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/Home/Sciences/Earth & Space/Geology/Tectonics/Faults Airborne Hunt for Faults in the Portland-Vancouver Area Votes:0 Latest Quake Info General Quake Info Hazards & Preparedness Earthquake Research Special Features Additional Resources Understanding Earthquake Hazards in the Pacific Northwest Airborne Hunt for Faults in the Portland-Vancouver Area Geologic hazards in the Portland-Vancouver area include faults entirely hidden by river sediments, vegetation, and urban development. A recent aerial geophysical survey revealed patterns in the Earth's magnetic field that confirm the existence of a previously suspected fault running through Portland. It also indicated that this fault may pose a significant seismic threat. This discovery has enabled the residents of the populous area to better prepare for future earthquakes. (Click on image for a full size version - 32K) The populous Portland-Vancouver (Oregon/Wa Read More Go to Site Earthquakes Canada East - new Web site / SÉismes Canada Est - nouveau site Web Votes:0 Earthquakes Canada - East SÉismes Canada - Est The Earthquakes Canada - East Web site has been relocated. The page you attempted to view no longer exists. Le site Web de SÉismes Canada - Est 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 ? jour. Read More Go to Site Exploratorium: Faultline, Seismic Science at the Epicenter Votes:0 Faultine: Seismic Science at the Epicenter is made possible through the generosity of The Gordon and Betty Moore Foundation and the Jim Clark Endowment for Internet Education. Live Eye • Great Shakes • Quake Basics • Damage Control • Active Zone Web site credits © Exploratorium In April 1906, an earthquake devastated San Francisco. Seismologists say another major temblor is due soon. What do we know now that we didn't then? A lot, but not enough. Read More Go to Site Fault creep along the Calaveras in Hollister, California Votes:0 A walking tour of the Calaveras fault in Hollister, California Introduction Hollister, California is located South of the San Francisco Bay area. (Here is a regional map courtesy of Xerox PARC.) In the Bay area there are three major faults, from West to East the San Andreas, the Hayward, and the Calaveras; all are part of the San Andreas fault system. The USGS continuously monitors their activity. All of these are ``right-lateral strike-slip faults'', which means that the motion is predominantly horizontal, with the land on the West side of the fault moving North. South of the Bay Area the Hayward and Calaveras merge into the San Andreas. Hollister is located just North of where this happens, right on top of the Southern end of the Calaveras fault. What makes Hollister particularly interes Read More Go to Site Faults Votes:0 In this site you can find information on geological faults. To find out what these things are and to learn something of their importance, visit the introduction first. You can also choose topics from the column of icons. Most of this material relates to the first year course in structural geology in Leeds (EARS 1053). However, more advanced materials lie behind if you keep exploring. Alternatively you can choose to scroll through the picture gallery . Introduction Fault types Normal faults Thrusts Strike-slip faults Faults and stress Basic geometries of so-called " soft-linked" fault systems Picture gallery Read More Go to Site Faults.html Votes:0 Produced by M. Mustoe Ph.D. Geographer Eastern Oregon University If you've recently been in an earthquake and have observed your pets or animals doing strange things, please check the Seismic Activity and Animal Behaviour SAAB site. This page and its graphics are ©1997 by Dr. M. Mustoe Also see Dr. M's other sites: Glaciers , Columbia Plateau Basalt , Ribbon Cliff Earthquake Granite Mt St. Helens Links and information Designed With The Four BASIC Types Of Faults (This does not include growth faults) The Normal Fault The normal fault is not necessarily normal in the sense that it is common....because.... it is not the most common of faults. However what is normal about them is that their movement tends to follow the gravitational pull on the fault blocks involved. The fault plane on the nor Read More Go to Site Geological faults Votes:0 Geological faults A fault is a discontinuity in a rock mass; locally it can be seen as a plane. It is along this surface that stresses buily up in the earth's crust are relieved by the motion of the two bodies of rock with respect to each other, i.e. an earthquake. The names for the two blocks are derived from old mining nomenclature. The block on top along the fault is known as the hanging wall; the block on the bottom is called the footwall. In a normal fault, the stress is caused by stretching or extension of the earth's crust. In this case the hanging wall moves downward with respect to the footwall. This is the way most of the mountain ranges have been formed. A reverse fault is caused by compression of the earth's crust. In this case, the footwall moves down with respect to the hangi Read More Go to Site Geological Society - Home Votes:0 Skip to content Home Contact Us Login / My GSL The Society Membership | Chartership/Designations | Professional Information | Bicentenary | Corporate Affiliates | Staff/Committees | Society Business | Governance | Society Awards and Research Grants | History | Contact Us Publications Journals | Books | Bookshop | Lyell Collection | Permissions | Instructions for Authors | Publishing House Contacts | Supplementary Publications | Code of Publishing Ethics Library and Information Services Lyell Centre | Library Catalogue | Map GIS | Current Serials List | Collections | Services | Use of the Library | Online Resources | Fellowship Directory | Photo Library | Acronym/Organisation Guide | Events Event Listings | Room Hire | Past Meeting Resources | Conference Services | Meeting Proposals Educati Read More Go to Site Glossary of Geological Terms Votes:0 Dictionary of Geologic Terms A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # - A - Aa: A blocky and fragmented form of lava occurring in flows with fissured and angular surfaces. A-horizon: The uppermost layer of a soil, containing organic material and leached minerals. Algal mat: A layered communal growth of algae observed in fossils an in present day tidal zones associated with carbonate sedimentation. Alkali metal: A strongly basic metal like potassium or sodium. Alluvial fan: A low, cone shaped deposit of terrestrial sediment formed where a stream undergoes an abrupt reduction of slope. Alluvium: Unconsolidated terrestrial sediment composed of sorted or unsorted sand, gravel, and clay that has been deposited by water. Angle of repose: The steepest slope angle in which particular Read More Go to Site Hayward fault tour Votes:0 TOUR OF THE HAYWARD FAULT Introduction to the Hayward Fault The Hayward fault extends from San Jose 120 km or about 74 miles northward along the base of the East Bay Hills to San Pablo Bay. Two types of fault movement occur along faults. One type is the catastrophic rupture of the ground that generates large earthquakes. A large earthquake, estimated to have been about magnitude 7, occurred on the Hayward fault in 1868 and was the "great" earthquake of the Bay Area prior to 1906. Descriptions from the 1868 Hayward earthquake report a meter or about 3 feet of fault rupture in the City of Hayward. The other type is a very slow movement of the fault, a few millimeters or a fraction of an inch a year that does not generate earthquakes. This slow movement, called fault creep (or tectonic creep) Read More Go to Site Hayward Fault: Home Votes:0 The Hayward Fault Overview Maps & Tours Seismicity & Earthquake Potential Monitoring & Research Hazards & Preparedness Further Reading Photo by Sunderland Aerial Photographs, Oakland, circa 1965. Hayward Fault Home Overview Maps & Tours Monitoring & Research Seismicity & Earthquake Potential Hazards & Preparedness Further Reading Berkeley Seismological Laboratory 202 McCone Hall, UC Berkeley, Berkeley CA 94720-4760 Questions and comments to www@seismo.berkeley.edu Copyright 2003, The Regents of the University of California. Last modified: Wed Mar 16 09:37:44 PST 2005 Read More Go to Site http://pangea.stanford.edu/GP/sanandreas2000/Nur.pdf Votes:0 PDF Document Read More Go to Site Nasca_Lines_Project Votes:0 The Nasca Lines Project (1996-2000 ) Background Starting in 1996 I collaborated with David Johnson, a teacher, videographer and independent scholar from Poughkeepsie, New York, on a project linking the famous Nasca Lines or geoglyphs with sources of subterranean water. Dave and I met by accident in the Nasca Valley when I was doing preliminary research for my survey of the lower drainage and Johnson was working as a videographer for the Catholic Church documenting the church's activities in Nasca. While there, Johnson became familiar with the scarcity of water in the region and the effect that this had on agricultural production and the quality of life. I introduced him to the archaeology of the area, and he became fascinated with the relationship of the archaeological sites to water sourc Read More Go to Site Plate Boundary Structure Along the San Andreas Fault Votes:0 Plate Boundary Structure Along the San Andreas Fault Author: Furlong, Kevin The San Andreas plate boundary through California represents perhaps the best studied major fault zone in the world. Even with the large amount of geological and geophysical data which have been collected, much is still unknown about the causes, timing, and triggering of major earthquakes along the boundary. In our research at Penn State, we are focusing on improving our picture of the three- dimensional structure of the crust and lithosphere along the Pacific-North America plate boundary. We have active research projects imaging the 3-D crustal structure in the San Francisco Bay region using seismic tomography (right), evaluating the consequences of a complex plate boundary structure for the region (below), and st Read More Go to Site The New Madrid Fault Zone or System - Maps, Facts, Historical Information, and Prediction Information Votes:0 The New Madrid Fault Zone (NMFZ) General Introduction to the New Madrid, Missouri Seismic Zone The New Madrid Fault System The New Madrid Seismic Zone Uncovering Hidden Hazards in the Mississippi Valley USGS Fact Sheet: The Mississippi Valley - "Whole Lotta Shakin' Goin' On" Historical A Contribution To The Documentation Of The 1811-1812 Mississippi Valley Earthquake Sequence - R. Street Deformation Associated with the February 12, 1812, New Madrid, Missouri, Earthquake Old Picture of Damage Published Accounts of the Effects of the 1811 and 1812 Earthquakes Tecumseh and the New Madrid Earthquake, December, 1811 The Mississippi Valley Earthquakes Of 1811 And 1812: Intensities, Ground Motion And Magnitudes - Otto W. Nuttli The Great New Madrid Earthquake Recent September 17, 1997 3 Read More Go to Site The New Madrid Seismic Zone. Votes:0 THE NEW MADRID FAULT The New Madrid Fault System extends 120 Miles southward from the area of Charleston, Missouri, and Cairo, Illinois, through New Madrid and Caruthersville, following Interstate 55 to Blytheville and on down to Marked Tree, Arkansas. It crosses five state lines and cuts across the Mississippi River in three places and the Ohio River in two places. The Fault is Active, averaging more than 200 measured events per year (1.0 or more on the Richter scale), about 20 per month. Tremors large enough to be felt (2.5-3.0 on the Richter scale) are noted annually. Every 18 months the fault releases a shock of 4.0 or more, capable of local minor damage. Magnitudes of 5.0 or greater occur about once per decade, can do significant damage and be felt in several states. The highest earth Read More Go to Site The San Andreas Fault -- USGS general interest publication (GIP) Votes:0 Text Only Version The San Andreas Fault by Sandra S. Schulz and Robert E. Wallace San Andreas fault in the Carrizo Plain, central California (Photo by Robert E. Wallace) Return to Information on Earthquakes Education and Inquiries Geologic Information VIEW a list of other USGS General Interest Publications This page is URL:http://pubs.usgs.gov/gip/earthq3/index.html Maintained by Eastern Publications Group Web Teamtson Last modified 06-24-97 (jmw) Read More Go to Site The San Andreas fault and the Bay Area Votes:0 The San Andreas Fault and the San Francisco Bay Area This image shows San Andreas Lake and Crystal Springs reservoir from the air, looking SouthEast from HERE. The highway paralleling the lakes to the left is Interstate 280, ``the most beautiful urban highway in the United States''. (And it is indeed very scenic.) This valley is remarkably straight because the San Andreas fault runs down its center. The San Andreas is a classic ``Strike Slip'' fault: the two sides (for the most part) move past each other horizontally. (San Francisco Bay is there at least partly because the block between the San Andreas on the West and the Hayward fault on the East has been downdropped a bit, but that motion is small compared to the tremendous horizontal displacements that have occurred along these faults.) Read More Go to Site UF3 Votes:0 Welcome to the UF 3 Home Page UF 3 is Utah Faults, Fluids, and Fractures - a consortium of researchers at Utah State University and the University of Utah who conduct research on one or more aspects of fault development, fluid flow in fractured or faulted rocks, structural analysis applied to hydrogeologic problems, and mathematical modelling of structures and fluid flow. Our work integrates geology, hydrogeology, mechanics, and probability to solve problems on the flow of fluids in rocks at a variety of scales. We collaborate with the petroleum and mining industry, government labs and geologic surveys, and researchers at other universities to investigate how fluids move through faulted and fractured rocks, and how faults evolve. Funding for our work comes from the Department of Energy, th Read More Go to Site Untitled Document Votes:0 Nature Notes from Big Creek, 1992 back to nature notes contents back to Big Creek home page January 1992 February 1992 March 1992 April 1992 May 1992 June 1992 July 1992 August 1992 October 1992 November 1992 January 1992 . This month we received a copy of the geology report Geology of the Point Sur-Lopez Point region, Coast Ranges, California: A part of the Southern California allochthon. This special paper of the Geological Society of America was written by Clarence Hall, a geologist at UCLA. Clarence spent several months at Big Creek in 1988, mapping the geological faults along the coast between Limekiln Creek and the Little Sur River. According to Clarence, the mapping was challenging not only because of the rugged, brushy landscape but because the land itself is so folded and unstable Read More Go to Site

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