Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; April 1980; v. 70; no. 2; p. 631-637
© 1980 Seismological Society of America
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A technical note on PGA-intensity relations with applications to damage estimation

MARTIN W. MCCANN, Jr., FRANZ SAUTER and HARESH C. SHAH

THE JOHN A. BLUME EARTHQUAKE ENGINEERING CENTER DEPARTMENT OF CIVIL ENGINEERING STANFORD UNIVERSITY, STANFORD, CALIFORNIA 94305
FRANZ SAUTER Y ASOCIADOS LTDA, SAN JOSE, COSTA RICA

Abstract

The use of peak ground acceleration (PGA)-Modified Mercalli intensity (MMI) relations is discussed. A review of previous investigations in this area suggests that almost instinctively, a linear function, relating the log10(PGA) to MMI is assumed. This note proposes a quadratic form for such a relationship. The motivation for this study was provided by the application of PGA-MMI relations to the problem of damage estimations due to strong earthquake ground motion. A function relating PGA to MMI allows one to convert the probabilistic information on PGA, the typical parameter of seismic hazard analyses, to MMI, the parameter most commonly correlated to structural damage. The uncertainties in the variables used in the damage estimation are discussed.




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