Signal processing and spectral analysis of the aftershocks of the 1980 El Asnam, Algeria earthquake-engineering application

Details Signal processing and spectral analysis of the aftershocks of the 1980 El Asnam, Algeria earthquake-engineering application Signal processing and spectral analysis of the aftershocks of the 1980 El Asnam, Algeria earthquake-engineering application

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...38..174m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 38, Issue 2-3, p. 174-188.

Physics

1

Scientific paper

Seismic recording stations were set up in the El Asnam region of Algeria by the Department of Nuclear Safety of the French Atomic Energy Commission (CEA/IPSN) after the severe October 10, 1980 earthquake, to study the aftershocks of this important event. Three of these stations, equipped with SMA-1 instruments, were intended to record strong ground motion and were accordingly installed near the trace of the fault responsible for the main shock. Three other more sensitive stations were placed in such a way as to make up a small network enclosing the central portion of this fault. Over 400 events were thus recorded during October and November 1980, of which certain events presented accelerations of nearly 0.2g. The SMA-1 recordings were used as a basis for comparing different methods of correcting time histories, demonstrating the influence of the digitization rate, especially upon the high-frequency elements of the ground acceleration and that of the type of low-frequency filtering upon the integrated velocity and displacement time histories. The most significant recordings from both types of station were processed and their response spectra computed. From recordings of the same earthquake obtained on a massive concrete slab and in the free field, a marked filtering effect in the high-frequency range is to be observed.

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