Chapter 11

# Chapter 11 - Multiple-Choice Questions 1 The elastic...

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Multiple-Choice Questions 1) The elastic rebound theory for the origin of earthquakes was first proposed by __________ following the __________ earthquake. A) Reid; 1906, San Francisco B) Giuseppe; 1925, Pizza Lake C) Richter; 1989, Loma Prieta D) Mohorovicic; 1964, Anchorage Answer: A Diff: 1 2) Which one of the following statements concerning foci and epicenters is correct? A) The focus is the faulted point on the surface directly above the epicenter. B) The fault first cracks at the epicenter and breaks through to the surface at the focus. C) The epicenter is at the surface directly above the focus where the earthquake initiates. D) The earthquake starts at the focus and the rupture extends down to the epicenter. Answer: C Diff: 1 3) Which one of the following statements is correct? A) P waves travel through solids; S waves do not. B) P and S waves travel through liquids, but P waves do not travel through solids. C) S waves travel through solids and P waves travel through liquids. D) P and S waves travel through liquids, but S waves do not travel through solids. Answer: C Diff: 1 4) __________ have the highest velocities. A) Primary waves B) Secondary waves C) Surface waves D) Refracted S waves Answer: A Diff: 1 5) The __________ is a direct measure of the distance from a seismic receiving station to the focus of a distant earthquake. A) time interval between the first P and S- wave arrivals B) magnitude of the ground acceleration of surface wave passing a receiving station C) time elapsed between the first P-wave arrivals from the first and last aftershocks D) time interval between the first P-wave and the last surface wave Answer: A Diff: 1 6) Which one of the following is true regarding tsunamis?

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A) They travel as deep-water waves at speeds greater than surface seismic waves but slower than S waves. B) Their wave heights decrease and wavelengths increase as they move into shallower water. C) They are started by fault-induced, horizontal shifts in the sea floor that suddenly propel great masses of water in opposite directions. D) They occur in the open ocean, wavelengths are many miles or kilometers and wave heights are only a few feet. Answer: D Diff: 1 7) On a typical seismogram, __________ will show the highest amplitudes. A) P waves B) S waves C) surface waves D) body waves Answer: C Diff: 1 8) Which of the following foundation materials is most stable during earthquake shaking? A) bedrock B) unconsolidated moist soil C) water-saturate D) sand and mud Answer: A Diff: 1 9) The __________ magnitude scale is a measure of the energy released. It does not directly measure the extent of building damage. A) Gutenberg B) Reid C) Mercalli D) Richter Answer: D Diff: 1 10) Why was the Marina District, San Francisco, heavily damaged in the 1906 and 1989 quakes? A) The epicenters of both quakes were right under the district.
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## This note was uploaded on 07/16/2009 for the course GEOL 100 taught by Professor Johntrib during the Spring '09 term at Maastricht.

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Chapter 11 - Multiple-Choice Questions 1 The elastic...

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