Map Book Gallery Volume 22
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Los Alamos, New Mexico, USA
By Richard E. Kelley
- Contact
- Richard E. Kelley
- Software
- ArcGIS Desktop 9.1, ArcGIS Spatial Analyst, ArcGIS 3D Analyst
- Printer
- HP Designjet 5500
- Data Source(s)
- USGS and other public data
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As part of the Yucca Mountain Probabilistic Volcanic Hazard Analysis (PVHA) Project, small Quaternary (0.3–1.0 Ma) volcanoes in the vicinity of the proposed Yucca Mountain repository were studied. Included were calculations of the erupted magma volume for each volcano. ArcGIS Desktop with ArcGIS 3D Analyst was used to perform this task. The steps used in making the calculations and 3D graphic representations of the volcanoes are displayed in this map.
Process Steps
1. The geological extent of the basalt cone/flow is defined from published geologic maps or air photo data and used as a mask to extract a "top of basalt" raster from 10-meter
digital elevation model (DEM) data.
2. The outline of the basalt extent is converted to three-dimensional points. From this, a triangulated irregular network (TIN) is created, representing an approximation of the topographic surface that was present prior to eruption.
3. The TIN is then converted to a raster surface representing the base of the erupted basalt.
4. The base elevation raster is then subtracted from the top of basalt raster, resulting in a “thickness” raster. The volume of basalt is calculated with the Area and Volume Statistics tool in ArcGIS 3D Analyst.
Courtesy of Los Alamos National Laboratory, EES-9. |
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