Offset

A measure of the total energy expended during an earthquake; depends on its seismic moment determined by: rock shear strength, area of rock, average slip distance offset across the

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Question
A measure of the total energy expended during an earthquake; depends on its seismic moment determined by: rock shear strength, area of rock, average slip distance offset across the
Answer
Moment Magnitude

100 MCQs About Natural Disasters

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1. Which disaster are most likely to extinguish the human race? – Volcanoes and extraterrestrial impacts
2. What’s the smallest asteroid or comet that could cause devastating effects for humanity? – 1 kilometer wide – the equivalent of about a 10-minute walk
3. What is the biggest coronal mass ejections (CME) on record to hit Earth? – The arrington Event
4. What is the chance that a Carrington-like storm will hit in the next ten years? – 12 %
5. Which of these events may have been responsible for nearly wiping out the human race? – A supervolcano
6. How far does a supervolcano’s incineration zone extend? – 100 Kilometers
7. Where is the world’s biggest earthquake machine located? – Miki, Japan
8. What, according to some scientists, is the ideal post apocalyptic food? – Mushrooms
9. At No. 1 on the list, _____ are the most common natural disaster. – Floods
10. Landslides, tsunamis and avalanches can all be caused by what other natural disaster? –Earthquakes
11. Which volcanic feature is the deadliest? – The flow of ash, rock and gasses moving down a volcano’s side
12. The deadliest natural disaster in U.S. history was a _____ that hit Galveston, TX in 1900, killing about 7,000 people. – Hurricane
13. What makes a tornado dark colored? – The dirt and debris it sucks up
14. One of America’s worst natural disasters occurred in 1980, when a _____ damaged much
of the southern U.S. – Heat Wave
15. Below average rainfall for a prolonged period of time is called – Drought
16. What is a Tsunami? – A large wave usually formed by undersea earthquakes and landslides.
17. A sudden movement in the earth’s crust caused by movements of tectonic plates is called? – An earthquake
18. What is a natural disaster? – When a natural hazard impacts on the community causing destruction of property and loss of life.
19. The phenomenon of unusually cool ocean currents off the coast of Australia is called – El Nino
20. The social impacts of natural hazards include: – Loss of income to people or damage to an industry, illnesses cause by hazard, no form of communication
21. Natural Hazards can be separated into _________ and ________ categories. – Economic Impacts and Environmental Impacts
22. Indicates the severity of an earthquake in terms of the damage that it inflicts on structures and people – Intensity Scale
23. Boundary where plates are moving towards each other – Convergent
24. A fan shaped deposit of sand and gravel at the mouth of a mountain canyon where the stream gradient flattens at main valley floor – Alluvial Fan
25. A ground depression caused by collapse into an underground cavern – Sinkhole
26. Volcanic dome composed of rhyolite and rhyodacite – Rhyolite Dome
27. Form as sediment is deposited in the slower waters on the inside of the meander bends – Point bar
28. The number peaks per second – Frequency
29. Record local and very strong earthquakes – Strong-motion Seismograph
30. A measure of the total energy expended during an earthquake; depends on its seismic moment determined by: rock shear strength, area of rock, average slip distance offset across the – Moment Magnitude
31. A landslide in which the mass rotates as it slides on a basal slip surface – Rotational Slide
32. Blocky basalt lava with a ragged clinkery surface – Aa Flow
33. Karst-like landscape in permafrost terrain caused by melting of thermofrost under increasing temperatures – Thermokarst
34. Flat-topped volcano formed by an eruption under a glacier – Tuya
35. Molten rock – Magma
36. Record both local and distant earthquakes; but cannot accurately measure strong earthquakes in the direct vicinity – Broadband Seismograph
37. A slurry of rock, sand, water flowing downslope; water usually makes up less than half of the flow volume –Debris Flow
38. Ice that crystallizes in pores between grains of sediment – Interstitial Ice
39. Developed 1953l based on maximum amplitude of earthquake waves recorded on a Wood Anderson Seismograph – Richter Magnitude Scale
40. The total area inundated by the tsunami – Run-out distance
41. The height to which a tsunami wave rushes up onshore – Run-up height
42. Rigid outer rind of Earth approximately 60-100km thick – Lithosphere
43. Maximum angle of which sediment particles can stand without falling (dependent on grain size, grain angularity, moisture content) – Critical Angle of Repose
44. Heavier sediment in a stream that is moved along the stream bed rather than in suspension – Bedload
45. Energy level between Richter Scale Units differs by ______ times – 31.5
46. A flow of mud, rock, and water dominated by clay-sized particles – Mud Flow
47. Rapid movement of land, ranging from cm/hr to m/s of material disappearing almost instantaneously – Collapse
48. Relatively flat lowland that borders a river usually dry but subject to flooding – Floodplain
49. Water saturated sediment jostled by an earthquake rearrange themselves into a closer packing arragement – Liquefaction
50. Where the earthquake actually happens in the earth’s crust, where energy is radiating out from all directions – Focus
51. A circular or oval feature resulting from the dissolution of rock – Doline
52. Natural & Human Created Hazard like floods, droughts, wildland fires, weather phenomena, landslides are called – Hydrometeorological Hazards
53. Type of collision forms continent volcanic arc of stratovolcanoes – Ocean-Continent
54. Basalt lava with a ropy or smooth top – Pahoehoe Flow
55. Magma that flows out onto the ground surface – Lava
56. Fragmental material blown out of a volcano (ex. tephra, cinders, and bombs) – Pyroclastic
57. A particle of volcanic ash between 2mm and 6mm across – Lapilli
58. Type of collision that forms oceanic island arc of basaltic volcanoes – Ocean-Ocean
59. Point where boundaries of 3 plates meet – Triple Junction
60. Natural Hazards like Earthquakes, Tsunami, Volcanic Eruptions, Asteroid/Comet Impacts, Landslides are called – Geophysical Hazard
61. Rapid discharge of water from an ice-dammed lake, typically resulting from a volcanic eruption – Jokulhlaup
62. Tsunami that strikes area adjacent to its point of origin – Near Field Tsunami
63. A broad expanse of basalt lava that cooled to fill in low-lying areas of the landscape – Flood Basalt
64. An extremely large basalt-lava volcano, gently sloping sides – Shield Volcano
65. Where the earthquake actually appears on the earth’s surface, sometimes there is a rupture at that point – Epicentre
66. Downslope creep driven by sequential freezing and thawing – Gelifluction
67. A huge collapse depression at the Earth’s surface that sank into a near-surface magma chamber during eruption of the magma – Resurgent Caldera
68. The length of a fault broken during an earthquake – Surface Rupture Length
69. Developed in 1902 by Giuseppe Mercalli – Mercalli Intensity Scale
70. Measure earthquakes quantitatively, independent of location and assigns a magnitude value based on energy released – Magnitude Scale
71. Involves the movement of a slab of rock, debris, or cohesive mud as a single unit – Slide
72. The time between seismic waves – Period
73. Extremely rapid downslope movement of large volumes of rock and debris – Sturzstrom
74. Secondary/Shear waves that shake back and forth perpendicular to the direction of wave travel, cannot travel through a liquid (4.5km/s upper mantle, 3.5km/s crust) – S Wave
75. Used to measure earthquakes – Seismograph
76. The potential degree to which an individual or community could be affected by a natural hazard – Sensitivity
77. Records distant earthquakes – Long-period Seismograph
78. A river characterized by multiple, frequency shifting channels – Braided River
79. An ice jam initiated by rpaid change in temperature – Thermal Ice Jam
80. Extremely slow downslope flow of sediment on the surface – Creep
81. Slope of the river channel; typically decreases downstream – Gradient
82. A mudflow associated with volcanic action or involving volcanic materials – Lahar
83. Component of stress perpendicular to the earth’s planar surface (force keeping the boulder/grain from moving) – Normal Stress
84. A flow involving movement of broken rock, with little sand or mud, and particle-particle contact; usually developed in gravel or sand – Grain Flow
85. A mass of cold, solid rock ejected from a volcano – Block
86. Fine materials (dust, ash, and cinders) produced by volcanic action – Tephra
87. An elevation that a stream cannot erode past, controlled by level of the body of water which the stream discharges into – Base Level
88. A landslide that moves along a regular sloping planar surface – Translational Slide
89. Mineral composed of potassium chloride, a salt used in manufacturing fertilizer – Sylvite
90. Mineral or rock composed of sodium chloride; susceptible to dissolution – Halite
91. An event involving a significant number of people and/or significant economic damage – Disaster
92. The deepest parts of the channel along the length of the stream bed – Thalweg
93. Lenses of pure ice developed in permafrost sediment – Segregated Ice
94. An abnormally long wavelength wave produced by sudden displacement of water – Tsunami
95. Topographic line or boundary separating watersheds – Drainage Divide
96. Formed on the ceiling of a cavern when water percolates through fractures in limestone – Stalactite
97. A large steep-sided volcano consisting of layers of ash, fragmental debris and lava – Stratovolcanoes
98. The amount the fault or ridge moves away from its point of origin (aka displacement) – Offset
99. A mass of liquid of partially solidified rock that is ejected from a volcano – Bomb
100. Relatively slow movement of land, typically at rates of cm/yr – Subsidence

 

General Science & Ability MCQs (Natural Hazards and Disasters, Set-I)

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1) What is the point of origin of an earthquake?
(a) Epicenter
(b) Focus
(c) Foreshock
(d) Scarp
(e) Seismograph
Answer: (b)
The exact point where the earthquake actually starts deep inside the earth’s crust (the point of origin) is called the focus, or hypocenter.

2) What is the point on the surface nearest the earthquake?
(a) Epicenter
(b) Focus
(c) Foreshock
(d) Scarp
(e) Seismograph
Answer: (a)
The epicenter is the point on the earth’s surface vertically above the hypocenter (or focus), point in the crust where a seismic rupture begins

3) Places experiencing equal impact of an earthquake are called (CSS-2012)
(a) Snowlines
(b) seismic belts
(c) Seismic lines
(d) None of these
Answer: (c)

4) Where do most earthquakes occur?
(a) Along dikes
(b) Along faults
(c) Along folds
(d) Along joints
(e) Along unconformities
Answer: (b)
Earthquakes can also occur far from the edges of plates, along faults. Faults are cracks in the earth where sections of a plate (or two plates) are moving in different directions. Faults are caused by all that bumping and sliding the plates do. They are more common near the edges of the plates.

5) What is the standardized distance from an earthquake epicenter for measuring Richter magnitudes?
(a) 0 km
(b) 10 km
(c) 100 km
(d) 500 km
(e) 1000 km
Answer: (c)
Richter established 100 km as the standard distance from an earthquake epicenter to measure Richter magnitude with a Wood-Anderson seismograph.

6) What was the magnitude of the Earthquake that shook Northern Pakistan and Azad Kashmir on October, 8, 2005? (CSS-2006)
(a) 5.7
(b) 7.5
(c) 7.6
(d) None of these.
Answer: (d)
A major earthquake shook Pakistan on Saturday, October 8, 2005, at 8:50 a.m. The epicenter of this magnitude 7.6 quake was about 65 miles north-northeast of Islamabad, the country’s capital. At least 86,000 people were killed, more than 69,000 were injured, and extensive damage resulted in northern Pakistan. The heaviest damage occurred in the Muzaffarabad area of Kashmir.

7) In what country did the highest magnitude earthquake ever measured take place?
(a) Chile
(b) Pakistan
(c) Japan
(d) Afghanistan
(e) United States
Answer: (a)
The Chilean earthquake of 1960 is the most powerful ever recorded at 8.6 on the Richter scale or 9.5 on the moment magnitude scale.

8) What is the immediate energy source for earthquakes?
(a) Stored elastic energy in bent rock
(b) Stored elastic energy in compressed rock
(c) Stored heat energy from the earth’s interior
(d) Stored heat energy from the sun
Answer: (a)
Sudden elastic rebound of bent rock that has reached the breaking point is what causes nearly all earthquakes

9) What is the strongest magnitude earthquake ever measured on the Richter scale?
(a) 5.5
(b) 6.3
(c) 6.8
(d) 7.5
(e) 8.6
Answer: (e)
Several earthquakes have been measured with a magnitude close to 8.6 on the Richter scale, but none higher.

10) Which region of the earth has the most frequent earthquakes?
(a) Antarctic region
(b) Arctic region
(c) Atlantic region
(d) Indian region
(e) Pacific region
Answer: (e)
The Pacific region has the greatest number of earthquakes because this is where most of the earth’s convergent plate boundaries lie.

11) Japan is called: (CSS-2008)
(a) Land of earthquakes
(b) Land of rising sun
(c) Land of rivers
(d) None of these
Answer: (b)

12) How does shaking ground cause soft sediment to liquify?
(a) It breaks the sediment particles into smaller pieces
(b) It evaporates water in the pores of the sediment
(c) It makes sediment particles fit more tightly together
(d) It melts the sediment
(e) It melts water in the pores of the sediment
Answer: (c)
Shaking ground helps particles to settle more tightly together, thus reducing interstitial space and releasing pore water.

13) Which of the following is not associated with earthquake destruction?
(a) Fires
(b) High winds
(c) Mass wasting
(d) Trembling earth
(e) Tsunamis
Answer: (b)
Earthquakes do not generate high winds.

14) Pakistan/Kashmir earthquake of October, 2005 was result of: (CSS-2006)
(a) Volcanic activity
(b) Tectonic dislocation
(c) Severe flooding
(d) None of these
Answer: (b)

15) Which waves are called shear waves because of the shear forces that they subject the rock to?
(a) P-waves
(b) S-waves
(c) Surface waves
(d) All of the above
Answer: (b)
S-waves are also called shear waves because they subject the medium to shear forces, and they only pass through solids because only solids have elastic rebound to shear forces.

16) Which waves are called compression waves because they compress and extend the material they pass through?
(a) P-waves
(b) S-waves
(c) Surface waves
(d) All of the above
Answer: (a)
P-waves are also called compression waves because they compress and extend the medium.

17) In what order do earthquake waves arrive at seismic stations?
(a) P-waves, then S-waves, then surface waves
(a) S-waves, then P-waves, then surface waves
(b) S-waves, then surface waves, then P-waves
(c) Surface waves, then P-waves, then S-waves
(d) Surface waves, then S-waves, then P-waves
Answer: (a)
Primary and secondary waves are named after their arrival sequence.

18) Which of the following earthquake waves is first recorded on the Seismograph?
(a) P-waves
(b) Rayleigh waves
(c) S-waves
(d) Love waves
Answer: (a)

19) The Intensity scale of the earthquake is called?
(a) Mercalli scale
(b) Ritcher scale
(c) Number scale
(d) None of the above
Answer: (a)

20) The point where the energy is released during the earthquake is called?
(a) Epicentre
(b) Hypocentre
(c) Circumcentre
(d) None of the above
Answer: (b)

21) The type of plate- boundary interaction along the Himalayas is known as?
(a) Continent-continent convergence
(b) Divergent boundary
(c) Transform boundary
(d) Ocean-continent convergence
Answer: (a)

22) Which of the following describes the build up and release of stress during an earthquake?
(a) the Modified Mercalli Scale
(b) the elastic rebound theory
(c) the principle of superposition
(d) the travel time difference
Answer: (b)

23) Approximately what percentage of earthquakes occur at plate boundaries?
(a) 25%
(b) 50%
(c) 75%
(d) 90%
Answer: (d)

24) Where is the focus with respect to the epicenter?
(a) directly below the epicenter
(b) directly above the epicenter
(c) in the P wave shadow zone
(d) in the S wave shadow zone
Answer: (b)

25) Point A, where slip initiated during the earthquake, is called the ________.
(a) dip
(b) epicenter
(c) focus
(d) scarp
Answer: (c)

26) Point B is called the earthquake ________.
(a) dip
(b) epicenter
(c) focus
(d) scarp
Answer: (b)

27) Point C is called the _________
(a) epicenter
(b) fault scarp
(c) Seismic wave
(d) Dip of the earthquake
Answer: (b)
A fault scarp is a small step or offset on the ground surface where one side of a fault has moved vertically with respect to the other. It is the topographic expression of faulting attributed to the displacement of the land surface by movement along faults.

28) What type of faulting is illustrated in this diagram?
(a) normal (b) Reverse
(c) Thrust (d) Abnormal
Answer: (a)

29) Which one of the following earthquake waves is more destructive?
(a) P-waves
(b) Surface waves
(c) S-waves
(d) Body waves
Answer: (b)
Earthquake waves can be divided into two types – body waves and surface waves. There are two types of body waves – P-wave and S-wave. The surface waves are more destructive as they displace rocks, and hence results in collapse of structures.

30) When a volcano ejects acid lava, eruption is usually
(a) Light and less violent
(b) Soft and less violent
(c) Loud but less violent
(d) Loud and more violent
Answer: (d)

31) In some eruptions, mudflows are forced over the
(a) Earth’s mantle
(b) Ocean bed
(c) Earth’s surface
(d) Earth’s core
Answer: (c)

32) Magma which is forced onto Earth’s surface is known as
(a) Vent
(b) Cone
(c) Lava
(d) Magma Chamber
Answer: (c)

33) An example of composite volcanoes is
(a) Mount Everest
(b) Puy de Dôme
(c) Mauna Loa
(d) Mount Merapi
Answer: (d)

34) ‘Flash-floods’ are associated with
(a) Thunderstorms
(b) Cyclonic storms
(c) Tsunami
(d) Tornado
Answer: (a)
A flash flood is a sudden flood event caused by a hydrologic response of the drainage basin. Flash floods are normally strongly localized and associated with extreme showers or thunderstorm activity, when high rates of precipitation occur in a short period of time.

35) During eruption, volcanic material is
(a) Blown to some meters
(b) Blown to many kilometers
(c) Blown to some inches
(d) Blown to some feet
Answer: (b)

36) When volcanos ejects basic lava, eruption is mainly
(a) Loud
(b) Violent
(c) Quite
(d) Hard
Answer: (c)

37) A reference to process by which materials such as magma and gases from inside Earth are forced onto Earth’s surface is
(a) Eruption
(b) Lava
(c) Volcanism
(d) Earthquake
Answer: (c)

38) Movement of crustal plates result in formation of
(a) a huge island
(b) Small volcanic islands
(c) a small island
(d) Huge volcanic islands
Answer: (b)

39) Ice can be changed to water by: (CSS-2011)
(a) Adding more water molecules
(b) Changing the motion of the water molecules
(c) Rearranging the atoms in water molecules
(d) Destroying the atoms in water molecules
(e) None of these
Answer: (b)

40) Composite volcanoes are made up of alternate layers of
(a) Ash and cinder only
(b) Dense lava and ash
(c) Viscous lava, ash and cinder
(d) pyroclastic lava, ash and cinder
Answer: (c)

41) Lava that contains high amounts of iron and magnesium, but low amount of silica is known as
(a) Acid Lava
(b) Basic Lava
(c) Composite Lava
(d) Component Lava
Answer: (b)

42) Number of classifications of volcanoes is
(a) three
(b) Six
(c) nine
(d) twelve
Answer: (a)

43) Acid lava is sticky or ‘viscous’ because it contains high amounts of
(a) Copper
(b) Iron
(c) nickel
(d) Silica
Answer: (d)

44) Eruptions from composite volcanoes are usually
(a) Light and less violent
(b) Soft and less violent
(c) Loud but less violent
(d) Loud and more violent
Answer: (d)

45) As volcano is carried along by plate, a new volcano is formed over the
(a) Ocean bed
(b) River bed
(c) Original hot spot
(d) Virtual hot spot
Answer: (c)

46) Cavity in Earth’s crust below vent that holds magma is known as
(a) Vent
(b) Cone
(c) Lava
(d) Magma Chamber
Answer: (d)

47) Most common type of volcano is the
(a) Acid Lava Volcano
(b) Basic Lava Volcano
(c) Composite Lava Volcano
(d) Component Volcano
Answer: (c)

48) Composite Lava Volcano is also known as
(a) Cinder volcano
(b) Ash volcano
(c) Pyroclastic volcano
(d) Stratovolcanoes
Answer: (d)
Composite volcanoes (also called stratovolcanoes) are much more explosive than shield volcanoes, the other important type of volcano.

49) Mid-Atlantic ridge is so tall that it actually rises above sea in many places forming
(a) Icy islands
(b) Ice lands
(c) Volcanic islands
(d) Rocky islands
Answer: (c)

50) Basic lava erupts out of volcano, throwing out mainly
(a) Ash
(b) Dust
(c) CO
(d) CO2
Answer: (a)