Wald, David J. and Quitoriano, Vincent and Heaton, Thomas H. and Kanamori, Hiroo (1999) Relationships between Peak Ground Acceleration, Peak Ground Velocity, and Modified Mercalli Intensity in California. Earthquake Spectra, 15 (3). pp. 557-564. ISSN 8755-2930 http://resolver.caltech.edu/CaltechAUTHORS:20120111-121312741
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We have developed regression relationships between Modified Mercalli Intensity (I_mm) and peak ground acceleration (PGA) and velocity (PGV) by comparing horizontal peak ground motions to observed intensities for eight significant California earthquakes. For the limited range of Modified Mercalli intensities (I_mm), we find that for peak acceleration with V ≤ I_mm ≤ VIII, I_mm = 3.66 log(PGA) − 1.66, and for peak velocity with V ≤ I_mm ≤ IX, I_mm = 3.47 log(PGV) + 2.35. From comparison with observed intensity maps, we find that a combined regression based on peak velocity for intensity > VII and on peak acceleration for intensity < VII is most suitable for reproducing observed I_mm patterns, consistent with high intensities being related to damage (proportional to ground velocity) and with lower intensities determined by felt accounts (most sensitive to higher‐frequency ground acceleration). These new I_mm relationships are significantly different from the Trifunac and Brady (1975) correlations, which have been used extensively in loss estimation.
|Additional Information:||© 1999 Earthquake Spectra. Conversations with J. Boatwright, L. Dengler, J. Dewey, K. Campbell, R. Nigbor, and M. Petersen were very helpful. Jim Dewey provided the intensity data in digital form. Reviews by K. Campbell, M. Trifunac, R. Graves, and N. Field greatly improved this manuscript, as did recommendations of Editorial Board Member P. Somerville.|
|Subject Keywords:||Earthquake intensities, maximum ground acceleration, maximum ground velocity, Northridge, California earthquake, Jan. 17, 1994, Landers, California earthquake, June 28, 1992, Sierra Madre, California earthquake, June 28, 1991, Loma Prieta, California earthquake, Oct. 17, 1989, Whittier Narrows, California earthquake, Oct. 1, 1987, North Palm Springs, California earthquake, July 8, 1986, Imperial Valley, California earthquake, Oct. 15, 1979, San Fernando, California earthquake, Feb. 9, 1971, Modified Mercalli intensities|
|Official Citation:||Relationships between Peak Ground Acceleration, Peak Ground Velocity, and Modified Mercalli Intensity in California David J. Wald, Vincent Quitoriano, Thomas H. Heaton, and Hiroo Kanamori, Earthquake Spectra 15, 557 (1999), DOI:10.1193/1.1586058|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||12 Jan 2012 20:59|
|Last Modified:||12 Jan 2012 20:59|
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