Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; February 2005; v. 95; no. 1; p. 354-360; DOI: 10.1785/0120040092
© 2005 Seismological Society of America
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Comment

Comment on "Systematic Analysis of Shear-Wave Splitting in the Aftershock Zone of the 1999 Chi-Chi, Taiwan, Earthquake: Shallow Crustal Anisotropy and Lack of Precursory Changes, by Yungfeng Liu, Ta-Liang Teng, and Yehuda Ben-Zion"

Stuart Crampin1,2 and Yuan Gao1,3

1 Shear-Wave Analysis Group, School of GeoSciences
University of Edinburgh, Grant Institute, West Mains Road
Edinburgh EH9 3JW
Scotland, United Kingdom
scrampin{at}ed.ac.uk
ygao{at}staffmail.ed.ac.uk
 (S.C, Y.G.)

2 Edinburgh Anisotropy Project, British Geological Survey
Murchison House
West Mains Road
Edinburgh EH9 3LA
Scotland, United Kingdom
 (S.C.)

3 Institute of Earthquake Science
China Earthquake Administration
63 Fuxing Road
100036 Beijing, China
gaoyuan{at}seis.ac.cn
 (Y.G.)

Liu et al. (2004) systematically analyze the parameters of shear-wave splitting before and after the 1999 Chi-Chi earthquake in Taiwan. They claim that they see no evidence for the temporal changes in shear-wave time delays, which some of us use to monitor the buildup of stress before earthquakes. In fact, the only diagram where one would expect to see the type of temporal changes observed elsewhere, figure 14a in Liu et al. (2004), does show two types of temporal variations of time delays. Here, we fit least-squares lines to these temporal changes and show that the duration/earthquake-magnitude relationships of these various changes agree very well with those seen elsewhere. Thus, the behavior before the Chi-Chi earthquake lends further support to the use of shear-wave splitting to stress-forecast the times and magnitudes of impending earthquakes.




This article has been cited by other articles:


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S. Crampin, Y. Gao, and S. Peacock
Stress-forecasting (not predicting) earthquakes: A paradigm shift?
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[Abstract] [Full Text] [PDF]

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 Bulletin of the Seismological Society of AmericaHome page
Y. Liu, Y. Ben-Zion, and T.-L. Teng
Reply to "Comment on 'Systematic Analysis of Shear-Wave Splitting in the Aftershock Zone of the 1999 Chi-Chi, Taiwan, Earthquake: Shallow Crustal Anisotropy and Lack of Precursory Changes,' by Yunfeng Liu, Ta-Liang Teng, and Yehuda Ben-Zion," by Stuart Crampin and Yuan Gao
Bulletin of the Seismological Society of America, February 1, 2005; 95(1): 361 - 366.
[Full Text] [PDF]


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