A) How long did ground motion last during the Alaska 1964 earthquake? B) What ca
ID: 1026 • Letter: A
Question
A) How long did ground motion last during the Alaska 1964 earthquake? B) What caused the death of most of the 131 lost during that earthquake? How far was the Mexico City from the actual epicenter of the earthquake that destroyed so many buildings in the city? What are the two lines of evidence for a large earthquake in the Pacific Northwest in about 1700? A) Discuss at least 3 reasons why building collapse was extensive in the Marina District. B) What is a seismic gap? C) Is San Francisco on a seismic gap? A) What was the magnitude of the Japan 2011 earthquake? B) Over how large of an area did the rupture occur? C) How much slip along the fault occurred? Chapter 5 A) The Puget Sound earthquake in 2001 was 6.8 magnitude and lasted for 45 seconds yet not much damage and no loss of life occurred. What are at least two reasons for this? B) What is the plate tectonic setting of Puget Sound? What is the tectonic reason for the occurrence of 6 and 7 magnitude earthquakes in Nevada? What caused the Hebgen Lake landslide? A) Which segment of the Wasatch fault is the most likely for a large magnitude earthquake? Why? B) What is the recurrence interval for 6.5 or larger earthquakes along the Wasatch fault? C) Is the Wasatch fault a normal, reverse or strike slip fault? When did the Reelfoot rift form (ages in years)? A) What was the magnitude of the Charleston, South Carolina earthquake? B) How often do quakes occur in this region? What causes earthquakes in Hawaii? Thought Question If you were terrified of earthquakes and wanted to live in a state with the lowest possible potential for an earthquake which states could you choose from?
Explanation / Answer
a)The 1964 Alaskan earthquake, also known as the Great Alaskan Earthquake and Good Friday Earthquake, was a megathrust earthquake that began at 5:36 P.M. AST on Good Friday, March 27, 1964.[2] Across south-central Alaska, ground fissures, collapsing structures, and tsunamis resulting from the earthquake caused about 139 deaths
B)The number of deaths from the earthquake totalled 131; 115 in Alaska and 16 in Oregon and California. The death toll was extrememly small for a quake of this magnitude due to low population density, the time of day and the fact that it was a holiday, and the type of material used to construct many buildings (wood).
The 1985 Mexico City earthquake was a magnitude 8.1 earthquake that struck some states of Mexico and Mexico City on the early morning of 19 September 1985 at around 7:19 am (CST), caused the deaths of at least 10,000 people and serious damage to the Greater Mexico City Area. The complete seismic event consisted of four quakes. A pre-event quake of magnitude 5.2 occurred on 28 May 1985. The main and most powerful shock occurred 19 September, followed by two aftershocks: one on 20 September 1985 of magnitude 7.5 and the fourth occurring seven months later on 30 April 1986 of magnitude 7.0. The quakes were located off the Mexican Pacific coast, more than 350 kilometres (220 mi) away, but due to strength of the quake and the fact that Mexico City sits on an old lakebed, Mexico City suffered major damage. The event caused between three and four billion USD in damage as 412 buildings collapsed and another 3,124 were seriously damaged in the city. While the number is in dispute, the most-often cited number of deaths is an estimated 10,000 people but experts agreed that it could be up to 40,000.
The earthquake occurred in the Pacific Ocean, off the coast of the Mexican state of Michoac