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  • Regional Bulletin - NORSAR
    MONITORING INFRASOUND Regional Bulletin Regional Bulletin We continue our work towards developing and evaluating a joint seismic infrasonic bulletin for northern Fennoscandia and adjacent regions This bulletin would be similar to the automatic seismic bulletin that we are currently providing on the NORSAR Web pages but it would also contain infrasonic phase associations Some illustrations of initial results are presented below Events where no infrasound signals were observed by ARCES or Apatity The map shows the 651 automatically located events GBF during a period of about one year for which either the ARCES seismic array or the Apatity infrasound array observed infrasound signals The blue triangles show the GBF event locations and the red stars show the location of known sites with explosions either at the Earth s surface or in the atmosphere Note that the automatic GBF locations usually scatter over a larger area around these source regions Also note that the GBF locations employ a fixed grid and that many of the grid points shown on the map have a large number of corresponding events Events for which ARCES Apatity observed infrasound signals This map is similar to the previous map and shows the 68 automatically located events

    Original URL path: http://www.norsar.no/Contents.aspx?PageUrl=monitoring%2finfrasound%2fRegional-Bulletin%2f (2016-02-03)
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  • Search
    norsar about us Publications 2009 Books Chapter in bookBenito M C Lindholm E Camacho A Climent G Marroquin E Molina W Rojas E Talavera J J Es Read More 2010 norsar about us Publications 2010 Books Chapter in bookPolom U L Hansen S Sauvin J S L Heureux I Lecomte C M Krawczyk M Vanneste O Long Read More 2010 norsar about us News 2010 Read More 2011 norsar about us News 2011 Read More 1 2 3 4 5 6 7 8 9 10 51 Articles found Title Achilles Joint Qualification System norsar about us News 2012 Achilles Read More AGU Fall 2009 microearthquake session norsar about us News 2009 AGU Fall 2009 microearthquake session NORSAR organizes session on microearthquakes at this years AGU Fall meeting in San Francisco Interested scientists are invited to submit manu Read More Announced Nuclear Test by North Korea norsar about us News 2009 Announced Nuclear Test by North Korea The NORSAR observatory recorded today 25 May 2009 at 01 04 24 GMT seismic signals from a presumed underground nuclear test in North Korea The test Read More Annual Report 2013 norsar about us News 2014 Annual Report 2013 Read More Arctic seismology session at ESC 2010 norsar about us News 2010 Arctic seismology session at ESC 2010 Call for Abstracts NORSAR and the Institute of Geophysics of the University of Warsaw would like to call for contributions to the followi Read More Avdelingsleder for Seismologi og Prøvestanskontroll norsar about us Careers stb manager Vi søker en dyktig avdelingsleder til vår avdeling for Seismologi og Prøvestanskontroll med evnen til å motivere til gode resultater Read More CO2 Storage Monitoring norsar about us News 2009 CO2 Storage Monitoring The key requirement to a safe storage of CO2 is to be constantly aware of the position

    Original URL path: http://www.norsar.no/search.aspx?Page1=1&Page=1&PageUrl=monitoring%2fsearch%2f1%2f1%2f (2016-02-03)
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  • NORSAR
    seismic signals from the announce Read More Two year position in microseismic monitoring Due to a significant increase in project activities NORSAR is announcing an opening for a two year position within Microseismic Read More NORSAR Synthetic 3D Seismic 2 0 for Petrel The NORSAR Synthetic 3D Seismic 2 0 plug in for Petrel is now available in the Ocean Store Read More Dimensjonering for jordskjelvlaster Sløser vi penger på dimensjonering for jordskjelvlaster i Norge Read More SeisRoX 3 0 2 is released SeisRoX version 3 0 2 is released Version 3 0 2 is a maintenance release with a focus on improving data import and upgrading the Read More How to videos Watch our new HOW TO videos Read More NORSAR 3D 5 7 2 is released NORSAR 3D 5 7 2 is released 5 7 2 is a maintenance release with improvements in functionality and stability Read More NORSAR 2D 5 3 1 NORSAR 2D 5 3 1 is released Read More 1 2 3 4 5 6 SEISMIC MODELLING MICROSEISMIC MONITORING EARTHQUAKE ENGINEERING NUCLEAR TEST MONITORING NORSARDATA NO JORDSKJELV NO Advanced software solutions and consulting services for the E P industry Solutions for locating and characterizing micro

    Original URL path: http://www.norsar.no/norsar/home/?docid=14&PageUrl=monitoring%2fhome%2f (2016-02-03)
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  • up to 5 from mid ocean ridges The figure shows the distribution of seismicity worldwide from 1973 to 2007 The the earthquake depth is indicated by the color scale Data provided by USGS Figure plotted using GMT At the Earth s surface earthquakes manifest themselves by a shaking and sometimes displacement of the ground When a large earthquake epicenter is located offshore the seabed sometimes suffers sufficient displacement to cause a tsunami The shaking in earthquakes can also trigger landslides and occasionally volcanic activity Seismic waves released by earthquakes are generally recorded with seismometers and analyzed to report for example the moment magnitude of an earthquake The Richter magnitude was developed in 1935 by Charles Richter and Beno Gutenberg at the California Institute of Technology Since it is a logarithmic scale an increase of one magnitude implies a tenfold increase in shaking amplitude The intensity of shaking is generally measured on the modified Mercalli scale In its most generic sense the word earthquake is used to describe any seismic event whether a natural phenomenon or an event caused by humans that generates seismic waves Earthquakes are caused mostly by rupture of geological faults but also by volcanic activity landslides mine

    Original URL path: http://www.norsar.no/seismology/print/570/0/ (2016-02-03)
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  • EARTHQUAKES
    EARTHQUAKES Earthquakes An earthquake is the result of a sudden release of energy in the Earth s crust that creates seismic waves The distribution of earthquakes on the Earth is not random but concentrates in belts which correspond to the three existing kinds of lithospheric plate boundaries compressional subduction zones continent continent collision extensional mid ocean ridges and transforms In terms of seismic energy approximately 98 are released at plate boundaries and thereof 80 originate from subduction zones 15 from continent continent collisions and up to 5 from mid ocean ridges The figure shows the distribution of seismicity worldwide from 1973 to 2007 The the earthquake depth is indicated by the color scale Data provided by USGS Figure plotted using GMT At the Earth s surface earthquakes manifest themselves by a shaking and sometimes displacement of the ground When a large earthquake epicenter is located offshore the seabed sometimes suffers sufficient displacement to cause a tsunami The shaking in earthquakes can also trigger landslides and occasionally volcanic activity Seismic waves released by earthquakes are generally recorded with seismometers and analyzed to report for example the moment magnitude of an earthquake The Richter magnitude was developed in 1935 by Charles Richter and Beno Gutenberg at the California Institute of Technology Since it is a logarithmic scale an increase of one magnitude implies a tenfold increase in shaking amplitude The intensity of shaking is generally measured on the modified Mercalli scale In its most generic sense the word earthquake is used to describe any seismic event whether a natural phenomenon or an event caused by humans that generates seismic waves Earthquakes are caused mostly by rupture of geological faults but also by volcanic activity landslides mine blasts nuclear experiments and production injection in hydrocarbon reservoirs The approximate energy equivalents of earthquakes in

    Original URL path: http://www.norsar.no/Contents.aspx?PageUrl=seismology%2fEarthquakes%2f (2016-02-03)
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  • Pyhäsalmi Ore Mine - NORSAR
    stopes and passes has been surveyed by laser scanning and a model has been built using a mine design software The figure shows a model of Pyhäsalmi ore body the surrounding infrastructure and the seismic stations Most seismic activity is observed close to KN1 which is a pass for quarried ore The seismic network The monitoring network within the Pyhäsalmi mine consists of 18 sensors including 6 three component stations leading to source receiver distances of 60 to 400 m The geophones are cemented in 10 5 m long boreholes that were drilled vertically in the roof of the tunnels The installation was performed by ISS Integrated Seismic System International Ltd South Africa and the monitoring is conducted routinely by Inmet Mining Co NORSAR obtains data for scientific purposes from the seismic monitoring network by courtesy of Inmet Mining Co and a good part of the microseismic monitoring software MIMO was developed using these data sets The network has been operational in a continuous mode since January 2003 and until March 2004 about 18 000 events were detected About two thirds of those events were identified as mining blasts the remaining events are microseismic activity The range of moment magnitudes is 1 8 to 1 2 but most events have moment magnitudes from 1 5 to 0 5 In general sampling rates of the geophones are 3000 Hz with occasional down sampling to 1000 or 500 Hz Beside the automatic location of events and analysis of source parameters we currently work on analysis methods related to both travel paths and source mechanism We use the 3D finite difference code E3D from Larsen and Schultz 1995 to calculate full waveforms for waves traveling through the mining infrastructure including the host rock the ore body tunnels and cavities The figures shows the

    Original URL path: http://www.norsar.no/seismology/print/657/0/ (2016-02-03)
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  • Pyhäsalmi Ore Mine - NORSAR
    contacts have been identified as possible fault planes Furthermore severe shearing has occurred in the geological past in Pyhäsalmi and active faults exist outside the current mining area and near the surface The complete mining infrastructure including tunnels stopes and passes has been surveyed by laser scanning and a model has been built using a mine design software The figure shows a model of Pyhäsalmi ore body the surrounding infrastructure and the seismic stations Most seismic activity is observed close to KN1 which is a pass for quarried ore The seismic network The monitoring network within the Pyhäsalmi mine consists of 18 sensors including 6 three component stations leading to source receiver distances of 60 to 400 m The geophones are cemented in 10 5 m long boreholes that were drilled vertically in the roof of the tunnels The installation was performed by ISS Integrated Seismic System International Ltd South Africa and the monitoring is conducted routinely by Inmet Mining Co NORSAR obtains data for scientific purposes from the seismic monitoring network by courtesy of Inmet Mining Co and a good part of the microseismic monitoring software MIMO was developed using these data sets The network has been operational in a continuous mode since January 2003 and until March 2004 about 18 000 events were detected About two thirds of those events were identified as mining blasts the remaining events are microseismic activity The range of moment magnitudes is 1 8 to 1 2 but most events have moment magnitudes from 1 5 to 0 5 In general sampling rates of the geophones are 3000 Hz with occasional down sampling to 1000 or 500 Hz Beside the automatic location of events and analysis of source parameters we currently work on analysis methods related to both travel paths and source mechanism

    Original URL path: http://www.norsar.no/Contents.aspx?PageUrl=seismology%2fEarthquakes%2fMicroseismicMonitoring%2fPyhasalmi%2f (2016-02-03)
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  • SAFOD - NORSAR
    Carrizo plain picture Ian Kluft The San Andreas Fault Observatory at Depth SAFOD is part of the Earthscope project investigating the structure and evolution of the North American continent especially physical processes controlling earthquakes and volcanic eruptions It is funded by US NSF USGS and ICDP The drill site is situated at the Northern end of the rupture zone of the 1966 Parkfield earthquake magnitude 6 and the borehole with a length of 3 2 kilometers reaching in the San Andreas fault at the location of a repeating microearthquake source is drilled in several stages pilot hole in 2002 three stages of Main hole drilling from 2004 2007 see figure below The figure shows a map of California with the San Andreas Fault and indicates the surface traces of historic large earthquakes The SAFOD drill hole is located close to the town of Parkfield just at the SE end of the creeping and microseismically active segment of the San Andreas Fault blue line The inset shows a sketch of the SAFOD drilling plan of the pilot and main hole superimposed on electrical resistivity structure Source http www nsf gov SAFOD provides a unique opportunity to bridge the gap between observations

    Original URL path: http://www.norsar.no/seismology/print/656/0/ (2016-02-03)
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