Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

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

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

Share

 
COinS
 
Aug 11th, 12:00 AM Aug 16th, 12:00 AM

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.