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2011 Gregor
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V/H Ratios from Megathrust Earthquakes
Nick Gregorg
Bechtel
November 4 2011November 4, 2011
COSMOS 2011 Technical MeetingCOSMOS 2011 Technical Meeting
Approaches for Vertical Ground Approaches for Vertical Ground Motions
Independent Vertical PSHA Requires Vertical GMPE (no subduction
models) Different controlling events from PSHA results
Scale Horizontal ground motions by V/H spectral ratio Consistency between Horizontal and Vertical
motions for given Scenario
Crustal Vertical GMPEs
Abrahamson and Silva (1997) Campbell (1997)p ( ) Sadigh et al. (1997) Campbell and Bozorgnia (2003)Campbell and Bozorgnia (2003) Ambraseys et al. (2005) NGA West 2 (in development) NGA West 2 (in development)
Crustal V/H Models
Bozorgnia and Campbell (2004) Ambraseys and Douglas (2003)y g ( ) Gulerce and Abrahamson (2011)
GA11 V/H ModelGA11 V/H Model(Earthquake Spectra, Nov. 2011)
Crustal NGA Dataset (M
Application for Megathrust Events
Magnitudes > 8+ Comparison with two recent earthquakesp q
2010 Chile (M8.8) 2011 Tohoku (M9.0)( )
2010 Chile Earthquake2010 Chile Earthquake
M8.8M8.8 Depth 35 km 26 stations Dist. 34-200km Vs30m 236-1,421m/s
from Hayes, NEIC
2010 Chile Earthquake PGA DiPGA vs. Distance
2010 Chile Earthquake PGA vs Vs30m
2010 Chile Earthquake T 1 0 DiT=1.0sec vs. Distance
2010 Chile Earthquake T=1.0sec vs Vs30m
2010 Chile Earthquake2010 Chile Earthquake
2011 Tohoku Earthquake2011 Tohoku Earthquake
M9.0 Depth 30 km 369 stations (K-Net,
Kik-Net)Di 44 989 k Dist. 44-989 km
Vs30m 107-1,433 m/s
from Hayes, NEIC
2011 Tohoku Earthquake PGA DiPGA vs. Distance
2011 Tohoku Earthquake PGA vs Vs30m
2011 Tohoku Earthquake PGA vs FA/BA
2011 Tohoku Earthquake T 1 0 DiT=1.0sec vs. Distance
2011 Tohoku Earthquake T=1.0sec vs Vs30m
2011 Tohoku Earthquake T=1.0sec vs FA/BA
2011 Tohoku Earthquake2011 Tohoku Earthquake
Summary
Preference of V/H ratios
Comparisons for 2010 Chile and 2011 Comparisons for 2010 Chile and 2011 Tohoku events
GA11 V/H Model applicable for large GA11 V/H Model applicable for large Megathrust events