COR 11 Disaster Readiness & Risk Reduction

This refers to the number of repetitions of shaking within a specified period of time.

• frequency

• seismic waves

• intensity

How are low frequency waves felt in skyscrapers?

• Tall building won’t be felt in with low frequency seismic waves.

• Tall buildings do not move.

• Tall buildings sway more.

Which intensify the damage from ground shaking?

• soft underlying rock/soil

• abiding by the building code

• building your house on basaltic rock

You have just found out that the land you were planning to build your house on is underlain by alluvium. Alluvium is loose, unconsolidated sediments that have been redeposited in a non-marine setting. What can you do to reduce the effects of ground shaking should an earthquake occur?

• Construct as many floors/storeys as possible.

• Limit the number of floors of your house to just two.

• Relocate.

What causes earthquake-induced ground ruptures?

• faults

• Rayleigh waves

• poor infrastructure

Picture a line of trees along the right side of a road. You notice that the last five trees you passed by are farther away from the road than the ones up ahead. Could they have been moved by a dextral fault?

• No. The trees were displaced by a left-lateral fault.

• Yes. If you are in a car and facing the trees, you can see that the sense of movement can only be that of a right-lateral fault.

• No. The misalignment had nothing to do with a fault.

• No. The displacement is obviously related to a dip-slip fault.

What process causes sediments to be compressed and fluids squeezed out from pore spaces?

• cementation

• compaction

• consolidation

The city of Manila is underlain by sand and silt. Which of the following is true in the event of an earthquake?

• The sand and silt will experience strong liquefaction.

• The sand and silt will undergo compaction and become indurated rock.

• The sand and silt might turn into liquid.

• The sand and silt will not cause any liquefaction in the area.

What will be produced by an earthquake caused by a fault traversing two cities?

• a local tsunami

• no tsunami

• a regional tsunami

Which of the following is true during an eruption of the Mayon Volcano?

• The whole Bicol region should prepare for a tsunami.

• Only communities near the volcano will likely experience a tsunami.

• There will be no tsunami threats in coasts near Mount Mayon.

• There will be small-scale tsunami near the coastal areas.