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Reply to Comment by J. Zhang and N. Makris on “Estimates of the Ground Accelerations at Point Reyes Station during the 1906 San Francisco Earthquake” by A. Anooshehpoor, T. H. Heaton, B. Shi, and J. N. Brune

Anooshehpoor, A. and Heaton, T. H. and Shi, B. and Brune, J. N. (2000) Reply to Comment by J. Zhang and N. Makris on “Estimates of the Ground Accelerations at Point Reyes Station during the 1906 San Francisco Earthquake” by A. Anooshehpoor, T. H. Heaton, B. Shi, and J. N. Brune. Bulletin of the Seismological Society of America, 90 (5). pp. 1349-1351. ISSN 0037-1106. http://resolver.caltech.edu/CaltechAUTHORS:20121204-143300103

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Abstract

Contrary to the comments by Zhang and Makris (hereafter, ZM), our equations of motion governing the rocking response of a rectangular block subjected to a full-sine acceleration pulse are correct. Therefore, the first part of ZM's discussion, which is based primarily upon the assumption that the equations of motion in our article were incorrect, is inappropriate. In the second part of the discussion, ZM present new results for mode 2, toppling without impact. We did not consider this mode because it was not relevant to the Point Reyes train, which by eyewitness accounts, had overturned after experiencing one impact. However, as explained in this reply, toppling with no impact is never the minimum condition for overturning, and would in general involve very large horizontal accelerations, especially at frequencies where mode 2 is the only overturning mode.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1785/0119990157 DOIArticle
http://bssa.geoscienceworld.org/content/90/5/1349PublisherArticle
ORCID:
AuthorORCID
Heaton, T. H.0000-0003-3363-2197
Additional Information:© 2000 by the Seismological Society of America. Manuscript received 13 December 1999.
Record Number:CaltechAUTHORS:20121204-143300103
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20121204-143300103
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35797
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:05 Dec 2012 22:55
Last Modified:13 Dec 2016 21:35

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