Location
St. Louis, Missouri
Presentation Date
01 May 1981, 9:00 am - 12:00 pm
Abstract
Soon after the main shock of Friuli, Italy, May 6th 1976 earthquake, two strong motion recorders accelerographs were installed in two sites about 650 meters distant one from the other. One instrument was installed on hard outcropping rock, the other at the surface of an alluvial deposit 20+25 meters thick underlain by a sloping bedrock. Among the numerous records obtained three aftershocks of magnitude about 6 and hypocentral distance within 20 Km, are investigated by comparing maximum accelerations, durations, Arias intensity and Husid ratios. A new numerical tool is proposed which consists of a series of plots of the Husid ratios of low-pass filtered accelerograms. The numerical tool seems to be very promising since it allows to describe at the same time energy, duration and frequencies content, of a given ground motion. Moreover the application to the records simultaneously obtained at the two stations suggests that it would be more appropriate to define an accelerogram according to the type of "behavior" shown by the site during a certain earthquake rather than according to the local site characteristics like soft or hard.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
1st International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1981 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Basili, M.; Gorelli, V.; and Muzzi, F., "Local Site Behaviour in the 1976 Friuli Earthquake" (1981). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 4.
https://scholarsmine.mst.edu/icrageesd/01icrageesd/session08/4
Included in
Local Site Behaviour in the 1976 Friuli Earthquake
St. Louis, Missouri
Soon after the main shock of Friuli, Italy, May 6th 1976 earthquake, two strong motion recorders accelerographs were installed in two sites about 650 meters distant one from the other. One instrument was installed on hard outcropping rock, the other at the surface of an alluvial deposit 20+25 meters thick underlain by a sloping bedrock. Among the numerous records obtained three aftershocks of magnitude about 6 and hypocentral distance within 20 Km, are investigated by comparing maximum accelerations, durations, Arias intensity and Husid ratios. A new numerical tool is proposed which consists of a series of plots of the Husid ratios of low-pass filtered accelerograms. The numerical tool seems to be very promising since it allows to describe at the same time energy, duration and frequencies content, of a given ground motion. Moreover the application to the records simultaneously obtained at the two stations suggests that it would be more appropriate to define an accelerogram according to the type of "behavior" shown by the site during a certain earthquake rather than according to the local site characteristics like soft or hard.
