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Development Group. Buddy Bernhard, Tarana Farhat , Ryan Lacey, Amy Lim, Sulaimon Paseda , Marshall Rogers- Mart í nez and Christine Sawyer. U SE IT Grand Challenge. 2011 - PowerPoint PPT Presentation
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Development Group
Buddy Bernhard, Tarana Farhat, Ryan Lacey, Amy Lim, Sulaimon
Paseda, Marshall Rogers-Martínez and Christine Sawyer
USEIT Grand Challenge2011
Develop a Seismic Sequence Visualization System based on SCEC-VDO and GIS that can display
earthquake sequences, monitor their evolution in space and time, and assess their hazards and risks.
Source: SCEC, Dr. Jordan, 2011
Development Goals from Grand Challenge
• Integration:– Develop a space-time visualization capability in
SCEC-VDO• Use radius coordinate to display time, rather than depth.
– GIS datasets as functional layers and overlays.• Capitalize on data teams collections of information.
• Enhanced surface imagery– Implementation of PNG files
• Allows for variable opacity.
Purpose
• GIS Layers– Present statistical information about a region visually to enhance understanding of earthquake risks by integrating statistical information with hazard information.
• Time-Space Display – Present earthquake sequences in 3 dimensions; time, longitude and latitude. Doing so allows us to understand earthquake sequence progression.
• Surface Imagery – Allows for adjustable transparency of images for enhanced understanding of topography in relation to sub-surface features.
Definitions
• Earthquake Hazard: The physical effects and subsequent consequences of an earthquake (landslides, sedimentary-basin shaking, tsunamis, ground liquefaction).
• Earthquake Risk: Probable building damage and number of people expected to be hurt or killed by an earthquake. (GIS data)
Implementation – GIS Data in Java 3D
• Jenks Natural Breaks Optimization– Compute mean and obtain sum of squared
deviations of each point:•
– Determine binning boundaries from the standard deviations from each point to bin mean:•
– Compute the Goodness of Variance Fit:•
Implementation – GIS Data in Java 3D
• Move points between bins until the GVF can no longer be increased (GVF approaches one as SDCM gets smaller and SDAM gets larger).
• Assign bins different colors according to values (for population bins with higher density get darker colors, less density, lighter colors)
Implementation – Time-Space Plugin
• Obtain dates of all earthquakes and load into memory.
• Normalize the range of earthquake dates to lie within the range R, with
• Normalization Algorithm for each ith earthquake:
Implementation – Time-Space Plugin
• Take each where S corresponds to the height of the total sequence in space.– If S=250, then the earthquakes would be displayed
in a range from the surface (0km) to the height S (250km). The altitude of an individual quake is with respect to its time of occurrence in relation to the total time elapsed of the earthquake catalog it is contained within.
Implementation – Surface Imagery
• Imported topographic maps and converted them into PNG files which are compatible with VDO. – Images modified to fit within the existing political
boundaries of the software. – Images now allow for adjustable opacity for
simultaneous display of sub-surface features with surface map.
ExamplesGIS Layers implemented for the Tōhoku earthquake sequence, showing population density (purple) as well as locations of nuclear power plants (green).
Examples
Space-Time plot implemented for the Sumatra sequence, displaying the number of days since the beginning of the sequence (first foreshock).