Ch 12 Earthquakes

The actual location of an earthquake inside the Earth is called the _____________.

What kind of fault is pictured?

• normal

• reverse

• strike-slip

• my

If seismograph station A is 25 km, station B is 24 km, and station C is 21 km, which station will recieve seismic waves first?

• A

• B

• C

Most earthquakes occur along

• plate boundaries

• continental margins

• major rivers

• lines parallel with Earth's magnetic field

Which is a characteristic of P waves?

• They compress and then expand the rock in the direction the wave travels.

• They are generated near the surface and only compress the rock as they travel.

• They travel slower than other seismic waves.

• They displace the rock back and forth in a direction that is perpendicular to their travel direction.

• They cannot be recorded on seismographs.

What materials can S waves travel through?

• liquids only

• solids only

• both solids and liquids

The greater the gap is between the arrival of P and S waves the ____________ a location is from the epicenter

• closer

• further

You need data from a minimum of ________ seismograph stations to locate the epicenter of an earthquake.

• 1

• 2

• 3

• 4

Prehistoric earthquakes may be studied by:

• digging trenches along a fault in order to map the offset of layers of sediment and soil to provide a timeline for interpreting when the fault moved

• ausing seismic recording stations to gather data about P-waves, S-waves, and surface waves so that earthquake magnitude can be determined

• looking at seismograms in order to measure P-S time to determine the epicenter of the earthquake

• using satellite data to create an interferogram and show how Earth deformed near the fault rupture

If a P wave increases velocity with depth, this means

• rocks are decreasing in density with depth

• rocks are increasing in density with depth

• rocks do not change in density

• P waves cannot travel through molten material