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CyberShake Project and ShakeMaps

CyberShake Project and ShakeMaps. CyberShake Project. CyberShake is a SCEC research project that is a physics-based high performance computational approach to Probabilistic S eismic H azard A nalysis (PSHA)

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CyberShake Project and ShakeMaps

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  1. CyberShake Project and ShakeMaps

  2. CyberShake Project • CyberShake is a SCEC research project that is a physics-based high performance computational approach to Probabilistic Seismic Hazard Analysis (PSHA) • It uses 3D seismic wave propagation simulations to predict ground motions produced by earthquakes • Supercomputers are used to run complicated algorithms that can help predict ground motions • Goal is to create maps that can predict how much the ground will move when a fault ruptures in different locations in Southern California

  3. Probabilistic Seismic Hazard Analysis (PSHA) • Help create maps of unstable zones based on historical records of fault ruptures • Combines the results of millions of vertical earthquake simulations into a map that will show the distribution of how different places will be affected • Requires two inputs • A velocity or earth structure model • An earthquake rupture forecast • The first input uses information about geologic structure of the soil which illustrates how fast seismic waves will travel though different soil and how much shaking will occur at a given location • The second input requires identifying the location of active faults and determine the recurrence interval for each fault

  4. High Performance Computing • High performance computation on supercomputers is required to make ShakeMaps • 180 million tasks were ran on a supercomputer at Texas Advanced Computing Center • By using high performance computing the CyberShake computational approach improves Probabilistic Seismic Hazard Analysis (PSHA) calculations • Wave propagation simulations can more accurately describe the ground motion distribution over a given location • Wave propagation simulations provide information about ground motion intensity and how long the shaking will last

  5. Creating Hazard Analysis Maps • The new hazard maps predict more shaking in the L.A. basin • Seismologist studied the soil in different locations to determine how the earthquake will affect each type of soil • Information of each fault is necessary for creating these maps • Scientists figured out the recurrence intervals of each active fault • In Southern California it is difficult to create these maps because of all the different soil and rock that exist beneath the surface

  6. Hazard Analysis Map Uses • These maps can predict how much the ground moves at different locations • Help illustrate which certain areas will be affected the most • Enable emergency response teams to determine what areas had the most damage • Engineers use these maps when constructing buildings that will be able to withstand the predicted amount of shaking

  7. ShakeMaps • ShakeMaps are created by the CyberShake project • Are geographic representations of ground motion made by an earthquake • Highlight the severity of ground shakes throughout the area around the epicenter • The map shows the distribution of shaking intensity which is color coded using Mercalli Intensity maps

  8. Interpreting ShakeMaps • Legend • Star: location of Epicenter • Colored triangles: indicate reporting stations • Table: Mercalli Intensity Scale rated by a roman numeral from one to twelve, twelve being the most shaking and damage

  9. How to Access ShakeMaps • General ShakeMaps • Go to www.usgs.gov • Click on the yellow “Hazards” near the top of the screen • Click on the “Earthquake Hazards” link • Click on the link next to the “ShakeMap: Maps Depicting Shaking Intensity” text • Specific earthquake ShakeMaps • Search the quake on Google and click a link that is from the USGS website (one of the first few links) • Click on the “Maps” tab towards the top of the screen • Click on the map titled “ShakeMap”

  10. Works Cited • Broadband Seismic Data Collection Center. “Glossary of Terms.” 23 Nov. 2010. Web. 20 July, 2011. <http://eqinfo.ucsd.edu/faq/glossary.php>. • USGS. “ShakeMaps.” 21 July 2011. Web. 20 July 2011. <http://Earthquake.usgs.gov/earthquakes/shakemap>. • SCECpedia. “CyberShake.” 14 July 2011. Web. 20 July 2011. < http://scec.usc.edu/scecpedia/CyberShake>. • Dubros, Aaron. “Tomorrow’s Forecast: Clear with a Chance of Tremors.” Texas Advanced Computing Center. 10 Feb. 2010. Web. 20 July 2011. < http://cms.tacc.utexas.edu/feature-stories/2010/clear-with-a-chance-of-tremors/>. • Texas Advanced Computing Center. “CyberShake.” University of Texas at Austin. Spring 2010. Web. 20 July 2011. < http://cms-prod.tacc.utexas.edu/fileadmin/templates/SubtacctemplateStaticDropdown/images/casestudies/CS_CyberShake.pdf>.

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