Merging geodesy and geology: SCIGN, laser topographic mapping …. … and some aspects of the 1999 Hector Mine earthquake. Ken Hudnut USGS Pasadena, California. CSUN Northridge, California April 23, 2002. The major objectives of the SCIGN array are:.
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… and some aspects of the1999 Hector Mine earthquake
April 23, 2002
of any network in the world…”– Tom Herring, 6/19/01
Scientific Director, UNAVCO
at the 2001 SCIGN Annual Meeting
High resolution topography along surface rupture of the October 16, 1999 Hector Mine, California Earthquake (Mw7.1) from Airborne Laser Swath Mapping
HUDNUT, K. W., U. S. Geological Survey
BORSA, A., IGPP/SIO, UCSD
GLENNIE, C., Aerotec LLC
MINSTER, J.-B., IGPP/SIO, UCSD
In press, Bulletin of the Seismological Society of America
Special Issue on the Hector Mine earthquake (2002)
Laser scan of land
surfaces and urban
buildings & lifelines
- damage assessment
ALSM – 9/11/01 NYC
LANDSAT 7 – earthquake damage - Bhuj, India
Pre- and post-disaster images can be differenced to measure damage and track recovery
Photo by Paul ‘Kip’ Otis-Diehl,
USMC, 29 Palms
Geolocation Vectors and Error Sources
Vector from CMearth to GPS phase center
Magnitude & directional errors both are
stochastic, time and location variant.
Vector from GPS phase center to laser
Magnitude error is constant if no airframe
flexing. Directional error due to constant
and time-varying biases in INS.
Vector from laser to ground footprint
Magnitude error due to timing, instrument
and atmospheric delays. Directional error
from constant mirror mounting offsets and
time-varying biases in reporting of scan
angles (both pitch and roll).
Note: additional errors due to imperfect
synchronization of GPS, INS, mirror scan
and laser firing times must be modeled
and removed as well.
Calibration maneuvers at Hector Mine and Lavic Lake
dry lake bed for calibrations
(blue lines are
Roll & Pitch
compared with geologic estimates, InSAR and other methods