Open AccessObservation of a directed resonance in soil driven by transverse rock motion
Author(s) -
W. R. Stephenson
Publication year - 1989
Publication title -
bulletin of the new zealand society for earthquake engineering/nzsee quarterly bulletin
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.917
H-Index - 36
eISSN - 2324-1543
pISSN - 1174-9857
DOI - 10.5459/bnzsee.22.2.81-89
Subject(s) - geology , transverse plane , alluvium , acceleration , peak ground acceleration , resonance (particle physics) , mode (computer interface) , seismology , ground motion , geotechnical engineering , physics , geomorphology , atomic physics , classical mechanics , engineering , structural engineering , computer science , operating system
One component of horizontal ground acceleration recorded on flexible soil during the 1968 November 1 Cook strait earthquake is shown to be well modelled as a single degree of freedom oscillator excited by the recorded component of transverse acceleration in nearby bed rock. This is shown to be consistent with the cellular resonant mode hypothesis of seismic response of flexible soil. The mechanical oscillator is identified as a layer of fine-grained, post-glacial alluvium of approximately 20 m thickness.