Earthquake Engineering, Unit-1

The elastic rebound theory:

• explains folding of rocks.

• explains the behavior of seismic waves.

• explains the origins of earthquakes.

• none of these.

The point within the Earth where seismic waves originate is

• the epicenter

• the fault scarp

• the origin

• the focus

P-waves are:

• transverse surface waves.

• compressional body waves

• tensional surface waves.

• shearing body waves

The minimum number of seismic stations needed to locate an earthquake is:

• 8

• 2

• 3

• 1

The Richter Scale is used to determine:

• intensity of earthquakes

• the magnitude of earthquakes.

• the damage from earthquakes

• the number of casualties in an earthquake.

Most earthquakes at divergent plate boundaries are:

• shallow focus

• intermediate focus

• deep focus

• all of these.

The fastest seismic waves are:

• P-waves

• S-waves

• Love Waves

• Rayleigh Waves

Analyses of seismograph records cannot provide information on

• the magnitude of the earthquake

• the location of the earthquake.

• the number of fatalities in an earthquake

• the depth of the earthquake.

The process of fluidizing water-saturated soil during an earthquake is known as:

• liquefaction.

• quick sand

• gelatinization.

• none of these.

Among the secondary effects of large earthquakes are

• tsunamis

• Fires

• landslides.

• all of these