What is the epicenter of an earthquake?

the point on earth's surface directly above the focus

To locate the epicenter of earthquakes, scientists use computers to

perform triangulations based on data from seismographs

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

seismic gaps, rock changes, foreshocks

What is elastic rebound?

the sudden return of deformed rock to its undeformed shape

Volcanic eruptions may be signaled by

a change in earthquake activity

What causes tsunamis?

undersea earthquakes, landslides, volcanic eruptions

What is lag time (aka separation time)?

the difference in arrival time of p & s seismic waves

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

22 termsStudBud Administration314 plays

earth science volcanoes & earthquakes

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Questions 22

Answers

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

Unit 5 Hazards 2020 Flashcards | StudBud