To locate the epicenter of earthquakes, scientists use computers to

perform triangulations based on data from seismographs

What is the epicenter of an earthquake?

the point on earth's surface directly above the focus

What is elastic rebound?

the sudden return of deformed rock to its undeformed shape

Which of the following do scientists study in their efforts to forecast earthquakes?

seismic gaps, rock changes, foreshocks

Volcanic eruptions may be signaled by

a change in earthquake activity

What is lag time (aka separation time)?

the difference in arrival time of p & s seismic waves

What causes tsunamis?

undersea earthquakes, landslides, volcanic eruptions

S-waves that travel from an EQ towards earth's center will

Be absorbed by Earth's liquid outer core

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Unit 5 Hazards 2020

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earth science volcanoes & earthquakes

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Questions 22

Answers

1
To locate the epicenter of earthquakes, scientists use computers to
perform triangulations based on data from seismographs
determine magnitude and intensity
analyze hypotheses and theories
detect vibrations
2
Where does the first motion of an earthquake occur?
focus
fault
epicenter
locus
3
An area of volcanic activity far from a tectonic plate boundary is called a:
island arc
hot spot
cone
mantle plume
4
What happens to tsunamis as they move toward shore?
they die out
they turn into riptides
they decrease in height
they increase in height
5
Which of the following areas is both a major earthquake zone and a major volcanic zone?
Oceanic Ring of Fire
Pacific Ring of Fire
Pacific Island Arc
Pacific Ring of Volcanoes
6
What is the epicenter of an earthquake?
a seismic wave that travels along earth's surface
the last place that motion in an earthquake is detected
the location along a fault where the first motion occurs
the point on earth's surface directly above the focus
7
What is elastic rebound?
the gradual return of undeformed rock to its deformed shape
the sudden return of deformed rock to its undeformed shape
the sudden return of undeformed rock to its deformed shape
the gradual return of deformed rock to its undeformed shape
8
Which of the following do scientists study in their efforts to forecast earthquakes?
seismic gaps, rock changes, foreshocks
barometric pressure, rock alignment, prevailing winds
bird migration, animal behavior patterns, human behavior
the solar system, air testing, rock samples
9
Scientists have learned about the Earth's interior by studying
moonquakes
earth's seismic data
earth's surface features
the moon's composition
10
Volcanic eruptions may be signaled by
a change in earthquake activity
a change in wildlife behavior
a sudden weather change
volcanic dust in the air
11
What is lag time (aka separation time)?
The time at which the s-wave arrives at a seismic station
the predicted time the aftershock will occur
the difference in arrival time of p & s seismic waves
The predicted time between an EQ's foreshock and aftershock
12
What causes tsunamis?
changes in the ozone layer, world climate change, glaciers
undersea earthquakes, landslides, volcanic eruptions
tornadoes, volcanic eruptions, landslides
magnetic pole shifts, seismic gaps, extreme tides
13
If you are indoors during an earthquake, you should
crouch under a desk
stand on a desk
get outdoors fast
stand near windows
14
Which of the following is true of earthquake prediction?
it is not important
it is unreliable
scientists do not attempt it
it is impossible
15
A foreshock is
a major earthquake
a precursor to a tsunami
another name for seismic gap
a small earthquake
16
Which seismic wave travels the fastest?
radio waves
s-wave
p-wave
surface waves
17
What are food, water, flashlights, and a portable radio needed for?
measuring surface waves
finding shadow zones
predicting earthquakes
preparing for earthquakes
18
S-waves that travel from an EQ towards earth's center will
Be absorbed by Earth's liquid outer core
be absorbed by Earth's magnetic field
Be deflected by earth's solid inner core
be deflected by Earth's magnetic field
19
A large circular depression that forms when the magma chamber empties, causing ground to sink:
cone
crater
crust
caldera
20
When the temperature of rock rises above its melting point,
the melting point will decrease
the melting point will increase
magma will form
magma will not form
21
How many seismic stations are required to triangulate the location of an EQ's epicenter?
one
two
three
four
22
Which of the following is NOT a major volcanic area?
boundaries of tectonic plates
mid-ocean ridges
subduction zones
central continental plains

Unit 5 Hazards 2020 Flashcards | StudBud