Improving GNSS for Future Natural Disaster Reduction ...
Transcript of Improving GNSS for Future Natural Disaster Reduction ...
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Improving GNSS for Future Natural Disaster Reduction:Improving GNSS for Future Natural Disaster Reduction:
Earthquakes & TsunamisEarthquakes & TsunamisKenneth W. HudnutKenneth W. Hudnut
U. S. Geological SurveyU. S. Geological Survey
GNSS Science & Technology Applications
ICG-3
December 9, 2008Pasadena, California
GPS site & photoby J. GaletzkaMuloh, Sumatra
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May 1900 April 1906
Photos courtesy Carol Prentice, USGS
San Francisco - 5:12 AM on April 18, 1906San Francisco - 5:12 AM on April 18, 1906……
3000 people were killed; 225,000 of the 400,000 living in San Francisco were left homeless. Much of the city was in ruins.
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December 26, 2004 Sumatra-AndamanDecember 26, 2004 Sumatra-Andamanearthquake and Indian Ocean Tsunamiearthquake and Indian Ocean Tsunami
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Earthquakesare a globalproblem
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4
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1600 1700 1800 1900 2000
Population(billions)
Cumulative number ofearthquake
fatalities(millions)
Earthquake Fatalities andEarthquake Fatalities andPopulation GrowthPopulation Growth
Courtesy of Prof. Roger Bilham(University of Colorado)
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GNSS timing for precise earthquake locationGNSS timing for precise earthquake locationworldwide - also vital for tsunami alertsworldwide - also vital for tsunami alerts
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Courtesy of Prof. Tanya Atwater, UCSB
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Courtesy of Prof. Tanya Atwater, UCSB
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San Andreas faultSan Andreas fault• 35 mm/yr slip rate;
• >70% of plate motion• 1685, 1812, 1857 eq’s
• Big Bend compression• 1971 Sylmar (M 6.7)• 1994 Northridge (M 6.7)
• California is now veryheavily ‘wired’ with manyGPS stations
• GPS measures plate motionstrain accumulation andlarge earthquakedisplacements
• ‘Natural laboratory’ to studyfuture ‘Big Ones’
• B4 - Imaged by airborneLiDAR - GPS was crucial!
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ReidReid’’s theory of s theory of ““Elastic ReboundElastic Rebound””
Triangulation networks wereresurveyed in the 15 months followingthe 1906 earthquake.
H. F. Reid
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Mt. DiabloMt. Diablo
Surveyors measure the location of mountain peaksSurveyors measure the location of mountain peaks
Mt. Diablo
Pre-earthquake Post earthquake
Clayton
Mt. Hamilton Loma Prieta
Grizzly Peak
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GPS network measures platetectonic motions to anaccuracy of better than1 mm/yr
We can see whether themotion is ʻslow and steady,ʼor perhaps more interestinglyit may sometimes accelerateor decelerate
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San Andreas - place two betsSan Andreas - place two betsboth ~120 km from Los Angeles (LA)both ~120 km from Los Angeles (LA)
Coachella Valleysegment is ~60 kmto San Bernardino
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Lone Juniper Ranch and Frazier Park High SchoolLone Juniper Ranch and Frazier Park High School
Prototype GPS fault slip sensor; up to 10 Hz
Spans the SanAndreas faultnear Gorman,California
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"Good science, when applied in the way that the people of Alaska have"Good science, when applied in the way that the people of Alaska havedone, made the difference between an emergency and a tragedy."done, made the difference between an emergency and a tragedy."
Charles Charles GroatGroat, Director, United States Geological Survey, Director, United States Geological Survey
Each day, the Trans-Alaska oil pipeline carries one million barrels ofEach day, the Trans-Alaska oil pipeline carries one million barrels ofoil, about 17% of the domestic oil supply for the United States, valuedoil, about 17% of the domestic oil supply for the United States, valued
at about $25 million. If the pipeline had ruptured during the 2002 Denaliat about $25 million. If the pipeline had ruptured during the 2002 Denaliearthquake, the lost revenue and cost of repair and environmentalearthquake, the lost revenue and cost of repair and environmental
cleanup would have been incalculable.cleanup would have been incalculable.
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San Andreas - instrumentSan Andreas - instrument majormajorlifeline infrastructure crossingslifeline infrastructure crossings
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Cajon Pass I-15 Fault CrossingCajon Pass I-15 Fault Crossing
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Earthquake Early WarningEarthquake Early Warning
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Tangshan, China1976 - M 7.5255,000people died(official)
Northridge, CA1994 - it canhappen here
Turkey 1999
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Pre-earthquake:
Reference static displacementReference static rotationMean and variance of dynamic characteristics
During earthquake:
Changes in dynamic characteristicsHysteretic behaviorDamage initiation
Post-earthquake:
Permanent static displacementPermanent static rotationMean and variance of dynamic characteristics
Multiple sensor package:• Acceleration / Velocity• Displacement (GPS)• Rotation (tilt-meter)
AUTOMATED TAGGING AND REAL-TIME DAMAGE DISTRIBUTION MAPS
LinearNonlinear
Permanentdisplacement
FRC.
DISP.
Automated Tagging and Real-Time Damage Distribution Maps
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•Satellite
•Telemetry
•Internet
SENSOR PACKAGE
-Accelerometer
-Tiltmeter
-GPS sensor
REAL-TIME DAMAGE ASSESSMENT
Courtesy ofErdal Safak (USGS)
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Caltech Tectonic Observatory GPS Array: SuGArUSAID funds to upgrade to real-time GNSS
On-land GPS
stations are
essential for
real-time
detection of
large slip:
Blewitt et al.
(GRL, 2006)
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GNSS buoy systemsGNSS buoy systems NOAA DART buoys are expensive
and require regular maintenance GPS buoys developed by GFZ and
Univ. Tokyo groups GPS can be used for large numbers
of low-cost buoys to complementexisting system
NavCom-AXYS contract for USNavy (NAVOCEANO);2 cm inshore, 10 cm offshore
NOAA-USGS testing program forwarning application (MBARI)
Tie in with existing earthquakeand weather monitoring andalerts
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Padang Padang -- what to do?what to do?
Photo by John GaletzkaCaltech Tectonic Observatory
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Photo by John GaletzkaCaltech Tectonic Observatory
Inexpensive package of GPS/INS can be added (after R&D and testing)to existing NOAA buoys offshore of So. Calif. to complement otherInstrumentation for earthquake and tsunami early warning systems
SoCal - What to do?
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GNSS Benefiting Humanity:GNSS Benefiting Humanity:Earthquake and Tsunami safetyEarthquake and Tsunami safety
Global earthquake observation and tsunami alerts (ANSS) Airborne imagery positioning for fault zone characterization and damage assessment (B4) Tracking plates and strain accumulation and release (PBO) Earthquake early warning & rapid slip observation at lifeline fault crossings (Gorman SAF) Building monitoring and damage assessment; automatic ‘tagging’ (Factor Building) Fault displacement (SuGAr) and tsunami buoy measurement (MBARI)
GNSS will become even better than it is currently for these applications:– GPS L2C, L5 and L1C will improve over current capabilities (e.g., tri-laning)– GLONASS, QZSS, Galileo and other GNSS will help (e.g., increased coverage)
GNSS could be improved beyond currently planned system enhancements:– Aiding through internet or wireless will enhance real-time precise results– Added signals could nearly eliminate the real-time ambiguity resolution problem