破裂前磁场和电场变化的去趋势波动分析
Detrended fluctuation analysis of the magnetic and electric field variations that precede rupture
摘要：
磁场变化在破裂之前以交替符号的“尖峰”形式被检测到。这些“尖峰”与随机噪声的区别具有重大的实际意义，因为进行磁场测量比电场测量更容易。应用去趋势波动分析，这些“尖峰”看起来是随机的，滞后时间很短。另一方面，长范围相关性在大于连续“尖峰”之间的平均时间间隔的时滞处占优势，其标度指数$α$在0.9左右。此外，DFA被应用到最近的preseeding电场变化的持续时间长（几个小时到几天），并揭示了一个规模不变的功能与指数$α\approx 1$在所有可用的规模（约五个数量级）。
英文摘要：
Magnetic field variations are detected before rupture in the form of `spikes' of alternating sign. The distinction of these `spikes' from random noise is of major practical importance, since it is easier to conduct magnetic field measurements than electric field ones. Applying detrended fluctuation analysis (DFA), these `spikes' look to be random at short time-lags. On the other hand, long range correlations prevail at time-lags larger than the average time interval between consecutive `spikes' with a scaling exponent $α$ around 0.9. In addition, DFA is applied to recent preseismic electric field variations of long duration (several hours to a couple of days) and reveals a scale invariant feature with an exponent $α\approx 1$ over all scales available (around five orders of magnitude).
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