@article{3147129,
    title = "Natural-time analysis of critical phenomena: The case of seismicity",
    author = "Varotsos, P. A. and Sarlis, N. V. and Skordas, E. S. and Uyeda, S. and and Kamogawa, M.",
    journal = "Europhysics Letters (EPL)",
    year = "2010",
    volume = "92",
    number = "2",
    publisher = "IOP Publishing Ltd",
    doi = "10.1209/0295-5075/92/29002",
    abstract = "We first investigate in natural time the numerical simulations of a
simple deterministic self-organized critical system introduced to
describe avalanches in stick-slip phenomena. It is one-dimensional and
belongs to the same universality class as the train model for
earthquakes introduced by Burridge and Knopoff. We show that the
variance kappa(1) = <chi(2)> - <chi >(2) of natural time chi, becomes
approximately equal to 0.070 when the system approaches the critical
state. Next, we analyze in natural time the small earthquakes subsequent
to the low-frequency magnetic-field precursor observed near the
epicenter of the Ms7.1 Loma Prieta earthquake in 1989. We find that
almost five days before the mainshock, the condition kappa(1)
approximate to 0.070 was reached. Copyright (C) EPLA, 2010"
}