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3-D Dynamic Analysis of Precariously Balanced Rocks Under Earthquake Excitation

Veeraraghavan, S. and Krishnan, S. (2012) 3-D Dynamic Analysis of Precariously Balanced Rocks Under Earthquake Excitation. In: 15th World Conference in Earthquake Engineering. International Association for Earthquake Engineering , pp. 1-10.

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Hundreds of Precariously Balanced Rocks (PBRs) exist in California. Since these rocks have been precariously placed for thousands of years, they can help in constraining the range of PGV (peak ground velocity) and frequency content of the ground motions that could not have occurred at this location during the time that the rock has been precariously positioned. We are developing 3-D models (with accurate rock-pedestal contact interface) of some of the PBRs that have been imaged using Terrestrial Laser Scanning (TLS) techniques. We use Rigid body dynamics to solve for the dynamic response of the rock models subjected to idealized and earthquake ground motions intensities to arrive at probabilistic constraints on region-wide ground shaking intensity by combining the results of this study with cosmogenic dating of these rocks. Such analyses could help quantify seismic hazards and validate ground motion simulations.

Item Type:Book Section
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URLURL TypeDescription
Veeraraghavan, S.0000-0002-8667-6022
Krishnan, S.0000-0002-2594-1523
Additional Information:We acknowledge the Southern California Earthquake Center (SCEC) and the United States Geological Survey (USGS) for funding this project. We thank Dr. Hudnut for providing us with the data for the Echo Cliff PBR.
Funding AgencyGrant Number
Southern California Earthquake Center (SCEC)UNSPECIFIED
Subject Keywords:Precariously Balanced Rocks, Rigid body dynamics, Housner’s block
Record Number:CaltechAUTHORS:20130306-085227002
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37333
Deposited By: Tony Diaz
Deposited On:28 Jun 2013 20:56
Last Modified:09 Mar 2020 13:19

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