PRELIMINARY ANALYSIS OF NON-LINEAR SITE EFFECTS AT PORT ISLAND VERTICAL ARRAY STATION DURING THE 1995 HYOGOKEN-NAMBU EARTHQUAKE.

Access this Article

Search this Article

Author(s)

Abstract

A preliminary analysis was made of the propagation of seismic waves in a vertical array during the 1995 Hyogoken-nambu earthquake (M_<JMA> = 7.2). The vertical array is located on reclaimed land called "Port Island" about 17 km from the epicenter. We used the 1D Haskell linear method to simulate the motions at surficial stations (32,16,and 0 m) from the imposed motion given by records at the deeper station at 83m. The linear simulation satisfactorily explains the vertical component of the observed motions; but, both observed horizontal components are overestimated. Non-linear simulation was done to explain the behavior of the horizontal components. We used the finite-difference technique and step by step time integration for this simulation. With this method, the simulated and observed horizontal components are in good agreement, showing the strong influence of the non-linear effect in the horizontal components and the linear amplification of the vertical components. This provides a good explanation of why the vertical motions had disproportionate large amplitudes in comparison with the horizontal ones.

Journal

  • Journal of natural disaster science

    Journal of natural disaster science 16(2), 49-58, 1995-03

    Japanese Group for the Study of Natural Disaster Science

References:  8

Cited by:  4

Codes

  • NII Article ID (NAID)
    110002674193
  • NII NACSIS-CAT ID (NCID)
    AA10898116
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    03884090
  • Data Source
    CJP  CJPref  NII-ELS  NDL-Digital 
Page Top