Exam 7: Earthquakes and the Earths Structure

A/an __________ is a sudden motion or trembling of the Earth.

A type of continuous, snail-like rock movement that occurs along parts of the San Andreas Fault is called __________ __________.

When solid rock deforms and returns to its original shape, it has undergone:

The Mohorovicic discontinuity is the boundary between the outer and inner core.

P, or primary, waves:

A seismograph measures __________.

When rock retains its new shape (without fracturing) after stress has been removed, it has undergone __________ __________.

Earthquakes occur along the upper portion of a sinking plate in the __________ zone.

__________ __________ are body waves that move much more slowly than P waves.

The initial rupture point of an earthquake (below Earth's surface) is the __________.

__________ waves are elastic waves traveling through rock, produced by an earthquake.

Earthquakes occur primarily along plate boundaries because:

Moment magnitude most closely reflects the total amount of energy released during an earthquake.

Earthquakes never occur in plate interiors.

To measure the distance from a recording station to an earthquake epicenter, geologists evaluate the __________ with a time-travel curve.

The metallic core is composed of __________ and __________.

__________ waves are the fastest body waves generated by an earthquake.

A strike-slip fault is a __________ fault on which rocks on opposite sides move __________.

The Mercalli scale expresses the amount of energy released by an earthquake.

A seismogram records Earth vibrations.