21. NASA - Top Story Aug 2, 2004 Caption for Item 2 A Decade of earthquakes in Southern Alaska earthquakes occurred in Scandinavia as the large glaciers began to melt. http://www.nasa.gov/centers/goddard/news/topstory/2004/0715glacierquakes.html

There's a problem with your browser or settings. Your browser or your browser's settings are not supported. To get the best experience possible, please download a compatible browser. If you know your browser is up to date, you should check to ensure that javascript is enabled. Follow this link to skip to the main content NASA - National Aeronautics and Space Administration Help and Preferences NASA Home Centers Goddard Home News Top Story Send Bookmark Print var itemIdAndJSFileURL= 'centers-goddard_news$/templateimages/redesign/leftnav-htmls/centers-goddard_.js'; var splitResult = itemIdAndJSFileURL.split("$"); $('menu_item_id').value = splitResult[0]; var url = splitResult[1]; var defPage = '/templateimages/redesign/leftnav-htmls/home_.js'; if(url == '.js') url = defPage; document.write('' + ''); Text Size Related Links For more information contact: Gretchen Cook-Anderson Headquarters, Washington

22. Earthquakes, Earthquake, Earthquake Information At LiveScience.com LiveScience.com explains earthquakes, earthquake, earthquake information, earthquakes and fault lines and recent earthquakes. http://www.livescience.com/earthquakes/

All About Earthquakes Whether occurring naturally or caused by man, earthquakes most often manifest themselves by a shaking of the ground. Most earthquakes are tectonic and occur when the frictional stress of gliding plate boundaries exceeds a certain value and causes a failure at a fault line, which results in a violent displacement of the Earth’s crust. At this point, elastic strain energy is released and elastic waves are radiated, leading to an earthquake . Induced earthquakes may happen for a variety of reasons, including extraction of minerals from Earth and the collapse of large buildings. Visit LiveScience.com for the most relevant earthquake information. Read our news articles and participate in our interactive features , and come to understand why recent earthquakes have occurred. Stay updated on the latest research of earthquakes and fault lines and see where scientists are predicting the next seismic quake to occur. Click on the links below and begin to learn all there is to know and more about earthquakes. Featured Earthquake Stores Scientists Downplay Gulf Earthquake Fears Silent Earthquakes Might Predict Major Events San Andreas 'Fully Loaded' for Major Quake Earthquake Aftershocks Not What They Seemed ... U.S. Lags in Quake Warning

23. San Jose Earthquakes: Home: Home earthquakes Commercials. Can t get enough Quakes commercials? Check them out. get more commercials Are you a huge earthquakes fan? You re not alone! http://web.mlsnet.com/t110/

var team_code = "t110"; var section_id = "Home"; var page_id = "index"; ALERT: var flashAlert = new FlashObject("/flash/alerts_team.swf", "alert_mls", "370", "15", "6", "#6FA7D0"); flashAlert.addVariable("sourcefile", escape("/mls/components/news/alerts.xml")); flashAlert.addVariable("wait", 45); flashAlert.addVariable("hlink", "0xcccccc"); flashAlert.write("teamAlert"); SEARCH: SITE MLS NETWORK TICKETS SHOP AUCTIONS VIDEO/AUDIO ... Mobile writeAd(120,240,1) QUAKES POLL Who was the San Jose Earthquakes Man of the Match vs. Houston? N. Grabavoy I. Guerrero R. Johnson K. Kamara Quotes: SJ 2, HOU 1 Cannon blog Fathers Day Four Pack Quakes-Dynamo Look back at the Quakes' big home win over the Dynamo. Watch now Quakes-Crew recap Quakes-FCD recap Quakes-Rapids recap ... Johnson's muscle gives Quakes lift Vote for your MLS All-Stars! writeAd(430,60,1)

24. Savage Earth: Restless Planet Sections on learning from earthquakes, predicting quakes, and engineering quakeresistant buildings. Uses Flash animation and Quicktime video. http://www.pbs.org/wnet/savageearth/earthquakes/index.html

var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); Earth: All Stressed Out by Daniel Pendick To experience the drama of plate tectonics the jostling of the giant plates that carry continents and oceans try this experiment: Sit in a comfortable chair, hold your hand out, and watch your fingernails grow. That's about the average speed of a tectonic plate. But wait around long enough, and even the tortoise crawl of plate tectonics will have dramatic and deadly consequences. Though plate tectonics is a global phenomenon and virtually invisible to us in our daily lives, it introduces enormous stresses in the crust where we live. From time to time, stressed-out crust releases the stress in sudden fits: earthquakes. More frequently than time to time, actually. If you imagine the Earth as a giant bell, it's ringing with earthquakes every second of the day from the many imperceptible clinks of microquakes to the deafening gong of very occasional but "great" earthquakes (those of magnitude 8.0 or greater). The U.S. Geological Survey estimates that several million temblors, most undetectable, happen every day. The great earthquake of 1906 devastated San Francisco, killing 700.

25. Plate Tectonics, The Cause Of Earthquakes The map below locates earthquakes around the globe. They are not evenly distributed; the boundaries between the plates grind against each other, http://www.seismo.unr.edu/ftp/pub/louie/class/100/plate-tectonics.html

Plate Tectonics, the Cause of Earthquakes The plates consist of an outer layer of the Earth, the lithosphere , which is cool enough to behave as a more or less rigid shell. Occasionally the hot asthenosphere of the Earth finds a weak place in the lithosphere to rise buoyantly as a plume, or hotspot. The satellite image below shows the volcanic islands of the Galapagos hotspot. (from NASA) Only lithosphere has the strength and the brittle behavior to fracture in an earthquake. The map below locates earthquakes around the globe. They are not evenly distributed; the boundaries between the plates grind against each other, producing most earthquakes. So the lines of earthquakes help define the plates: (from the USGS) In cross section, the Earth releases its internal heat by convecting, or boiling much like a pot of pudding on the stove. Hot asthenospheric mantle rises to the surface and spreads laterally, transporting oceans and continents as on a slow conveyor belt. The speed of this motion is a few centimeters per year, about as fast as your fingernails grow. The new lithosphere, created at the ocean spreading centers, cools as it ages and eventually becomes dense enough to sink back into the mantle. The subducted crust releases water to form volcanic island chains above, and after a few hundred million years will be heated and recycled back to the spreading centers. Earthquake occurrence in different plate tectonic settings: The map below of Earth's solid surface shows many of the features caused by plate tectonics. The oceanic ridges are the asthenospheric spreading centers, creating new oceanic crust. Subduction zones appear as deep oceanic trenches. Most of the continental mountain belts occur where plates are pressing against one another. The white squares locate examples given here of the different tectonic and earthquake environments.

26. The Global Earthquake Response Center -- A WebMagic Site A comprehensive set of online resources to prepare yourself, your home and your business for an earthquake, plus links to upto-the-minute news about http://www.earthquakes.com/

A WebMagic site Register Now! (free) News Games ... QUAKE DATA Our secure online catalog features a comprehensive line of durable, high-quality products designed to fortify your home and office in preparation for an earthquake. Catalog is offline today. Check back soon. Please pick from the following web site categories: Survival Supplies Survival Kits Disasters Earthquake Safety ... Seismic Testing Earthquakes occur all over the world every day, so we've created a page where you can track the most recent seismic activity. Due to high traffic, this link is down for repair and upgrading. PREPAREDNESS DID YOU KNOW? Are you ready for the Big One? Our checklist can help you gather the supplies you'll need to survive a major quake. To the checklist Could a powerful enough earthquake cause California to break off and fall into the ocean? The answer FOR KIDS FEATURED EARTHQUAKE LINKS Looking for easy-to-understand information about earthquakes and seismology? We can help! We've created a guide to some of the best material available for students and teachers to help understand why quakes occur and what's being done to make our world safer. Continue Hector Mine (California) Earthquake, M7.1, Oct. 16, 1999:

27. Earthquakes earthquakes What are earthquakes? Why do they occur? Why can t we predict them? You will find the answers to all of these questions at this site. http://edtech.kennesaw.edu/web/earthqu.html

Earthquakes Research/Informational Sites ABC of Earthquakes - Children's book...Click on "Next" or a letter of the alphabet to continue your ABC journey. A Parent Guide to Earthquakes California Has Its Faults! Cool Earth Facts Earthforce - From the Franklin Institute Earthquake Legends Throughout the World Earthquake Preparedness - For teachers and parents. Earthquake Research Institute - Links to earthquake information. Earthquakes - What are earthquakes? Why do they occur? Why can't we predict them? You will find the answers to all of these questions at this site. Earthquakes - This is a comprehensive site on earthquakes. Earthquakes for Kids - Very informative site! Wow!!! Earthquakes - Theme page from Gander Academy. Effects of Earthquakes FAQs on Earthquakes in Nevada FEMA for Kids Life Along the Faultline - Life and science in earthquake country at the Exploratorium. Living on Shaky Ground - How to survive an earthquake. Mountain Maker, Earth Shaker Museum of San Francisco - Earthquakes National Earthquake Information Center Plate Tectonics, the Cause of Earthquakes

28. The Earthquake Shake - Teaser Green Overview Help Next Page. earthquakes cracking earth http://www.thetech.org/exhibits/online/quakes/

29. Recent Earthquakes In The Pacific Northwest All about earthquakes and geologic hazards of the Pacific Northwest Lists of M 3 earthquakes and of all earthquakes appearing on the above map. http://www.pnsn.org/recenteqs/latest.htm

The Pacific Northwest Seismic Network All about earthquakes and geologic hazards of the Pacific Northwest HOME Latest Quakes Volcanoes Research ... CONTACT US Latest Quakes Recent Quakes Notable Quakes Webicorders - Real-time displays NEWS ShakeMap - Instrumental Shaking Did You Feel It? - Human Shaking Reports Volcano Quakes Tsunami Warning Center US Earthquakes Canadian Earthquakes ... World Earthquakes Click on an earthquake on the map above to zoom in. Did you feel it? - Report an Earthquake ShakeMaps - Washington and Oregon Special maps - Mount St. Helens Seattle Region Try to reload this page if you do not have the most current map. Maps are updated within 5 minutes of an earthquake and once an hour. Magnitude = ? for new earthquakes until a magnitude is determined (4-5 minutes). Big earthquake list All earthquake list About Real-time Earthquake Maps Old version of maps without sidebar This file is wrapped in the "recenteq" wrapper last modified 10/4/02

30. Natural Hazards - Earthquakes earthquakes are one of the most costly natural hazards faced by the Nation, posing a significant risk to 75 million Americans in 39 States. http://www.usgs.gov/hazards/earthquakes/

@import url("/styles/common.css"); USGS Home Contact USGS Search USGS Natural Hazards Maps, Imagery, and Publications Hazards Newsroom Education ... Back to Natural Hazards Gateway Home This map shows relative shaking hazards in the United States and Puerto Rico. During a 50-year time period, the probability of strong shaking increases from very low (white), to moderate (blue, green, and yellow), to high (orange, pink, and red). Map not to scale. Source: USGS Hi-res Low-res Natural Hazards - Earthquakes Earthquakes are one of the most costly natural hazards faced by the Nation, posing a significant risk to 75 million Americans in 39 States. The risks that earthquakes pose to society, including death, injury, and economic loss, can be greatly reduced by (1) better planning, construction, and mitigation practices before earthquakes happen, and (2) providing critical and timely information to improve response after they occur. As part of the multi-agency National Earthquake Hazards Reduction Program, the U.S. Geological Survey (USGS) has the lead Federal responsibility to provide notification of earthquakes in order to enhance public safety and to reduce losses through effective forecasts based on the best possible scientific information. Earthquake Hazards Program (fact sheet) (fact sheet) M 5.4, central Peru

31. The Why Files | 1. Earth Quaking Again earthquakes in Pakistan and Indian Ocean kill thousands, raise need for better understanding of earthquakes and tsunamis. http://whyfiles.org/094quake/

The Why Files whyfiles.org POSTED 3 NOVEMBER 2005 Asian earthquake tragedy More than 50,000 are dead, and about 3 million homeless, after a large earthquake shook Pakistan's Northwest Frontier Province on Oct. 8. With mountain villages and roads destroyed, hundreds of thousands are still waiting for relief as winter approaches. Fortunately, the death toll will never approach that of the disastrous Dec. 26, 2004 earthquake, which started a tsunami that devastated coastlines from Sumatra to India and killed an estimated 285,000. The Indian Ocean quake was the strongest in 40 years, and it struck a region where a cataclysmic earthquake was not expected. In the aftermath of the Oct. 8 earthquake, residents wander in disbelief through a city in Pakistan AP photo Those death tolls make us think it's time to get a better grip on earthquake science. How does the Earth shake? Can we expect any improvements in earthquake prediction? Are we getting better at pinpointing their hazards? Earthquakes are ground motion that occurs when adjacent parts of the Earth suddenly slide past each other. Most earthquakes occur at boundaries between the giant plates that make up Earth's crust. These plates "float" on deep, hot, gooey rock called the mantle, slowly moving in relation to each other, at speeds of up to a few centimeters a year. After a huge earthquake last December, tsunami waves struck Indonesia, Thailand, India and Sri Lanka, causing horrific devastation along the coast.

32. Earthquakes Topic earthquakes release stress which causes permanent change in the Earth s crust. Note For further reference on earthquakes, please see SCEC s Regional http://scign.jpl.nasa.gov/learn/eq.htm

Earthquakes release stress which causes permanent change in the Earth's crust. Note: For further reference on earthquakes, please see SCEC's Regional Seismicity Education Module. What are earthquakes? Types of earthquakes Forces What causes stress? ... Earthquake activities References Bolt, B.A.1993. Earthquakes. W.H. Freeman and Company, New York, 331 p. Montgomery, C.W. 1990. Physical Geology, Second Edition. Wm. C. Brown Publishers, Dubuque, Iowa, 555p. Tarbuck, E.J. and F.K. Lutgens. 1984. Earth: An Introduction to Physical Geology, First Edition. Charles E. Merrill Publishing Company, Columbus, Ohio, 594 p. Last modified on 8/14/98 by Maggi Glasscoe ( scignedu@jpl.nasa.gov

33. BBC NEWS | Science/Nature | How Earthquakes Happen Why does the earth move? A guide to the origin of earthquakes. http://news.bbc.co.uk/1/hi/world/4126809.stm

@import "/css/screen/shared/v4/mastheadfooter.css?v36"; @import "/css/screen/shared/v4/styles.css?v36"; @import "/css/screen/shared/emp.css?v36"; @import "/css/screen/nol/v4/styles.css?v36"; @import "/css/screen/nol/v4/furniture.css?v36"; @import "/css/screen/nol/v4/promo.css?v36"; Accessibility Links Skip to content Skip to bbc.co.uk search Low Graphics Accessibility help ... Access keys help Search term Explore the BBC BBC News Updated every minute of every day BBC News channel News Front Page World UK England ... Special Reports Related BBC sites Sport Weather Radio 1 Newsbeat CBBC Newsround ... Editors' Blog Site Version UK Version International Version About the versions Page last updated at 11:26 GMT, Tuesday, 22 February 2005 E-mail this to a friend Printable version How earthquakes happen If you would like a printable, non-animated version of this graphic, click on the following link to open a PDF file and then follow the icon to print that file. How earthquakes happen Most computers will open PDF documents automatically, but you may need to download Adobe Acrobat Reader. Download the reader here E-mail this to a friend Printable version Bookmark with: Delicious Digg reddit Facebook ... What are these?

34. Volcanoes, Earthquakes, Hurricanes, Tornadoes—Forces Of Nature: Science, Maps, Explore the science behind volcanoes and earthquakes, and then make your own! Delve into the forces of nature3 D models, photos, case studies, videos, http://www.nationalgeographic.com/forcesofnature/interactive/index.html

Your browser does not support the interactive portion of this site because it does not allow either javascript or frames. Go to the home page Your browser does not support the interactive portion of this site because it does not allow either javascript or frames. Go to the home page

35. Earthquakes Theme Page The primary focus of the Community Learning Network (CLN) is to help K12 teachers integrate Information Technology into their classrooms. http://www.cln.org/themes/earthquakes.html

Earthquakes Theme Page Below are the CLN "Theme Pages" which may supplement the study of earthquakes. CLN's theme pages are collections of useful Internet educational resources within a narrow curricular topic and contain links to two types of information. Students and teachers will find curricular resources (information, content...) to help them learn about this topic. In addition, there are links to instructional materials (lesson plans) which will help teachers provide instruction in this theme. Natural Disasters Avalanches Theme Page Blizzards Theme Page Floods Theme Page Hurricanes Theme Page ... Volcanoes Theme Page General Earthquake Resources This "Theme Page" has links to two types of resources related to the study of earthquakes. Students and teachers will find curricular resources (information, content...) to help them learn about this topic. In addition, there are also links to instructional materials (lesson plans) which will help teachers provide instruction in this theme. Please read our [The] ABC's of Plate Tectonics "A broad analysis of the basic principles that should apply to the movements of plates, some new hypotheses about how they apply to convection and landform formation, and some expected scenarios for differing tectonic events."

36. Earthquakes In Hawai`i Summary information about earthquakes in Hawai`i, especially on the Big Island of Hawai`i, including hazard information, recent earthquake locations and http://hvo.wr.usgs.gov/earthquakes/

[ TEXT ONLY ] Current Eqs Felt EQs Destructive Eqs Seismicity Hazards, Zoning Instruments HVO electronic technicians upgrading seismic network Earthquakes in Hawai`i are closely linked to volcanism. They are an important part of the island-building processes that have shaped the Island of Hawai`i and the other Hawaiian Islands. Thousands of earthquakes occur every year beneath the Island of Hawai`i. Eruptions and magma movement within the presently active volcanoes (Kilauea, Mauna Loa and Lo`ihi) are usually accompanied by numerous small earthquakes. They originate in regions of magma storage or along the paths that magma follows as it rises and moves prior to eruption. These are loosely termed volcanic earthquakes. Many other earthquakes, including the largest ones, occur in areas of structural weakness at the base of Hawai`i's volcanoes or deep within the Earth's crust beneath the island. These are referred to as tectonic earthquakes. In the past 150 years, several strong tectonic earthquakes (magnitude 6 to 8) caused extensive damage to roads, buildings, and homes, triggered local tsunami, and resulted in loss of life. The most destructive earthquake in Hawai`i's history occurred on April 2, 1868, when 81 people lost their lives. With a magnitude of 7.9 and a maximum intensity of XII, this destructive earthquake destroyed more than a hundred homes and generated a 15-m high tsunami along Kilauea's south coast.

37. Earthquakes! earthquakes in residential areas, such as this 1964 one in Seward, Alaska, can cause unparalleled damage to life and property. http://www.infoplease.com/spot/earthquake1.html

Site Map FAQ in All Infoplease Almanacs Biographies Dictionary Encyclopedia Spelling Checker Daily Almanac for May 28, 2008 Search White Pages Skip Navigation Home Almanacs ... Word of the Day Editor's Favorites Asian Pacific American Heritage Month Father's Day 2008 Summer Olympics Friday the 13th ... 2008 Calendar Search: Infoplease Info search tips Search: Biographies Bio search tips Earthquakes About 8,000 mini-quakes a day, and on average, one exceptionally big one per year by Borgna Brunner Earthquakes in residential areas, such as this 1964 one in Seward, Alaska, can cause unparalleled damage to life and property. There are thousands upon thousands of earthquakes annually, ranging on average from 18 major quakes to more than 2 million very minor ones per year (approximately 8,000 per day). On average, we can expect one exceptionally big one (with a magnitude of 8 or higher) each year. Earthquakes plate tectonics Not "On the Richter Scale" Although "on the Richter Scale" is still a commonly used expression, the scale , developed by Charles F. Richter of California Institute of Technology in 1935, is no longer the most commonly used

38. Earthquakes Easier An earthquake makes the ground move or shake. These natural events can cause massive damage and destruction. The study of earthquakes is called http://42explore.com/quakes.htm

The Topic: Earthquakes Easier - An earthquake makes the ground move or shake. These natural events can cause massive damage and destruction. The study of earthquakes is called seismology. Harder - An earthquake is caused by sudden, violent shifting of massive rocks called plates under the earth's surface. This movement of the plates releases stress that accumulates along geologic faults. A fault is a deep crack that marks the boundary between two of these plates. Earthquake belts occur along faults around the world. Many run along coastal areas. The San Andreas fault in central California is well-known for causing severe earthquakes. The epicenter is the point on the surface where the earthquake is the strongest. The Richter scale is used to measure the amount of energy released by the earthquake. The severity of an earthquake runs from to 9 on this scale. Small tremors occur constantly, but every few months a major earthquake occurs somewhere in the world. Scientists are researching ways to predict earthquakes, but their predictions are not always accurate. National Earthquake Information Center (Dept. of the Interior, U.S. Geological Survey, Golden, Colorado)

39. Recent Earthquakes Alaska Earthquake Information Center. Recent earthquakes. Other maps. Global View. 78 earthquakes Shown on This Page http://www.aeic.alaska.edu/Seis/recenteqs/index.html

Recent Earthquakes Other maps: Global View 102 Earthquakes Shown on This Page: Local Time Magnitude Region 05:15 PM AKDT Wednesday May 28th, 2008 1.77 ML in the Andreanof Islands region of Alaska 05:08 PM AKDT Wednesday May 28th, 2008 ... in the central region of Alaska Other seismic regions: Nevada Hawaii Western Canada US Intermountain West ... California Credits:

40. EarthquakesCanada Main Index - Canada Saturday, March 15, 0744 a.m.PDT A magnitude 6 earthquake occurred off the Oregon coast, 220 km WNW of Crescent City, California. This earthquake was too http://earthquakescanada.nrcan.gc.ca/index_e.php

Contact us Help Search Canada Site ... Printer version Episodic Tremor and Slip (ETS) More information Feedback Welcome to the new EarthquakesCanada website. For comments or concerns please fill out our comments form Earth Sciences Sector Priorities Canadian Hazard Information Service Earthquakes Canada Recent News The forecast 2008 Episodic Tremor and Slip (ETS) event is now underway beneath southern Vancouver Island on Canada's west coast. Tremor is observed on the seismographs and GPS instruments are moving to the west. ETS events happen about every 15 months beneath southern Vancouver Island. They are so regular they can be forecast. ETS events cannot be felt, and pose no threat to the public. Click here for technical details. 2008-05-12: A magnitude 7.9 earthquake occurred near Chengdu, China. At least 40000 deaths have been reported. More details on the earthquake are available at the United States Geological Survey Recent Earthquake Reports 2008-05-23: magnitude 4.5 ML, Wernecke Mountains, YT 2008-05-04: magnitude 4.2 ML, near Burwash Landing, YT felt 2008-04-27: magnitude 4.8 Mb, offshore Vancouver Island, BC

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