Eeps week 3

The slide-past motions of strike slip faults occur in all but which of the following?

Where the Indian subcontinent touches Asia

The global occurrence of earthquakes reveals that:

they usually occur on the boundaries of plates.

Aftershocks are smaller than the main shock in an earthquake sequence.

true

At depths below 100 km, subduction zone earthquakes occur almost exclusively in the interior of the subducting oceanic lithosphere

true

P and S waves do not follow simple paths as they pass through Earth; they speed up, slow down, and change direction, and S waves even disappear when they reach Earth's core.

true

The biggest shaking event is called "the earthquake," the smaller ones before it are known as foreshocks, and the smaller ones after it are called aftershocks.

true

To describe the location in three-dimensional space of a deformed rock layer or a fault surface, geologists make measurements known as dip and strike.

true

Three basic classes of collisions include all but which of the following?

Continental plate versus mantle plate

Following the paths of P and S waves from Earth's surface inward, there is an initial increase in wave speed but then a marked slowing occurs at a depth of about 100 meters; this defines the top of the lithosphere.

False

Which statement is TRUE? a. Raleigh and Love waves are surface seismic waves. b. S-waves are compressional body waves; P-waves are shear body waves. c. Surface waves are the first to show up on a seismogram recording of a quake. d. Shallow-focus quakes do less damage than deep-focus quakes.

Raleigh and Love waves are surface seismic waves.

Which statement is TRUE? a. P, S, Love, and Raleigh are all body waves that pass through the Earth's interior. b. The hypocenter (focus) is the point on Earth's surface directly above the epicenter. c. Love waves travel faster than Raleigh waves d. S-waves travel twice as fast as P-waves.

The hypocenter (focus) is the point on Earth's surface directly above the epicenter.

Normal faulting occurs when the hanging wall moves upward relative to the footwall.

false

The biggest earthquake ever recorded instrumentally occurred on 22 May 1960 in southern Chile with a seismic moment magnitude of 9.8.

false

The point where a fault first ruptures underground is known as the epicenter.

false

Which statement is TRUE? Earthquakes in California are: a. the result of reverse faulting along the San Andreas Fault. b. the result of widening along the San Andreas Fault, which will eventually cause western California to sink into the ocean. c. always above magnitude 7.5 because the San Andreas is such a large fault. d. shallow and occur in the upper 15 km of crust.

shallow and occur in the upper 15 km of crust