The 25 November 1988 Saguenay, Quebec, earthquake: source parameters and the attenuation of strong ground motion

P. G. Somerville, J. P. McLaren, C. K. Saikia, D. V. Helmberger

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56 Citations (Scopus)

Abstract

The Saguenay earthquake of 25 November 1988 occurred close to the S margin of the Saguenay Graben in S Quebec. It was caused by almost purely dip-slip faulting centered at a depth of 26km with a P axis oriented NE-SW. The estimated seismic moment is 5×1024 dyne-cm, corresponding to a moment magnitude of 5.8. The source duration of the earthquake is estimated to be 1.8sec, corresponding to a stress drop of 160 bars. The set of strong-motion recordings has been used to validate a procedure for estimating strong ground motion attenuation based on a simple wave propagation model. Similar studies of earthquakes in other regions of E North America indicate that the strength of the postcritical reflections, and the distance ranges over whch they are dominant, are controlled by the focal depth and crustal structure. Regional variations in crustal structure thus give rise to predictable regional variations in strong ground motion attenuation. -from Authors

Original languageEnglish
Pages (from-to)1118-1143
Number of pages26
JournalBulletin - Seismological Society of America
Volume80
Issue number5
Publication statusPublished - 1990
Externally publishedYes

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