J Ramn Arrowsmith

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New Looks at Active Faults Tectonic
Geomorphology using Airborne Laser Swath Mapping
(ALSM)
2 m DEM from ALSM
USGS 30 m DEM Matthes 1906 5 topographic map
High resolution topography along the San Andreas
Fault near Fort Ross, California (e.g., Prentice,
et al.)

• J Ramón Arrowsmith Chris J. Crosby
• Dept. of Geological Sciences, Arizona State
  University
• http//activetectonics.la.asu.edu
  ramon.arrowsmith_at_asu.edu

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Outline

• Point cloud analysis
• What is point cloud, why relevant?
• gt1 billion points, what do you do?
• Northern SAF example
• Information Technology partnership democratize
  access to ALSM data, including the the point
  cloud
• New look at old offset
• B4/1857 earthquake example

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R. Haugerud, U.S.G.S
ALSM workflow Survey-gtProcess-gtClassify-gtInterpol
ate/Grid-gtAnalyze
Interpolated productswhere most of us start
Geodesy and signal processing
D. Harding, NASA
Answer science question
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R. Haugerud, U.S.G.S
ALSM workflow Survey-gtProcess-gtClassify-gtInterpol
ate/Grid-gtAnalyze
Interpolated products
Geodesy and signal processing
D. Harding, NASA
Point Cloud x, y, zn, in
Answer science question
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Vegetation and ground returns at Mill Gulch
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Doda Ranch area with Matthes 1906 fault traces
6 DEM
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Doda Ranch area with Matthes 1906 fault traces
3 DEM
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The Vision

• Utilize the cyberinfrastructure developed by GEON
  to offer online data distribution, interpolation
  to grid, and analysis of large LiDAR datasets.
• Utilize modular web services to complete a
  variety of processing and analysis tasks.
• Completely internet-based workflow
• Point cloud to visualization
• Offer users control of interpolation and analysis
  parameters.

Conceptual GEON LiDAR Workflow
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GLW StatusCome and play!

• Continued software/middleware development
• Three datasets online
• Northern San Andreas Fault
• West Rainier Seismic Zone
• Eastern California Shear Zone NCALM / Mike
  Oskin PI
• Total of 2.5 billion LiDAR returns available
  via GLW.
• More data sets in the queue
• B4
• Hector Mine EQ
• NCALM Napa Valley
• Others

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Recent offsets in the Carrizo Plain -gt1857 and
earlier eq slip distn
1 m ALSM DEM (G. Hilley/NCALM)
Carrizo Plain aerial photograph Dots are Sieh
1978 recent offset tabulation Red lines are
Vedder and Wallace active fault traces
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Siehs offset 66 points, DEMs by kriging, and
point density
Two passes, 10004 pts
1 m grid
0.5 m grid
0.25 m grid
Shot density 0-11 m-1
One pass, 3800 pts
1 m grid
0.5 m grid
0.25 m grid
Shot density 0-5 m-1
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Simple offset estimate
0.5 m grid, single pass, krig DEM
From our database of the Sieh, 1978 observations
Only the beginning! Offsets by -Field Virtual
geologic interp -Simple profile matching (above)
-Fit channels/topography with simple forms half
cylinder, etc. -10s-100s m reach scale
multi-landform correlationdensify paleoslip
estimates
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Acknowledgments
http//lidar.asu.edu

• Link to GLW
• LVIZ
• listserv

• Adrian Borsa, Mike Bevis/Ken Hudnut/B4 team,
  David Harding, George Hilley, Dave Phillips,
  David Raleigh, Carol Prentice, Olaf Zielke
• ASU Active Tectonics group, GEON colleagues
• NASA/USGS ASLM data
• NSF
• USGS NEHRP
• SCEC