Location

St. Louis, Missouri

Date

04 Jun 1993, 8:00 am - 10:00 am

Abstract

The 1985 Mexico City earthquake and the 1989 Loma Prieta earthquake provided well-documented evidence of the effect of local ground conditions on site response and damage patterns. Deep soft clay deposits, in particular, were often cited as the "culprit" of amplified ground motions. However, during the 1989 Loma Prieta earthquake, ground accelerations in the downtown Oakland area were amplified by a factor of two to four and a significant number of structures were heavily damaged, despite the fact that much of the area is underlain by deposits of deep stiff clay. A preliminary review of damage patterns in the Oakland area and preliminary site response analyses were performed to investigate the influence of deep stiff clay deposits on the observed ground motions.

Department(s)

Civil, Architectural and Environmental Engineering

Meeting Name

3rd Conference of the International Conference on Case Histories in Geotechnical Engineering

Publisher

University of Missouri--Rolla

Document Version

Final Version

Rights

© 1993 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Jun 1st, 12:00 AM

Damage Patterns/Response of Deep Stiff Clay in Oakland

St. Louis, Missouri

The 1985 Mexico City earthquake and the 1989 Loma Prieta earthquake provided well-documented evidence of the effect of local ground conditions on site response and damage patterns. Deep soft clay deposits, in particular, were often cited as the "culprit" of amplified ground motions. However, during the 1989 Loma Prieta earthquake, ground accelerations in the downtown Oakland area were amplified by a factor of two to four and a significant number of structures were heavily damaged, despite the fact that much of the area is underlain by deposits of deep stiff clay. A preliminary review of damage patterns in the Oakland area and preliminary site response analyses were performed to investigate the influence of deep stiff clay deposits on the observed ground motions.