Location
St. Louis, Missouri
Presentation Date
12 Mar 1991, 2:30 pm - 3:30 pm
Abstract
The method of microtremors has been recently applied for the microzonation of the town of alamata, in southern Greece. Results from this study are evaluated in comparison with predictions of seismic ground response obtained by 1-D wave propagation analyses. Predominant periods of microtremor are considerably lower than estimated fundamental ground periods. It is shown that a small part of the observed differences in due to soil non-linearity in connection with the small strain amplitudes induced by microtremors. The largest part appears to be due to geologic factors, namely the existence of rigid soil layers within the soft soil above the seismic bedrock of the area. These layers act as a ”pseudo" seismic bedrock and may consequently reduce the predominant period of microtremors relative to that of earthquake motions.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
2nd International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1991 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
Bouckovalas, George and Krikeli, Ioanna, "Effect of Local Soil Stratigraphy on Microtremor Measurements" (1991). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 10.
https://scholarsmine.mst.edu/icrageesd/02icrageesd/session08/10
Included in
Effect of Local Soil Stratigraphy on Microtremor Measurements
St. Louis, Missouri
The method of microtremors has been recently applied for the microzonation of the town of alamata, in southern Greece. Results from this study are evaluated in comparison with predictions of seismic ground response obtained by 1-D wave propagation analyses. Predominant periods of microtremor are considerably lower than estimated fundamental ground periods. It is shown that a small part of the observed differences in due to soil non-linearity in connection with the small strain amplitudes induced by microtremors. The largest part appears to be due to geologic factors, namely the existence of rigid soil layers within the soft soil above the seismic bedrock of the area. These layers act as a ”pseudo" seismic bedrock and may consequently reduce the predominant period of microtremors relative to that of earthquake motions.
