Further investigations of geomagnetic diurnal variations associated with the 2011 off the Pacific coast of Tohoku earthquake (Mw 9.0)

Han, Pu; Hattori, Katsumi; Xu, Guangjing; Ashida, Ryo; Chen, Chieh-Hung; Febriani, Febty; Yamaguchi, Hideyo

doi:10.1016/j.jseaes.2015.02.022

Cited by 75 publications

(66 citation statements)

References 44 publications

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“…This, which is remarkably the deepest minimum ever observed during the period 1984-2011 investigated, almost coincides with the initiation of an SES activity-being in accordance with the findings by Varotsos et al (2013)since anomalous magnetic field variations appeared during the period 4-14 January 2011 on the z-component at two measuring sites (Esashi and Mizusawa) lying at epicentral distances of around 130 km (Xu et al 2013;Han et al 2015Han et al , 2016. Concerning the estimation of the epicentral location of the impending mainshock without making use of SES data, we follow the procedure developed by Sarlis et al (2015): By dividing the entire Japanese region N 46 25 E 148 125 (large area) into small areas, a calculation of the fluctuations of j 1 of seismicity is carried out on them.…”

Section: 1supporting

confidence: 88%

Identifying the occurrence time of an impending major earthquake: a review

2017

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Section: 1supporting

confidence: 88%

Identifying the occurrence time of an impending major earthquake: a review

2017

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“…see Refs. [63][64][65][66] for such phenomena observed before t he M = 9 Tohoku mega-earthquake on 11 March 2011) show that the main characteristics (e.g., amplitude, frequency range, lead time) of these precursory changes are similar to those discussed above for SES (which, as mentioned, for strong impending earthquakes are accompanied by detectable magnetic field variations). This observation has prompted the application [67] of the aforementioned criteria (Eq.…”

Section: Results For the Electric And Magnetic Signals That Precede Rsupporting

confidence: 65%

Entropy in Natural Time and the Associated Complexity Measures

Sarlis¹

2017

Preprint

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Natural time is a new time domain introduced in 2001. The analysis of time series associated with a complex system in natural time may provide useful information and may reveal properties that are usually hidden when studying the system in conventional time. In this new time domain, an entropy has been defined and complexity measures based on this entropy as well as its value under time-reversal have been introduced and found applications in various complex systems. Here, we review these applications in the electric signals that precede rupture, e.g., earthquakes, in the analysis of electrocardiograms, as well as in global atmospheric phenomena like the El Niño/La Niña Southern Oscillation.

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“…2 of Varotsos et al 2012c). The latter behavior is usually observed when a strong earthquake is included in the corresponding catalog excerpt shown to be valid also for another case, i.e., the M W 9 Tohoku EQ in the following sense: By combining the results obtained from the natural time analysis of the seismicity data Sarlis et al 2013Sarlis et al , 2015 and the anomalous geomagnetic field variations reported by Xu et al (2013) and Han et al (2015Han et al ( , 2016, we find that b W,min of seismicity is almost simultaneous with the latter anomalous variations that are characteristic of a strong SES activity; in addition, these two phenomena are also linked in space since a spatiotemporal study of b W,min of seismicity by Sarlis et al (2015) led to a region that lies within a few hundred kilometers from the M W 9 Tohoku EQ epicenter.…”

Section: Discussionmentioning

confidence: 64%

“…4) in which unique anomalous geomagnetic field variations appeared on the z component, at two stations lying at epicentral distances of around 130 km (Xu et al 2013;Han et al 2015Han et al , 2016, which are characteristic of an accompanying strong SES activity (Varotsos et al 2001a;Sarlis and Varotsos 2002;Varotsos et al 2003c).…”

Section: Discussionmentioning

confidence: 99%

M W9 Tohoku earthquake in 2011 in Japan: precursors uncovered by natural time analysis

et al. 2017

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This paper reviews the precursory phenomena of the 2011 M W 9 Tohoku earthquake in Japan that emerge solely when we analyze the seismicity data in a new time domain termed natural time. If we do not consider this analysis, important precursory changes cannot be identified and hence are missed. Natural time analysis has the privilege that enables the introduction of an order parameter of seismicity. In this frame, we find that the fluctuations of this parameter exhibit an unprecedented characteristic change, i.e., an evident minimum, approximately two months before Tohoku earthquake, which strikingly is almost simultaneous with unique anomalous geomagnetic field variations recorded mainly on the z component. This is consistent with our finding that such a characteristic change in seismicity appears when a seismic electric signal (SES) activity of the VAN method (from the initials of Varotsos, Alexopoulos, Nomicos) initiates, and provides a direct confirmation of the physical interconnection between SES and seismicity.

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Further investigations of geomagnetic diurnal variations associated with the 2011 off the Pacific coast of Tohoku earthquake (Mw 9.0)

Cited by 75 publications

References 44 publications

Identifying the occurrence time of an impending major earthquake: a review

Identifying the occurrence time of an impending major earthquake: a review

Entropy in Natural Time and the Associated Complexity Measures

M W9 Tohoku earthquake in 2011 in Japan: precursors uncovered by natural time analysis

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