G-16 Ground Motion Prediction Equations for the Central and Eastern North America
Abstract eng: New ground motion prediction equations (GMPE) G-16 model for the Central and Eastern North America (CENA) is presented. The model is developed following the modular filter based approach introduced by Graizer and Kalkan [1, 2] for active tectonic environment in the Western US (WUS). The G-16 model is based on the Next Generation Attenuation database for the CENA (NGA-East) for the horizontal peak ground acceleration and 5%-damped pseudo spectral acceleration RotD50 component (Goulet et al., [3]). A subset of 5026 data points from this database with moment magnitudes M≥3.75 and fault distances Rrup≤1000 km was used to constrain the G-16 model. The dataset includes 48 earthquakes from different regions in the CENA not distinguishing between the Mid-Continent and Gulf Coast regions. Mid-Continent data dominate the dataset. In contrast to the active tectonic environment the database for the CENA is not sufficient for creating purely empirical GMPE covering the range of magnitudes and distances required for seismic hazard assessments. Recordings in the NGA-East database are sparse and cover mostly range of M<6.0 with limited amount of near-fault recordings. For M≥6 the G-16 model was adjusted based on a combination of 1) ratios of amplitudes of earthquakes from the NGA-East and NGA-West databases, 2) average stress-drop ratio between WUS and CENA, and 3) recently performed ground motion simulations. The functional forms of the G-16 GMPEs are derived from filters—each filter represents a particular physical phenomenon affecting the seismic wave radiation from the source. Main changes in the functional forms for the CENA relative to the WUS model (Graizer and Kalkan [4]) are a shift of maximum frequency of the acceleration response spectrum toward higher frequencies and an increase in the response spectrum amplitudes at high frequencies. Site correction was developed based on multiple runs of representative VS30 profiles through SHAKE-type equivalent-linear programs using time histories and random vibration theory (RVT) approaches. Site amplification functions are calculated for different VS30 relative to hard rock definition used in nuclear industry (Vs=2800 m/s). The number of model predictors is limited to a few measurable parameters: moment magnitude M, closest distance to fault rupture plane Rrup, average shear-wave velocity in the upper 30 m of the geological profile VS30, and anelastic attenuation factor Q0. Incorporating anelastic attenuation Q0 as an input parameter allows adjustments based on the regional crustal properties. The model covers the range of moment magnitudes 4.0
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
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Record created 2017-01-18, last modified 2017-01-18
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