A Ground Motion Prediction Model for Deep Earthquakes beneath the Island of Hawaii. Issue 3 (August 2015)

• Record Type: Journal Article
• Authors: Wong, Ivan G.; Silva, Walter J.; Darragh, Robert; Gregor, Nick; Dober, Mark
• Is Part Of: Earthquake spectra. Volume 31:Issue 3(2015)
• Page Start: 1763
• Page End: 1788
• Publication Date: 2015-08
• Subjects: Earthquake engineering -- Periodicals; Earthquake engineering; Periodicals; 624.1762
• DOI: 10.1193/012012EQS015M
• Languages: English
• ISSNs: 8755-2930

Abstract

Until recently, no ground motion prediction model was available for deep ( > 20 km) Hawaiian earthquakes, including the 2006M 6.7 Kiholo Bay earthquake. We developed such a model based on the stochastic point-source model. Strong motion data from the 2006 event and 15 other deep Hawaiian earthquakes ofM 3.3 toM 6.2 were inverted using a nonlinear least-squares inversion of Fourier amplitude spectra to estimate stress drops for input into the stochastic modeling and for the few larger events (M ≥ 5.0), to calibrate the ground motion prediction model. The ground motion model is valid forM 3.5 toM 7.5 over the Joyner-Boore ( RJB ) distance range of 20 km to 400 km and are for 5%-damped horizontal spectral acceleration at 27 periods from PGA (0.01 s) to 10.0 s. The shallow site condition assumed for the model is soil and weathered basalt with a mean VS 30 of 428 m/s.