Universal law for waiting internal time in seismicity and its implication to earthquake network
Department of Physical Engineering, Mie University - Mie 514-8507, Japan
2 College of Science and Technology, Nihon University - Chiba 274-8501, Japan
Accepted: 6 January 2012
In their paper (Europhys. Lett., 71 (2005) 1036), Carbone, Sorriso-Valvo, Harabaglia and Guerra showed that the “unified scaling law” for conventional waiting times of earthquakes claimed by Bak et al. (Phys. Rev. Lett., 88 (2002) 178501) is actually not universal. Here, instead of the conventional time, the concept of the internal time termed the event time is considered for seismicity. It is shown that, in contrast to the conventional waiting time, the waiting event time obeys a power law. This implies the existence of temporal long-range correlations in terms of the event time with no sharp decay of the crossover type. The discovered power-law waiting event-time distribution turns out to be universal in the sense that it takes the same form for seismicities in California, Japan and Iran. In particular, the parameters contained in the distribution take the common values in all these geographical regions. An implication of this result to the procedure of constructing earthquake networks is discussed.
PACS: 91.30.Dk – Seismicity / 05.65.+b – Self-organized systems / 89.75.Da – Systems obeying scaling laws
© EPLA, 2012