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The Southern California Earthquake Hazards Program website has been moved. It is now part of the National Earthquake Hazards Program website. Please look for the new location of this webpage at: The new URL is http://earthquake.usgs.gov/regional/sca/

New York State High School Regents Exam Prep Earth Science What are earthquakes? An earthquake is any shaking or vibration of the earth's crust. They occur where stress builds at a zone of weakness or at a break in the earths crust called a fault . Seismic waves are generated in all directions from the point on the fault that moved. This point is called the focus. The point directly above the focus on the earth's surface is called the epicenter. This is what you see plotted on a map to ...

Earthquakes Canada - WestSéismes Canada - Ouest The Earthquakes Canada - West Web site has been relocated. The page you attempted to view no longer exists. Le site Web de Séismes Canada - Ouest a été relocalisé. La page que vous tentez de visualiser n'existe plus. New Web site: Earthquakes Canada home page Earthquakes Canada: Site map Contact us Nouveau site Web : Page d'accueil de Séismes Canada Séismes Canada: Plan du site Contactez-nous Please update your bookmarks and links. Veuillez, s.v.p., mettre vos signets et vos liens à jour.

BACKNEXT GEOLOGY INDEXSTUDY QUESTIONS Earthquake Measurement Earthquake measurement is not a simple problem. It is hampered by many things. Few people are capable of observing carefully what is happening around them when they are experiencing an earthquake. Moreover, equipment and structures often fail during severe earthquakes. Also, most quakes only last seconds or at most, minutes. Lastly, effects of the same event vary widely from location to location. Therefore it is difficult to co ...

The Richter Scale - Magnitude and Earthquake Energy by Student Earthquakes are measured in two different ways. The most scientific measure is the Richter scale which tells us an earthquake's magnitude or how much energy was released by the fault movement. For each earthquake there is only ONE magnitude or Richter measurement. Click on the following hyperlink to learn more about the Richter Scale and Magnitude. How does the release of earthquake energy effect buildings? Richter Magnitude Image courtesy of University of Nevada Reno, Seismological Laboratory Evidence Information KEYWORDSRichter scale, energy, earthquakes, magnitude SUBMITTERKevin Oliver KIE Evidence. Copyright © 1996-7 The KIE Group. All rights reserved.

Modified Mercalli Intensity Scale ABAG uses the modified Mercalli Intensity Scale to depict shaking severity. For additional information on the percentages of residential units that have statistically been made uninhabitable in past California earthquakes by construction type and MMI level, click here. For information on how to make your home safer, click here. If this table is garbled, try the plain text version. MMI ValueDescription of Shaking SeveritySummary Damage Description Used o ...

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NOT a 6.8 Richter Magnitude The 28 February 2001 Nisqually (Washington, USA) Earthquake Joseph Hull, Seattle Central Community College copyright 2001 Joseph Hull return to the 2001 Nisqually quake page return to Joe Hull's main menu NOT a 6.8 Richter magnitude (see answer at bottom) Earthquake coverage by the media is always problematic ("fault lines", predictions using freaked-out pets, etc.) however the 2001 Nisqually earthquake has received some abnormally strange press c ...

Society for Amateur Scientists The Severity of an Earthquake Related Products Join The Society for Amateur Scientists The Severity of an Earthquake sponsored by THE SEVERITY OF AN EARTHQUAKE can be expressed in terms of both intensity and magnitude. However, the two terms are quite different, and they are often confused. Figure 1: San Francisco, 1906. Collapse of City Hall after the 8.3 magnitude earthquake. Most of the property destruction was caused by the fire th ...

General Earthquake Information Earthquake Frequently Asked Questions (Answers to frequently asked questions about earthquakes) Measuring the Size of an Earthquake The Richter Magnitude Scale The Moment Magnitude Scale The Modified Mercalli Intensity Scale This Dynamic Earth (external link) Putting Down Roots in Earthquake Country (external link) Home | Public | Schools | Business | Government | Engineering | Research Arkansas Center for Earthquake Education and Technology Transfer (ACEETT) Graduate Institute of Technology 2801 South University Little Rock AR 72204 (501) 569-8164 Last Updated: September 10, 1998 earthquake@quake.ualr.edu Copyright 1998, UALR. All rights reserved. http://quake.ualr.edu/public/general.htm

USGS Home Contact USGS Search USGS Earthquake Hazards Program Home Earthquake Center Regional Information Learning & Education Research & Monitoring Additional Resources Home » Learning & Education » FAQ Earthquake Facts Earthquakes for Kids Earthquake Topics FAQs Earthquakes, Faults, Plate Tectonics, Earth Structure Common Myths about Earthquakes Measuring Earthquakes Current Earthquake Information Seismographs Earthquake Effects & Experiences Probabilities, Seismi ...

Next section-- Previous section-- Table of Contents-- Pacific Northwest Earthquakes HOW ARE EARTHQUAKES MEASURED? taken from "Washington State Earthquake Hazards", by Linda Noson, Anthony Q amar, and Gerald Thorsen The size of an earthquake is indicated by a number called its magnitude. Magnitude is calculated from a measurement of either the amplitude or the duration of specific types of recorded seismic waves. Magnitude is determined from measurements made from seismograms ...

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