Earthquakes: Preparedness and Responses

The _______ ________ is used to measure the magnitude of an earthquake.

Deep-focus earthquake occurs between ____ and 700 kilometres below the earth's surface.

• 30

• 50

• 70

• 90

Shallow-focus earthquake occurs in the upper ____ kilometres of the earth's crust.

• 30

• 50

• 70

• 90

Apart from magnitude, the extent of damage caused by an earthquake may vary based on

• population density

• time of occurrence

• distance from the epicentre

• all of the options

The extent of damage caused by an earthquake may vary according to people and community's level of preparedness.

• True

• False

Earthquakes can occur at convergent, divergent and transform plate boundaries but occur most frequently at convergent plate boundaries.

• True

• False

A ________ records the seismic waves released by an earthquake.

• seismograph

• seismic waves

• seismology

• seismic action

__________ refers to an unusually large sea wave.

Tsunamis may be formed by

• movement of the seafloor during a large earthquake at the subduction zone

• an explosive underwater volcanic eruption

• landslide above sea level which causes materials to plunge into the water

• all of the options

Earthquakes may cause

• disruption of services

• landslides

• destruction of properties, infrastructure

• all of the option