Northridge, California M6.7

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Northridge, California (M6.7) - Depth range
about 3 to 11 miles -
Nisqually, Washington (M6.8) - Depth range about
30 to 36 miles -
10 30 50
Depth (Miles)
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ShakeMap Flowchart
INPUT
Earthquake Info
Ground Motion Amplitudes
ShakeMap Processing Modules
ShakeEmail
PAGER
PUSH
WWW Pages
OUTPUT
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What Controls the Distribution of Shaking?
Magnitude Higher magnitude requires a larger
fault, so more energy is released over a larger
area, and shaking lasts longer.
Great 1857 Fort Tejon(Magn. 7.8) earthquake length
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What Controls the Distribution of Shaking?
Magnitude
Distance from fault
Directivity
Soils (site conditions) amplify the shaking
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1989 Magnitude 6.9 Loma Prieta Earthquake- Damage
distant from the epicenter
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Example TriNet Station
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TriNet Station Equipment
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ShakeMap Input (Grid of points)
ftp Push

• SCEs Emiga System
• Knowledge of
• Crew Locations
• Substation Locations

Ground Motion Exceeds Threshold?
Page Facility Manager/Crew
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Used at Los Angles Co. Emergency Operations
Center, By LA County Office of Emergency
Management for Training Scenario, November 9,
2000.
LA County Emergency Operations Center
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What used to take hours, days, weeks, or even
months takes only minutes..
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The End
Questions?
U.S. Department of the Interior U.S. Geological
Survey
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Web Page Statistics
History from 08/01/99 -- 11/01/99
pasadena.wr.usgs.gov
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