反常氦序列中的标度和交叉现象
Scaling and crossover phenomena in anomalous helium sequence
摘要：
在一些重大地震事件之前，已经在许多场合观察到春季射气中氦浓度的异常时间波动。最近的几项研究表明，各种各样的自然系统显示出显着的波动，其特征可能是长程幂律相关性。本文应用去趋势波动分析（DFA）来描述前氦异常，并探讨两类明显不规则的氦序列之间的关系。DFA技术的应用揭示了一个交叉现象，区分短程从长程标度指数的交叉对应的过渡，从非持久性到持久性性状的氦时间序列。我们的研究结果意味着一个显着的异常氦浓度和波动指数之间的统计相关性。这种分析方法似乎是一种很有前途的方式来识别异常氦波动信号的地震。
英文摘要：
Anomalous temporal fluctuations of helium concentrations in spring emanations have been observed on a number of occasions prior to some major seismic events. Several recent studies have shown that a wide variety of natural systems display significant fluctuations that may be characterized by long-range power-law correlations. We have applied detrended fluctuation analysis (DFA) to characterize preseismic helium anomalies and to probe the relationship between two classes of apparently irregular helium sequences. Application of the DFA technique reveals a crossover phenomenon that distinguishes short-range from long-range scaling exponents; the crossover corresponds to a transition from nonpersistent to persistent traits in the helium time series. Our findings imply a significant statistical correlation between anomalous helium concentration and a fluctuation exponent. This analytical approach appears to be a promising way for identifying anomalous helium fluctuations as signals precursory to an earthquake.
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