ASU GEON NODE
J Ramón Arrowsmith
Department of Geological Sciences
Arizona State University, Tempe, AZ
http://activetectonics.la.asu.edu
[email protected]
Outline
• (Active) Fault databases and fault system
visualization
• Digital topography use scenarios
– Hydro1K (1 km)
– Shuttle Topography Mission and National Elevation
Dataset (30 m)
– Airborne Laser Swath Mapping (1 m)
• Ideas for online digital elevation data and
(satellite) imagery
Digital (active) fault databases
and fault visualization
• Typical shapefile fault “databases”
– USGS active faults
– California Geological Survey
• Fault databases in development (incomplete list)
– Colorado Geological Survey [Access2000]-http://geosurvey.state.co.us/pubs/ceno/index.htm
– Fault Database for Southern California (Donnellan, et
al.) [MySQL]--http://infogroup.usc.edu:8080/Fault_Da.doc
– SCEC/SCEC-ITR: Fault Activity Database, Fault
Information System, Community Fault/Block/Velocity
Models
Southern California Earthquake Center
LA3D-Java--based structural visualization of
Community Fault Model (CFM); GeoWall capable
Digital topography use scenarios
HYDRO1K
• Developed from
GTOPO30 (30 arcsecond—1 km-DEM)
• Reprojected,
hydrologically
corrected
• http://edcdaac.usgs.g
ov/gtopo30/hydro/
HYDRO1K plotted with ArcMap
Rockies Testbed
Rockies Testbed
GTOPO30, ANSS seismicity plotted with GMT
84549 eqs!
Mid Atlantic Testbed
National Elevation Dataset
(NED) & Shuttle Radar
Topography Mission (SRTM)
• NED—merged, seamless, “best available” 10 or
30 m digital elevation data (mostly 7.5 minute
DEM source data)
• SRTM—C and X band interferometric synthetic
aperture radar for topographic data acquisition
over 80% of earth landmass on 11 day shuttle
mission (Feb. 2000). Significant processing for 30
m data. Unedited output from processor.
SRTM and NED downloads
• http://seamless.usgs.
gov
• ~1x1 degree tiles for
SRTM were
~100Mb; for NED
80 Mb. Total for
Rockies = 14.4 Gb
• Merge and reduce
precision (mm to
mm) produces three
1 Gb swaths across
the Rockies testbed.
1/3” NED (10 m data): 83 Gb
Wasatch
NED versus SRTM
Grand Canyon
NW Montana
Airborne Laser Swath Mapping
(ALSM)
• Allows for the measurement of surface
topographic features with decimeter-level
accuracies.
• AKA Light Detection and Ranging (LIDAR)
• Powerful tool for surface process studies because
it allows for the characterization of the landscape
at the appropriate scale
• Data intensive!
• National Center for Airborne Laser Mapping
(NCALM)—recently funded NSF project for
coordinated research grade ALSM data
Ideas for online digital elevation
data and (satellite) imagery
http://seamless.usgs.gov/
DEMs
https://zulu.ssc.nasa.gov/mrsid/
+
Landsat TM 742
Or
ASTER …
ASTER-SW
scenes
of 04/03/2003)
ASTER
images
for(asthe
southern
Rockies
Each is ~118Mb ; total here is ~81 Gb
“on-the-fly” processing of user selected ASTER image with
JAVA front end to IDL
Remote sensing
application for geological
mapping
Conclusions
• Collaboration is appropriate with SCEC for Fault
representation and visualization efforts
• DEM analysis is data processing intensive
• Opportunity to link online elevation and imagery
databases
• Other data/efforts:
– Paleoearthquakes
– Late Cenozoic vertical motions (exhumation and
basins)
– Focal mechanisms (Harvard/USGS have <20)