Ground-Motion Attenuation Relationships for Cascadia Subduction Zone Megathrust Earthquakes Based on a Stochastic Finite-Fault Model - PowerPoint PPT Presentation

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Ground-Motion Attenuation Relationships for Cascadia Subduction Zone Megathrust Earthquakes Based on a Stochastic Finite-Fault Model

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Ground-Motion Attenuation Relationships for Cascadia Subduction Zone ... Rock (Columbia River Basalt), Soil site Conditions. Q(f) = 380f0.39 (Atkinson, 1995) ... – PowerPoint PPT presentation

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Title: Ground-Motion Attenuation Relationships for Cascadia Subduction Zone Megathrust Earthquakes Based on a Stochastic Finite-Fault Model


1
Ground-Motion Attenuation Relationships for
Cascadia Subduction Zone Megathrust Earthquakes
Based on a Stochastic Finite-Fault Model
  • Nick Gregor1, Walter Silva1, Ivan Wong2, and Bob
    Youngs3
  • 1 Pacific Engineering and Analysis
  • 2 URS Corporation
  • 3 Geomatrix Consultants

Pacific Northwest Workshop for USGS Hazard
Maps Seattle Washington, March 28-29, 2006
2
Outline
  • Stochastic Finite-Fault Model
  • Model Validation
  • Rock and Soil Profiles
  • Ground Motion Comparisons
  • Model Updates

3
Stochastic Finite-Fault Model
4
Model Validation
  • 1985 Michoacan, Mexico Earthquake (M8.0)
  • 14 rock sites
  • Distances 15 - 251 km
  • 1985 Valpariso, Chile Earthquake (M7.9)
  • 6 rock sites
  • Distances 39 - 119 km

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Michoacan Earthquake
6
Michoacan Earthquake
7
Michoacan Earthquake
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Valpariso Earthquake
9
Valpariso Earthquake
10
Modeling Bias
11
Cascadia Finite-Fault Model
  • M 8.0, 8.5, 9.0
  • Fault lengths 150, 450, and 1,100 km
  • Fault Width 90 km
  • Dip Angle 9o
  • 16 Site Locations (Center limb, South limb)
  • Rock (Columbia River Basalt), Soil site
    Conditions
  • Q(f) 380f0.39 (Atkinson, 1995)
  • Crustal Model (Trehu et al., 1994 Cohee et al.,
    1991 Ludwin et al., 1991)

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Attenuation Model Update
  • Non-linear Site Response Model from PEER NGA
    (Walling and Abrahamson, 2006)
  • Reference Rock Vs30m1,100 m/sec
  • Vs30m range 270 - 2,830 m/sec
  • Depth range 30 - 1,000 feet
  • EPRI and Penisular Soil Curves
  • Input Rock PGA range 0.01 - 1.5 g

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PGA
39
T0.3 sec
40
T1.0 sec
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