Seismo-ionospheric depression of the ULF geomagnetic fluctuations at Kamchatka and Japan

Schekotov, A.; Molchanov, O. A.; Hattori, Katsumi; Fedorov, E. N.; Gladyshev, V. A.; Belyaev, G.; Чебров, В. Н.; Sinitsin, V.; Gordeev, E.; Hayakawa, Masashi

doi:10.1016/j.pce.2006.02.043

Cited by 55 publications

(70 citation statements)

References 4 publications

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“…The observatories of ULF/ELF electromagnetic radiation are indicated in Figure 1 as NAK (Nakatsugawa, 35 Though the details of signal processing method have been summarized in [30], we repeat only the essential points on how to detect seismo-atmospheric ULF/ELF radiation and then how to determine the direction of arrival of the radiation.…”

Section: Elf Electromagnetic Radiationmentioning

confidence: 99%

Electromagnetic Precursors to the 2016 Kumamoto Earthquakes

Schekotov¹,

Izutsu²,

Asano³

et al. 2017

OJER

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The Kumamoto area of Kyusyu Island was attacked by a series of large earthquakes (EQs) in April, 2016. The first two foreshocks had the magnitudes of 6.5 and 6.4, and about 1 day later there was the main shock on 15 April (UT) with magnitude 7.3. These are fault-type EQs, and so we would expect a variety of electromagnetic precursors to these EQs because we had detected different phenomena for the 1995 Kobe EQ, same fault-type EQ. As for the lithospheric effect, the ULF data at Kanoya observatory (about 150 km from the EQ epicenters) are used, but the simple statistical analysis could not provide us with any clear evidence of ULF radiation from the lithosphere. However, our conventional analyses indicated clear signatures in the atmosphere as ULF/ELF impulsive emissions and also in the ionosphere as observed by means of VLF propagation anomalies and ULF depression. ULF/ELF radiation appeared on 8-11 April (in UT) (maximum on 10 and 11 April (UT)), while ULF depression took place on 8 and 10 April (in UT), so that both atmospheric radiation and ionospheric perturbation took place nearly during the same time period.

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Section: Elf Electromagnetic Radiationmentioning

confidence: 99%

Electromagnetic Precursors to the 2016 Kumamoto Earthquakes

Schekotov¹,

Izutsu²,

Asano³

et al. 2017

OJER

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“…Some ULF monitoring systems all over the world have registered anomalous ULF electromagnetic signals preceding moderate-large EQs (e.g., Kopytenko et al, 1990;Fraser-Smith et al, 1990;Hayakawa et al, 1996Hayakawa et al, , 2007Nagao et al, 2000;Uyeda et al, 2002;Hattori, 2004;Hattori et al, 2004aHattori et al, , b, 2013Schekotov et al, 2006;Hirano and Hattori, 2011;Chen et al, 2010;Han et al, 2011;Wen et al, 2012). Hattori (2004) found that the appearance of ULF electromagnetic anomalies prior to an EQ is related to its magnitude and the epicentral distance.…”

Section: F Febriani Et Al: Ultra Low Frequency (Ulf) Electromagnetimentioning

confidence: 99%

Ultra low frequency (ULF) electromagnetic anomalies associated with large earthquakes in Java Island, Indonesia by using wavelet transform and detrended fluctuation analysis

Febriani

Han

Yoshino

et al. 2014

Nat. Hazards Earth Syst. Sci.

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Abstract. Indonesia is one of the most seismically active regions in the world and mitigation of seismic hazard is important. It is reported that Ultra low frequency (ULF) geomagnetic anomalies are one of the most convincing phenomena preceding large earthquakes (EQs). In this paper we have analyzed geomagnetic data at Pelabuhan Ratu (PLR) (7.01 • S, 106.56 • E), Sukabumi, West Java, Indonesia, from 1 September 2008 to 31 October 2010. There are twelve moderate-large EQs (M ≥ 5) within 160 km from the station during the analyzed period. The largest one is the M = 7.5 EQ (depth = 57 km, epicentral distance = 135 km, 2 September 2009) based on EQ catalog of Indonesian Meteorological, Climatological and Geophysical Agency (BMKG). To investigate the ULF geomagnetic anomalous variations preceding all the EQs, spectral density ratio at the frequency range of 0.01 ± 0.003 Hz based on wavelet transform (WT) and detrended fluctuation analysis (DFA) have been carried out. The spectral density ratio results show the enhancements a few weeks before the largest EQ. The enhancement persists about one week and reaches a maximum on 16 August 2009. At the same time, the result of the DFA presents the decrease of α value. For other EQs, there are no clear increases of the spectral density ratio with simultaneous decrease of α value. When these phenomena occur, the value of Dst index shows that there are no peculiar global geomagnetic activities at the low latitude region. The above results are suggestive of the relation between the detected anomalies and the largest EQ.

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“…and we choose the LT close to local midnight. The optimum time is found to lie in the vicinity of LT = 3h for each site as based on our previous measurements (Schekotov et al, 2006).…”

Section: Data Analysis Proceduresmentioning

confidence: 62%

“…A different type of ULF anomaly of EQ effects has been found by Molchanov et al (2003) and Schekotov et al (2006). Being completely different from the above seismogenic lithospheric ULF emissions, this new effect is a phenomenon in the form of depression in the amplitude of ULF magnetic field fluctuations observed on the ground (probably, generated in the magnetosphere) a few days before an EQ.…”

Section: Introductionmentioning

confidence: 75%

“…Being completely different from the above seismogenic lithospheric ULF emissions, this new effect is a phenomenon in the form of depression in the amplitude of ULF magnetic field fluctuations observed on the ground (probably, generated in the magnetosphere) a few days before an EQ. Schekotov et al (2006) have performed an extensive study on this effect on the basis of observations in Russia (Karymshiro) during the four-year period of June 21, 2000 through June 6, 2004 and those in Japan (Matsukawa) during the two-year period from October 22, 2001to October 26, 2003. Their result was based on the analyses of 38 EQs (mainly oceanic EQs) with M in a range from 4.5 to 7.0 in Russia and of 22 separate EQs (mainly inland) with M from 5.5 to 8.3 in Japan.…”

Section: Introductionmentioning

confidence: 99%

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On the Ultra-Low-Frequency Magnetic Field Depression for Three Huge Oceanic Earthquakes in Japan and in the Kurile Islands

Hayakawa¹,

Schekotov²,

Fedorov³

et al. 2012

ESR

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The depression (reduction in amplitude) of ULF (ultra-low-frequency) magnetic field variations observed on the Earth's surface is found for the recent huge Japan earthquake (EQ) (magnitude (M) ~ 9.0) on March 11, 2011 which is a typical oceanic EQ of the plate type. In order to confirm the presence of such a ULF depression, we have also studied the additional two huge oceanic EQs in the Kurile islands (M@8), and similar ULF depressions have also been detected. This suggests that such a ULF depression seems to be a universal phenomenon for huge (M=8-9) EQs even occurred in the sea bed of subduction region.

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Seismo-ionospheric depression of the ULF geomagnetic fluctuations at Kamchatka and Japan

Cited by 55 publications

References 4 publications

Electromagnetic Precursors to the 2016 Kumamoto Earthquakes

Electromagnetic Precursors to the 2016 Kumamoto Earthquakes

Ultra low frequency (ULF) electromagnetic anomalies associated with large earthquakes in Java Island, Indonesia by using wavelet transform and detrended fluctuation analysis

On the Ultra-Low-Frequency Magnetic Field Depression for Three Huge Oceanic Earthquakes in Japan and in the Kurile Islands

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