Simulation of subsea seismic ground motions
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© 2017 Taylor & Francis Group, London. Seismic motions at seafloor are different from those at onshore sites since seawater can significantly suppress the seafloor vertical motions at the P-wave resonant frequencies of the seawater layer. Seawater layer also indirectly influences the seafloor motions as it changes the water saturation level and pore pressure of subsea soil layers. This paper summarizes some recent developments on the study of characteristics of subsea ground motions, and simulations of seismic motions at seafloor for use in seismic response analysis of offshore structures. The theoretical seafloor transfer functions are presented first. Procedures of simulating seafloor motions from the base rock motion spectrum or using onshore earthquake recordings are introduced. A numerical example is provided following the corresponding theoretical background in each section to demonstrate the procedure. The procedures can be used to simulate seafloor motions that can be used as inputs in the seismic response analysis of offshore structures.
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Li, C.; Li, H.; Hao, Hong; Bi, Kaiming (2018)Compared to the seismic motions recorded on the onshore sites, the quantity of offshore earthquake recordings is very limited. This paper presents a novel method to simulate spatially varying ground motions at multiple ...
Li, C.; Li, H.; Bi, Kaiming; Hao, H. (2017)This paper proposes a simulation method of three-component seafloor seismic motions using onshore earthquake recordings. Firstly, a pair of onshore and seafloor motions recorded during one earthquake is selected; the ...
Li, C.; Hao, Hong; Li, H.; Bi, Kaiming (2015)This paper proposes a modelling and simulation method of seafloor seismic motions on offshore sites, which are composed of the base rock, the porous soil layers and the seawater layer, based on the fundamental hydrodynamics ...