Open AccessIrpinia, Italy, 1980 earthquake: waveform modelling of strong motion data
Author(s) -
Suhadolc P.,
Panza G. F.,
Vaccari F.
Publication year - 1990
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1990.tb05575.x
Subject(s) - waveform , geology , seismology , amplitude , envelope (radar) , acceleration , time domain , displacement (psychology) , peak ground acceleration , geodesy , earthquake simulation , ground motion , computer science , physics , quantum mechanics , psychology , telecommunications , radar , classical mechanics , psychotherapist , computer vision
SUMMARY Several strong motion records of the Irpinia (southern Italy) 1980 earthquake have been modelled for a total time duration of about 180 s with the use of the multimode summation of waves of P—SV and SH type. If waveform modelling is applied to unfiltered accelerations the best that can be done, at present, is amplitude envelope matching in time and frequency domain. The early phase of the studied event can be synthesized by 12 main episodes of different sizes, modelling the rupturing process. The space‐time distribution of such episodes suggests that the rupturing process did propagate in a bilateral fashion. This model of the seismic source gives rise to synthetic velocity records which match quite well the experimental ones. To avoid the problems connected with the large instability of displacements obtained from direct numerical integration of observed accelerograms, the synthetic signals can be first used to perform acceleration or velocity fitting of experimental data; an estimate of the ground displacement above 1 Hz can then be obtained by analytical integration of the synthetic velocities.