Deadly earthquakes occur at transform plate boundaries, creating strike-slip faults, because they tend to have shallow focuses where the rupture occurs. 2nd grade. Earthquake in oceans is known as Tsunami, which is equally devastating. The 1906 San Francisco earthquake struck the coast of Northern California at 5:12 a.m. on Wednesday, April 18 with an estimated moment magnitude of 7.9 and a maximum Mercalli intensity of XI (Extreme).High-intensity shaking was felt from Eureka on the North Coast to the Salinas Valley, an agricultural region to the south of the San Francisco Bay Area. 5. B.Intensity refers to the effects that earthquakes have, magnitude refers to energy released. One of the ways a fault is created is when two different types of rocks butt up against each other. This means two fault blocks are moving past each other horizontally. You can determine the location of the epicenter of an earthquake by analyzing seismograph data from any single location. It looks like your browser needs an update. occurring on an individual fault in the San Francisco region is lower than the probabil- ity of an earthquake occurring anywhere in the region. The main causes of earthquakes fall into five categories: 1. B.Strike-slip faults from a transform plate boundary. For earthquakes with a similar magnitude, earthquakes at deep depths tend to cause more damage than shallow earthquakes. If you knew that an earthquake was coming, where is the safest place to be? Which seismic waves are the last to reach a seismograph station? In other areas where creep is NOT constant, strain can build up for hundreds of years, producing great earthquakes when it finally releases. 21 October 2015 1906 San Francisco Earthquake An earthquake is the vibration of the Earth produced by the rapid release of energy. Question: Quiz 3* October 1st 2020 What Causes Earthquakes In San Francisco? The earthquake was felt from southern Oregon to south of Los Angeles and inland as far as central Nevada. The great earthquake broke loose some 20 to 25 seconds later, with an epicenter near San Francisco. There are about 2,000 earthquakes of magnitude 8 or higher every year; fortunately most of them occur in unpopulated areas. The lowballing city figures may have been a public relations ploy to downplay the disaster with an eye on rebuilding the city. Violent shocks punctuated the strong shaking which lasted some 45 to 60 seconds. P-waves are the fastest seismic waves produced. Thus it became known as “the great San Francisco earthquake,” at least at the time. Select One: A. Strike-slip Faults From A Transform Plate Boundary B. Earthquakes are only found along tectonic plate boundaries. The earthquake was triggered by a slip along the San Andreas Fault. a tornado. Earthquake prediction is an area of intense scientific research. C.In your backyard away from any buildings or power lines. Two 3.4 magnitude earthquakes struck hours apart in the same area in Northern California on Sunday, according to officials. According to the elastic rebound model, earthquakes are caused by energy released when. They typically happen along fault lines since the rock is weaker along a fault vs. along a non-faulted rocky area. This earthquake occurred in 1906 with a magnitude of 7.8 on the Richter scale. Faults in earthquakes sometimes are preceded by ground uplift, but not always. D.is usually most intense when the surface waves arrive. many fires. Earthquakes around the world are extremely common events with an estimated number of more than a million earthquakes every year. Oh no! About 3,000 people died from the earthquake, on the San Andreas Fault, and resulting fire. E.Legislate strict building codes that require strong and flexible buildings. Because tectonic plates are in motion, their edges move against each other and the friction causes earthquakes. It is possible to develop an earthquake warning system that would provide 15 - 60 seconds of warning to an urban area before the arrival of damaging earthquake waves if the earthquake occurred far enough away. D.Excavating large amounts of materials to make buildings. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). The 1906 San Andreas fault event was preceded from 1881 to 1903 by 18 earthquakes of M ≥5.5 and was followed by quiescence, with only three earthquakes of M ≥5.5 until 1954. Which of the following is NOT a reason why building a reservoir would increase earthquakes? Which of the following is TRUE about seismographs taken far from the epicenter of the earthquake as compared to those that are closer? A.decreasing depth from the surface and decreasing distance to the epicenter. Violent shocks punctuated the strong shaking which lasted some 45 to 60 seconds. Earthquakes along the east coast of the U.S. are generally felt at greater distances from the epicenter than similar sized earthquakes in California. Earthquake in the Early Morning DRAFT. Scientist project the San Andreas Fault line could cause a devastating earthquake in California by 2030. The fault divides into three segments, each with different characteristics and a different degree of earthquake risk. Strong earthquakes have been felt in Southeast Missouri, what causes these earthquakes? Earthquakes can be predicted on a short term basis with considerable accuracy by careful measurement of precursor phenomena such as foreshocks and ground deformation. The 150th anniversary of the 1868 earthquake, and all historical earthquake anniversaries, are opportunities to remind people that we live in earthquake country and Which of the following human activities is NOT known to cause earthquakes? Liquefaction, which happens when loosely packed, water-logged sediments lose their strength in response to strong shaking, causes major damage during earthquakes. The great earthquake broke loose some 20 to 25 seconds later, with an epicenter near San Francisco. The earthquakes of California are caused by the movement of huge blocks of the earth's crust- the Pacific and North American plates. Earthquakes can be human-made or natural, although the latter is more abundant. Seismic gap refers to a region where no seismic activity ever occurs. Put Quizlet study sets to work when you prepare for tests in San Francisco Earthquake and other concepts today. Why are most intermediate- to deep-focus earthquakes generated at convergent plate boundaries? If you lived on an active fault and felt a small earthquake, what would that mean? The faults along the San Andreas Fault zone produce around 10,000 earthquakes a year. D.Bedrock causes more ground shaking than mud because the seismic waves are transmitted more efficiently in bedrock. Which of the following is FALSE about the shaking from earthquakes? During an earthquake will one side of the fault always rise up relative to the other side? Not all earthquakes are preceded by foreshocks. Because Japan is so well prepared for earthquakes, it receives little earthquake damage despite experiencing many earthquakes each year.Because Japan is so well prepared for earthquakes, it receives little earthquake damage despite experiencing many earthquakes each year. Which of the following hazards from an earthquake can threaten areas that may not be close enough to feel shaking? There are three different types of faults that create them: the normal fault, the reverse fault and the strik… Although the region was sparsely populated, the quake on the Hayward Fault was one of the most destructive in California’s history. English. An earthquake is the sudden movement of the Earth's tectonic plates, resulting in shaking of the ground.This shaking can result in the damage of various structures such as buildings and further breakdown of the Earth's surface. a hurricane. 23 times. The 1906 earthquake in San Francisco caused most of its casualties in the fires from ruptured gas lines. There is 20 times more ground shaking associated with a magnitude 7 earthquake on the Richter scale compared to a magnitude 5 earthquake. The San Andreas Fault—made infamous by the 1906 San Francisco earthquake—is a strike-slip fault. Annie and Jack got to San Francisco. Earthquakes are caused by the sudden release of energy within some limited region of the rocks of the Earth. San Francisco lays very close, if not on, the San Andreas fault, a line where two tectonic plates meet. There can be many earthquakes over a short time frame in a small area. E.fractured rock that has been displaced, i.e., rocks on one side of the fracture have moved relative to the other side. Which of the following statements is FALSE about P-waves? Where along a fault are you most likely to see a large earthquake? Try our newest study sets that focus on San Francisco Earthquake to increase your studying efficiency and retention. The other way a fault is created is when the strata of the same type of rock are displaced either vertically or horizontally. USGS even created a Google Earth simulation of this historic disaster. 1. The San Andreas Fault is considered a potentially active fault because it has not produced a major quake in over 500 years. The most famous example is California's San Andreas Fault, which stretches some 600 miles (1,000 kilometers) from southern California to north of … On April 20, the U.S.S. What causes earthquakes in San Francisco? B.asthenosphere is dragged over lithosphere. During an earthquake, strain is released and then accumulated again until the next earthquake. D.subduction at a convergent plate boundary. The San Andreas fault caused the biggest earthquakes in California with an approximate magnitude 7.9 in 1857 (Southern California) and 1906 (San Francisco). The distance to the epicenter of an earthquake is found by. Which of the following statements is FALSE about the magnitude of earthquakes? One of the most destructive earthquakes in California history happened on the Hayward Fault in 1868, when a magnitude 6.8 killed 30 people and caused significant damage to property. What is the difference between earthquake intensity and magnitude? The earthquake was felt from southern Oregon to south of Los Angeles and inland as far as central Nevada. Which seismic waves produce the smallest amplitude? Most earthquakes occur at a plate boundary, usually along the Circum-Pacific belt. Which of the following is NOT used to predict an earthquake? 1906 — San Francisco, California, Magnitude: 8. D.Water from the reservoir would lower levels of the groundwater and promote the development of underground caves. Mexico City was built on mud deposits. City officials estimated the casualties at 700 but more modern calculations say about 3,000 lost their lives. What causes earthquakes in San Francisco? answer choices . D.P-waves cause the most damage in an earthquake. In the 1989 Loma Prieta earthquake, most of the casualties were caused by the collapse of the Cypress Structure freeway in the East Bay area. On October 21, 1868, a magnitude 6.8 earthquake struck the San Francisco Bay area. It is considered as one of the biggest Earthquakes in the history of San Francisco. B.An earthquake of magnitude 3 on the Richter scale involves twice the amount of ground shaking as a magnitude 2 earthquake. Vertical movement of rock occurs in all of the following faults EXCEPT. only burned a few houses. 2. A.highly stressed (i.e.,bent) rock breaks and abruptly moves. The faults in the region with the highest estimated probability of generat- ing damaging earthquakes between 2014 and 2043 are the Hayward, Rodgers Creek, Calaveras, and San Andreas Faults. Most are tiny, but occasionally one is massive. They're customizable and designed to help you study and learn more effectively. In general, there is more ground shaking from an earthquake with. Discover free flashcards, games, and test prep activities designed to help you learn about San Francisco Earthquake and other concepts. The U.S. Geological Survey reports: During the 1906 earthquake in the San Francisco region, roads, fences, and rows of trees and bushes that crossed the fault were offset several yards, and the road across the head of Tomales Bay was offset almost 21 feet, the maximum offset recorded. Parts of the San Andreas Fault system adapt to this movement by constant "creep" resulting in many tiny shocks and a few moderate earth tremors. The last major earthquake struck the fault in 1906 in the San Fransisco Bay Area but the USGS is not convinced the scale and intensity of future earthquakes can … Different ground types will causes different amounts of damage to buildings. B.The area on the fault that has not moved in a long time. The earthquake caused about 3,000 deaths and over $524 million in property damages. Chicago rescued 20,000 victims, one of the largest sea evacuations in history, rivaling Dunkirk in World … The energy can be released by elastic strain, gravity, chemical reactions, or even the motion of massive bodies. Earthquake magnitude on the Richter scale is determined by the size of the area damaged from an earthquake. The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. 1. Strike-slip faults tend to occur along the boundaries of plates that are sliding past each other. Earthquakes, somewhere on this rock, happen almost every day. For example, look back on the San Francisco earthquake of 1906. answer choices . Earthquakes are caused exclusively by plate tectonic activity and cannot be caused by human activities. E.The fault is releasing energy, but it is not enough to know what might happen next. Whenever there is movement along a fault, an earthquake is felt. The study of earthquakes is called seismology. a thunderstorm. D.Gravitational attraction between the Moon and the Earth. Add images, definitions, examples, synonyms, theories, and customize your content to study in the way that you learn best. In which of the following faults does the hanging wall move down relative to the footwall? Which of the following is FALSE about slow earthquakes? The death toll is uncertain. Which kind of material would be prone to liquefaction during an earthquake? The San Francisco Bay Area is sliced and diced by a series of faults that together accommodate the relative motion between the Pacific and North American plates. One of the worst oil spills in U.S. history was when a magnitude 8 earthquake struck near the Alaska pipeline and caused multiple large ruptures. Earthquake Faults: Faults are cracks in the earth's rocky crust that form the boundaries of large pieces of the crust, called tectonic plates. The Pacific plate is moving northwest, scraping horizontally past North America at a rate of about 50 millimeters (2 inches) per year. D.No. Which earthquake scale is based mostly on human opinion and perception of recent events? In the San Francisco Bay Area, the Hayward Fault was the site of a magnitude 7.0 earth… A.decreasing depth from the surface and decreasing distance to the epicenter. On its face, the earthquake was a colossal and uncontrollable "act of God," which stole thousands of lives. 1906 San Francisco Earthquake, California. These earthquakes are not random; rather, they are the effect of different changes occurring in the earth’s crust for a long time. In 1906 San Francisco was the ninth largest U.S. city with a population of 400,000, and over 225,000 were left homeless by the disaster. Which of the following best describes a fault? 2. Which of the following is the most realistic approach to minimizing earthquake hazards? B. 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