1 Earthquake and Volcanic Hazards

Question 1

Earthquakes can strike any location at any time, but history shows they occur in the same general patterns year after year, principally in three large zones of the earth:

Answer 1

CIRCUM-PACIFIC SEISMIC BELT
ALPIDE EARTHQUAKE BELT
MID-ATLANTIC RIDGE

Question 2

is a natural phenomenon that is characterized by a sudden, violent shifting of massive plates underneath the earth’s surface

Answer 2

earthquake

Question 3

Found along the rim of the Pacific Ocean, where about 81% of our planet’s largest earthquakes occur.
The belt exists along boundaries of tectonic plates.

Answer 3

CIRCUM-PACIFIC SEISMIC BELT/
RING OF FIRE

Question 4

The belt accounts for about 17% of the world’s largest earthquakes.
Extends from java to Sumatra through the Himalayas, the Mediterranean, and into the Atlantic.

Answer 4

ALPIDE EARTHQUAKE BELT

Question 5

Located along the floor of the Atlantic Ocean.
Houses the longest mountain range in the world.
Most of **** is deep underwater and far from human development.

Answer 5

MID-ATLANTIC RIDGE

Question 6

(circum-pacific belt)
Earthquakes in these subduction zones are caused by ____________

Answer 6

slip between plates.

Question 7

is the place inside Earth’s crust where an earthquake originates.

Answer 7

focus/hypocenter

Question 8

The point on the Earth’s surface directly above the focus is the ________

Answer 8

epicenter

Question 9

closer to the surface where rocks are stronger and could build up greater strain

unaccompanied by volcanic activity

caused by scraping of mature plates

has friction

san andreas fault

Answer 9

Shallow focus earthquakes

Question 10

two types of earthquake

Answer 10

volcanic
tectonic

Question 11

are produced by sudden movement along faults and plate boundaries.

Answer 11

Tectonic earthquakes

Question 12

Earthquakes induced by rising lava or magma beneath active volcanoes is called __________________.

Answer 12

volcanic earthquakes

Question 13

elastic wave generated by an impulse

may travel either along or near the earth’s surface or through the earth’s interior.

radiates from the focus of an earthquake

Answer 13

SEISMIC WAVE

Question 14

an instrument used to detect and record seismic waves caused by earthquakes

Answer 14

seismograph

Question 15

2 types of body waves

Answer 15

s waves
p waves

Question 16

2 types of surface waves

Answer 16

love waves
rayleigh waves

Question 17

2 types of seismic waves

Answer 17

surface
body

Question 18

these waves can travel through the interior of the earth from the focus to distant points on the surface

Answer 18

body waves

Question 19

(waves)
travel the fastest
can move through all states of matter
primary
logitudinal

Answer 19

P waves

Question 20

(waves)
can only travel through solid materials
shake the ground perpendicularly casuing more damage
secondary
transverse

Answer 20

S waves

Question 21

these waves can only travel along the surface
confined to the outer layers of the earth

Answer 21

surface waves

Question 22

(waves)
move transverse to the direction of the propagation but with no vertical motion
cause rocks to move horizontally or side to side at right angles
cause the most damage

Answer 22

Love waves

Question 23

(waves)
cause rock particles to move upward, up, backward, and down in a path that contains the direction of the wave travel.

Answer 23

Rayleigh waves/ ground roll

Question 24

earthquakes that precede larger earthquakes in the same location.
a larger earthquake comes after it at the same location.

Answer 24

foreshock

Question 25

are smaller earthquakes that occur in the same general area during the days to years following a larger event or “mainshock

Answer 25

aftershock

Question 26

size of an earthquake

Answer 26

magnitude

Question 27

severity of an earthquake

Answer 27

intensity

Question 28

Are phenomena arising from volcanic activity that pose potential threat to people or property.

Answer 28

Volcanic Hazards

Question 29

8 common volcanic hazards in Philippine active volcanoes:

Answer 29

Pyroclastic Flow
Lava Flow
Ashfall
Lahar
Volcanic Gases
Secondary Explosion
Debris Avalanche or Volcanic Landslide
Tsunami or Seiche

Question 30

Are phenomena that arising from earthquakes activity that pose potential threat to people or property.

Answer 30

Earthquake Hazards