Geohazards

Question 1

The surfacial point directly above the focus of an earthquake.

Answer 1

Epicenter

Question 2

The slowest seismic wave.
a. P-wave
b. S-wave
c. Love Wave
d. Rayleigh Wave

Answer 2

Rayleigh Wave

Question 3

These minerals are found in the Transition Zone

Answer 3

Wadsleyite and Ringwoodite

Question 4

Which of the following is a Magnitude Scale?
a. Richter
b. Mercalli
c. PEIS

Answer 4

Richter

Question 5

The largest recorded earthquake

Answer 5

1960 Valdivia or Great Chilean Earthquake. M9.5

Question 6

MMIS description: Felt by all, many fightened. Some heavy equipment moved; a few instances of fallen plaster. Damage slight.
a. Intensity 3
b. Intensity 5
c. Intensity 6
d. Intensity 8

Answer 6

Intensity 6 Strong

Question 7

MMIS description: Felt by all, many fightened. Some heavy equipment moved; a few instances of fallen plaster. Damage slight.
a. Intensity 3
b. Intensity 5
c. Intensity 6
d. Intensity 8

Answer 7

Intensity 6 Strong

Question 8

MMIS Description: Felt indoors by many, outdoors by few during the day. At night, some awakened. Dishes, windows, doors disturbed; walls make cracking sound. Sensation like heavy truck striking building. Standing motor cars rocked noticeably.
a. Intensity 2
b. Intensity 4
c. Intensity 7
d. Intensity 3

Answer 8

Intensity 4 Light

Question 9

PEIS Description: Perceptible to people under favorable conditions. Delicately balanced objects are disturbed slightly. Still waters oscillate slowly.
a. Intensity 1
b. Intensity 2
c. Intensity 3
d. Intensity 4

Answer 9

Intensity 1 Scarcely Perceptible

Question 10

PEIS Description: Generally felt by most people indoors and outdoors. Many sleeping are awakened. Some are frightened, some run outdoors. Strong shaking and rocking felt throughout the building. Hanging objects swing violently.
a. Intensity 4
b. Intensity 5
c. Intensity 6
d. Intensity 8

Answer 10

Intensity 5 Strong

Question 11

The abnormal rise of sea level due to the approaching tropical cyclone’s strong winds approaching the coast, pushing the ocean water over the low-lying coastal areas.

Answer 11

Storm surge

Question 12

The following places in Mindanao are marked as liquefaction susceptible by PHIVOLCS except:
a. Cagayan de Oro
b. Isulan
c. Agusan del Sur
d. Panabo

Answer 12

Cagayan de Oro

Question 13

PHIVOLCS Tsunami Bulletin Evaluation: Sea level disturbances such as strong currents and rapid rise and fall of seawaters are expected. People are advised to stay away from the beach and not to go to the coast.
a. No Tsunami Threat
b. Sea-Level Change Monitoring
c. Tsunami Warning

Answer 13

Sea-Level Change Monitoring

Question 14

Which among the following scenarios can a storm surge be considered as expected?
a. 1 masl
b. 2.0 masl
c. 2.6 masl
d. 3.1 masl

Answer 14

2.1-3 masl

Question 15

A block of wire mesh containing gravel- to boulder-sized rock fragments that is used as landslide-control, especially on roadsides and riverbanks.

Answer 15

Gabion

Question 16

Application of concrete along vertical or overhead faces of rocks through spraying it along the faces to help the stabilization of fractured rocks.

Answer 16

Shotcrete

Question 17

A concrete or wooden reinforcement built along the shoreline that dissipates and reduces wave energy.

Answer 17

Revetment

Question 18

Fence-like structures built at right angles from the coastline to break up waves, reduce eroding energy, and help collect sediments along its walls.

Answer 18

Groin

Question 19

A long, narrow structures built at right angles from the shore that limits sediment input within the inlet.

Answer 19

Jetties

Question 20

Large chunks of rocks and debris that are ejected from a volcano.

Answer 20

Tephra

Question 21

A hot mixture of volcanic debris and tephra that is saturated with water.

Answer 21

Lahar