NDLI: Minimum of the order parameter fluctuations of seismicity before major earthquakes in Japan

Content Provider	PubMed Central
Author	Sarlis, Nicholas V. Skordas, Efthimios S. Varotsos, Panayiotis A. Nagao, Toshiyasu Kamogawa, Masashi Tanaka, Haruo Uyeda, Seiya
Abstract	It has been shown that some dynamic features hidden in the time series of complex systems can be uncovered if we analyze them in a time domain called natural time χ. The order parameter of seismicity introduced in this time domain is the variance of χ weighted for normalized energy of each earthquake. Here, we analyze the Japan seismic catalog in natural time from January 1, 1984 to March 11, 2011, the day of the M9 Tohoku earthquake, by considering a sliding natural time window of fixed length comprised of the number of events that would occur in a few months. We find that the fluctuations of the order parameter of seismicity exhibit distinct minima a few months before all of the shallow earthquakes of magnitude 7.6 or larger that occurred during this 27-y period in the Japanese area. Among the minima, the minimum before the M9 Tohoku earthquake was the deepest. It appears that there are two kinds of minima, namely precursory and nonprecursory, to large earthquakes.
Related Links	http://dx.doi.org/10.1073/pnas.1312740110
Ending Page	13738
Page Count	5
Starting Page	13734
File Format	PDF
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	34
Volume Number	110
Language	English
Publisher	National Academy of Sciences
Publisher Date	2013-08-20
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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