Rescaled Range Analysis of Microtremors in the Yun-Chia Area, Taiwan

Hurst’s analysis of natural background microtremors at 10 stations in Yun-Li and Chia-Yi Counties, Taiwan, yields high values of H, ranging from 0.733 to 0.934. These values are found to be site-specific and stationary. Microtremors recorded in the foothills, on a hillside and at rock sites have hig...

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Veröffentlicht in:TAO : Terrestrial, atmospheric, and oceanic sciences atmospheric, and oceanic sciences, 2006-03, Vol.17 (1), p.129-138
Hauptverfasser: 張永孚(Young-Fo Chang), 陳建志(Chien-Chih Chen), 黃蕙珠(Huey-Chu Huang)
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Sprache:eng
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Zusammenfassung:Hurst’s analysis of natural background microtremors at 10 stations in Yun-Li and Chia-Yi Counties, Taiwan, yields high values of H, ranging from 0.733 to 0.934. These values are found to be site-specific and stationary. Microtremors recorded in the foothills, on a hillside and at rock sites have higher H values than those on the alluvial plain, near the coast or at soil sites although they may very well be affected by the local environment and geology. Since low-frequency microtremors tend to be more persistent in time, we suggest that the high values of the Hurst exponent H may be causally correlated with the presence of low frequencies. This seems likely because Hurst exponents H > 0.5 mean a higher statistical persistence of a random signal.
ISSN:1017-0839
2311-7680
DOI:10.3319/TAO.2006.17.1.129(T)