Location
Arlington, Virginia
Date
16 Aug 2008, 8:45am - 12:30pm
Abstract
Among other factors that influence the seismic motion resulting at the ground surface are the characteristics of the seismic source. This factor has been recognized that would affect the frequency content of the resulting motion. In this context, Chilean subductive environment provides a considerable variety of seismogenic sources allowing the study of this factor. The analysis of spectrograms of recorded earthquakes originated by different seismogenic sources at different site conditions is presented. The results indicate that in the case of shallow thrust earthquakes a predominant frequency can be observed, which agrees with the predominant frequency obtained by the H/V spectral ratio (Nakamura´s procedure), validating the applicability of the H/V spectral ratio to estimate the predominant frequency of a site and at the same time showing that the soil deposits are excited in modes associated with vertical shear wave propagation. On the other hand, the spectrograms of intraplate earthquakes show predominant frequencies covering a wide range, which are different and higher than the predominant frequency obtained by H/V spectral ratio. Similar results were obtained for cortical earthquakes.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
6th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2008 Missouri University of Science and Technology, 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
Verdugo, Ramón and Pastén, César, "Seismic Source and Its Effect on Site Response Observed in Chilean Subductive Environment" (2008). International Conference on Case Histories in Geotechnical Engineering. 28.
https://scholarsmine.mst.edu/icchge/6icchge/session03/28
Seismic Source and Its Effect on Site Response Observed in Chilean Subductive Environment
Arlington, Virginia
Among other factors that influence the seismic motion resulting at the ground surface are the characteristics of the seismic source. This factor has been recognized that would affect the frequency content of the resulting motion. In this context, Chilean subductive environment provides a considerable variety of seismogenic sources allowing the study of this factor. The analysis of spectrograms of recorded earthquakes originated by different seismogenic sources at different site conditions is presented. The results indicate that in the case of shallow thrust earthquakes a predominant frequency can be observed, which agrees with the predominant frequency obtained by the H/V spectral ratio (Nakamura´s procedure), validating the applicability of the H/V spectral ratio to estimate the predominant frequency of a site and at the same time showing that the soil deposits are excited in modes associated with vertical shear wave propagation. On the other hand, the spectrograms of intraplate earthquakes show predominant frequencies covering a wide range, which are different and higher than the predominant frequency obtained by H/V spectral ratio. Similar results were obtained for cortical earthquakes.
