateral
if it has moved left then it is a left lateral

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20
Q

strike-slip faults are associated with

A

shear stress (transform plate boundaries)

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21
Q

where ever you have a bend in a strike-slip fault

A

you will always have a localized area of either compression or tension.

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22
Q

how do you know if it is right stepping

A

if it curves the right (following the line to the right)

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23
Q

An earthquake is

A

a vibration of the earth produced by rapid release of energy.

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24
Q

The Great San Francisco Earthquake

A

April 18, 1906
80% of damage was caused by fire (Ham and Eggs Fire)
official death count 700 but 5000 died from indirect result
occurred on the San Andreas Fault

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25
Q

Elastic Rebound theory

A

it is two sides in constant motion, but offset occurs during earthquake (once it breaks it springs back to original shape)

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26
Q

the motion across the San Andreas fault moves @

A

6 cm per year (about 2 inches per year)

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27
Q

What is a fault creep

A

it is where constant motion occurs every year (wont have have earthquakes)

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28
Q

Deep Earthquakes occur

A

on oceanic trenches

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29
Q

Benioff Zone

A

is a zone of earthquake activity associated with subduction

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30
Q

the source of the earthquake is

A

the hypocenter

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31
Q

directly above the hypocenter (source of the earthquake)

A

the epicenter

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32
Q

how do we record seismic waves

A

with seismographs

33
Q

what are the two types of waves

A

Body waves and surface waves

34
Q

body waves

A

travel through the earths interior

1) primary waves
2) secondary waves

35
Q

Surface waves

A

They are L-waves (long) that travel along the surface of the earth

1) Raleigh waves
2) love waves

36
Q

seismic waves are a

A

form of elastic energy

37
Q

P-waves definition

A

a wave of compression and the only wave that changes the volume of the rock as it passes through (all other waves changes the shape of the rock)
Think of slinky example

38
Q

S-wave definition

A

they vibrate perpendicular to direction the wave is traveling thus changing the shape of the rock as it passes through (think of rope example)

40
Q

differences between Rayleghieh waves and Love waves

A

Rayleigh waves have up and down motion (rotate backwards as they travel forward) and love waves have side to side motion

41
Q

List the waves from fastest to slowest

A

the first waves are the P-waves
S-waves
Finally the L-waves (most dangerous)

42
Q

How locate the epicenter?

A
  1. determine the P-S Interval (time between p arrives and S arrives) [greater the interval the farther you are from epicenter]
  2. Triangulation (must have three pinpoints)
43
Q

How do we measure earthquakes?

A

1) intensity- the effect of an earthquake at any given local
[Modified Mercalli Intensity Scale goes from 1-12]
2) Magnitude- earthquake strength
[Magnitude Scale]

44
Q

Explain the Magnitude Scale

A

each time you move once on the scale (ex 3 to 4) the ground shaking increases 10 times and energy released in 30 times.
[If it moves up 2M the it would 100 times more shaking and 900 times more energy released]

45
Q

What are the two measurements to determine magnitude

A
  1. P-S interval

2. the amplitude of the S-wave

46
Q

What do we know about intraplate earthquakes

A
  1. they are often large magnitude events
  2. the probably occur along zones of weekend crust
  3. the recurrence intervals are usually large (centuries)
    ex. New Madrid (1811-1812) Missouri
47
Q

What are the destructive effects of earthquakes?

A
  1. Ground shaking
  2. Fire
  3. Tsunami (seismic Sea Waves)
  4. Land slides
48
Q

Two key factors to think about in ground shaking

A

A) Building Design

B) Nature of the Ground material

49
Q

Best building material for homes

A

it most be strong and flexible (riding the vibrations out)

ex. wood and steel (frame structure)

50
Q

What is base shear?

A

Result from love waves (moving from side to side)

we want to avoid soft first stories

51
Q

What is resonance?

A

it is when the building is in sync with the wave period of motion of the seismic wave

the factors are the building heights and the different ground material Ex. tall building with soft ground (worst case scenario)

52
Q

Soft material for building

A

is the worst material because it enhances ground vibrations.

53
Q

when does liquefaction occur?

A

it occurs with firm ground

  1. cubic packing (loosely compacted soil)
  2. during earthquake it becomes hexagonal packing limiting space for water
  3. water shoots out with tremendous pressure (sand blows) Stuff sink in the ground
54
Q

how are tsunami’s produced

A

by a rapid displacement in the water (must be vertical displacement)

55
Q

tsunami generated by earthquake is called

A

seismic sea wave

never use tidal wave ever

56
Q

name the major fault that San Diego should be concerned with?

A

Rose Canyon Fault

1-2% chance of earthquake occurring within 30 years

57
Q

example of intraplate earthquake

A

Libson, Portugal (1755) (and New Madrid)
fire
tsunami
buildings collapsed

58
Q

example of a subduction earthquake

A

Alaska (1964)

9.2 magnitude

59
Q

Landers/Big Bear Earthquake

A

Lander 7.5 M triggered Big Bear 6.5 M [3 hour separation]

did not occur on san Andreas Fault

60
Q

Northridge Earthquake

A

large earthquake under a major metropolitan area
61 people died and $25 billion in damages
-Caused by blind thrust fault

61
Q

Can we predict Earthquakes?

A

We can predict where an earthquake
we can make longer term predictions on earthquakes occurring
Our short-term prediction is still in development
BUT other nations have predicted in short term (china)

62
Q

What are the methods of Earthquake prediction?

A

1) Locating seismic maps
2) Determining Recurrence intervals
3) Measuring dilatancy
4) observing unusual animal behavior

63
Q

what are seismic gaps?

A

area where no significant Earthquake has been recorded because

1) fault creep (constant motion)
2) no motion and stress is building up

64
Q

recurrence interval is

A

determining the average length of time between earthquakes of a given magnitude

65
Q

The stages of dilatency

A

Stage 1: Micro-crack formation
Stage 2: Dilation (expansion)
Stage 3: Influx of water
Earthquake

66
Q

How do we measure dilatancy in a rock

A

ground tilt
Foreshock
Measure electrical conductivity of the rock
measure radon level

67
Q

What is mass wasting?

A

the downslope of material under the influence of gravity

68
Q

landslide

A

a general term for any rapid for of mass wasting

69
Q

What are the controls of mass wasting

A

1)gradient (angle of slope) and stability of the slope
2) water
and obviously gravity

70
Q

what is the angle of repose?

A

the measure stability of slope (steepest angle at which material remain stable)

71
Q

when pore of sediment is filled with water (what happens)

A

1) added weight
2) lubrication
3) loss of cohesion (little bit of water adds to cohesion)

72
Q

what do we use to classify the type of mass wasting

A
  1. type of material
  2. type of motion
  3. Velocity (rate) of motion
73
Q

Solid bedrock=
non-saturated soil=
water-saturated soil=
Soil and rock=

A

Rock
Earth
Mud
Debris

74
Q

A) Fall
B) Slide
C)Flow

A

A. “free-fall” or “rock fall”
B. intact body that moves down a well defined surface ex slump (going down curve surface)
C. moves down as viscous liquid (not intact) ex. mudflows, earthflows and debris flow

75
Q

the term for a fast form of mass wasting is

A

avalanche

76
Q

the term for the slowest form of mass wasting

A

hillside creep

77
Q

What is Asperite

A

it is a high friction are (stable rough spot)

Associated with periodic fault movement

78
Q

Gros Ventre, Wyoming [1925]

A

this was a rock slide in 1925-caused by heavy amount of rainfall (made the rock heavy the layer of clay was made slippery and slide down)
Rock slide created a dam and the water broke out and killed 7 people Kelly, Wyoming

79
Q

Vaoint Dam, Italy [1963]

A

Area of susceptible of land slide activity
what contributed to the landslide was
1. rock slipping
2.Limestone on top of a layer of clay
3. Heavy rain made clay slipper (well defined surface)
AFTERMATH: 3000 people died

80
Q

Yungay, Peru (1970)

A

this is an example of an avalanche (very rapid motion)
it was trigger by an Earthquake (7.7 M)
killed over 25000 people
92 people survived by climbing cemetery hill
(4 minutes to save themselves)

81
Q

Mudflows are more common

A

semi-arid environments ex southern California

82
Q

Earth flows or more common in

A

high precipitation

very slow compared to mudflows

Natural Disasters (3 decks)

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