Arid
DOI10.1785/0120010221
Assessment of the site conditions of precariously balanced rocks in the Mojave Desert, southern California
Stirling, MW; Anooshehpoor, A; Brune, JN; Biasi, GP; Wesnousky, SG
Corresponding AuthorStirling, MW
JournalBULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
ISSN0037-1106
Year Published2002
Volume92Issue:6Pages:2139-2144
Abstract in English

We examine whether groups of precariously balanced rocks in the Mojave Desert, southern California, may have remained standing for thousands of years because anomalous site conditions prevent the rocks from toppling during large earthquakes. Measurements of peak ground velocity at bandwidths of 0.5-1, 1-2, 2-4, 4-8, and 8-16 Hz for 56 earthquakes (M-L 3.5-4.8) at two sites of precarious rocks are compared with velocities recorded for the same earthquakes by three TRI-NET* stations located on engineering "rock" (National Earthquake Hazard Reduction Program [NEHRP] site class B). We find that the residuals (the logarithm of the ratio of the, amplitudes recorded at the precarious-rock sites to the TRINET amplitudes for the same earthquake and epicentral distance) at frequencies less than about 4 Hz are negative (i.e., deamplification of 50%-250%), whereas the residuals are slightly positive at the higher frequencies (i.e., amplification of up to 25%-50%). High-frequency ground motions (e.g., peak ground acceleration) may therefore be slightly amplified at the precarious-rock sites, which means that site conditions do not appear to explain the existence of the precarious rocks in areas where high peak ground accelerations are predicted in recent probabilistic seismic-hazard (PSH) models. This discrepancy between the precarious rocks and the PSH models should be urgently resolved.


SubtypeArticle
Language英语
CountryNew Zealand ; USA
Indexed BySCI-E
WOS IDWOS:000179024900006
WOS SubjectGeochemistry & Geophysics
WOS Research AreaGeochemistry & Geophysics
Document Type期刊论文
Identifierhttp://119.78.100.177/qdio/handle/2XILL650/142261
Affiliation(1)Inst Geol & Nucl Sci, Lower Hutt, New Zealand;(2)Univ Nevada, Nevada Seismol Lab, Reno, NV 89557 USA;(3)Univ Nevada, Ctr Neotecton Studies, Reno, NV 89557 USA
Recommended Citation
GB/T 7714
Stirling, MW,Anooshehpoor, A,Brune, JN,et al. Assessment of the site conditions of precariously balanced rocks in the Mojave Desert, southern California[J],2002,92(6):2139-2144.
APA Stirling, MW,Anooshehpoor, A,Brune, JN,Biasi, GP,&Wesnousky, SG.(2002).Assessment of the site conditions of precariously balanced rocks in the Mojave Desert, southern California.BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,92(6),2139-2144.
MLA Stirling, MW,et al."Assessment of the site conditions of precariously balanced rocks in the Mojave Desert, southern California".BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA 92.6(2002):2139-2144.
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