Entropy measures are widely applied to quantify the complexity of dynamical systems in
diverse fields. However, the practical application of entropy methods is challenging, due to …

A lot of work in geosciences has been completed during the last decade on the analysis in
the new concept of time, termed natural time, introduced in 2001. The main advances are …

A wide variety of electromagnetic phenomena possibly related with earthquake (EQ)
preparation processes have been reported in the literature during the last few decades. An …

A quantity exists by which one can identify the approach of a dynamical system to the state
of criticality, which is hard to identify otherwise. This quantity is the variance of natural time χ …

Global column ozone and tropospheric temperature observations made by ground-based
(1964–2004) and satellite-borne (1978–2004) instrumentation are analyzed. Ozone and …

Nonextensive statistical mechanics, pioneered by Tsallis, has recently achieved a
generalization of the Gutenberg-Richter law for earthquakes. This remarkable generalization …

We have previously shown that the probability distribution of the order parameter κ 1 of
seismicity in natural time turns to be bimodal when approaching a mainshock. This reflects …

The target of this study is to detect the existence of criticality indices, namely, indices which
may be considered as in-time warning signals about the entrance of a mechanically loaded …

The behavior of seismicity in the area candidate to suffer a main shock is investigated after
the observation of the Seismic Electric Signal activity until the impending main shock. This is …

Self-similarity may originate from two origins: ie, the process memory and the process'
increments “infinite” variance. A distinction is attempted by employing the natural time χ …