Study of seismic influence on the ionosphere by super long-wave probing of the Earth-ionosphere waveguide

Гохберг, М. Б.; Gufeld, I. L.; Rozhnoy, A A; Marenko, V.F.; Yampolsky, V.S.; Ponomarev, E. A.

doi:10.1016/0031-9201(89)90214-8

Cited by 123 publications

(57 citation statements)

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“…Among different kinds of electromagnetic precursors mentioned above, the ionospheric perturbations which belong to the second category seem to be the most reliable because a substantial number of VLF/LF work have been accumulated including both cases and statistical studies [as summarized in Hayakawa (2009c)] since the initial work by Gokhberg et al (1989) and Gufeld et al (1992). Recently the lower ionospheric perturbation as detected by subionospheric VLF/LF propagation is shown to be statistically significantly correlated with EQs which take place within the wave sensitive area of the great-circle path and with magnitude tentatively greater than 6.0 and shallower depth (< 40 km) (Hayakawa et al 2010a, b).…”

Section: Introductionmentioning

confidence: 99%

The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network

Hayakawa¹,

Hobara²,

Рожной³

et al. 2013

Terr. Atmos. Ocean. Sci.

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By using network observation of subionospheric VLF (very low frequency)/LF (low frequency) signals in Japan and in Russia, we have found a significant ionospheric perturbation prior to the recent 2011 March 11 Japan earthquake (EQ) which occurred at sea proximate to the Tohoku area on the main island (Honshu) of Japan was an exceptionally huge plate-type EQ. A remarkable anomaly (with a decrease in the nighttime amplitude and also with enhancement in dispersion) was detected on March 5 and 6 along the propagation path from the NLK (Seattle, USA) transmitter to Chofu (together with Kochi and Kasugai). We also have observed the corresponding VLF anomaly during a prolonged period of March 1 -6, with minima in the nighttime amplitude on March 3 and 4 along the path from JJI (Miyazaki, Kyushu) to Kamchatka, Russia. This ionospheric perturbation has been discussed extensively with respect to its reliability. (1) How abnormal is this VLF/LF propagation anomaly? (2) What was the temporal evolution of terminator times? (3) Were there any solar-terrestrial effects (especially the effect from geomagnetic storms) on the VLF/LF propagation anomaly? (4) The effect of any other EQs and foreshock activities on the VLF/LF anomaly? (5) Were there any correlations with other related phenomena? Finally, (6) are there any other examples of a VLF/LF propagation anomaly for oceanic EQs? We then compared the temporal properties of ionospheric perturbations for this EQ with those of a huge number of inland EQs and compared the corresponding spatial scale with the former result of the same oceanic 2004 Sumatra EQ with nearly the same magnitude. Finally, the generation mechanism of those seismo-ionospheric perturbations is briefly discussed.

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Section: Introductionmentioning

confidence: 99%

The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network

Hayakawa¹,

Hobara²,

Рожной³

et al. 2013

Terr. Atmos. Ocean. Sci.

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“…Some promising results have been found to demonstrate anomalous deviations in the VLF phase or/and amplitude (Gokhberg et al, 1989;Hayakawa et al, 1996Hayakawa et al, , 2004Hayakawa, 1999).…”

Section: Introductionmentioning

confidence: 99%

Surface latent heat flux and nighttime LF anomalies prior to the M<sub>w</sub>=8.3 Tokachi-Oki earthquake

Cervone

Maekawa

Singh

et al. 2006

Nat. Hazards Earth Syst. Sci.

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Abstract. Surface Latent Heat Flux (SLHF) is an atmospheric parameter proportional to the evaporation from the Earth's surface. SLHF has been found to exhibit an anomalous behavior in the epicentral region prior to several coastal earthquakes. Sub-ionospheric low frequency (LF) radio sounding measurements have shown its potentiality for the short-term earthquake forecasting since the last decade. The anomalous SLHF and nighttime LF sub-ionospheric signals are found to show complementary nature associated with the large Tokachi-Oki earthquake of 25 September 2003. Such complementary nature of parameters may prove to be potential in providing early warning information about an impending earthquake.

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“…Such studies were also published earlier [e.g., Gokhberg et al, 1989]. However, a U.S. Geological Survey statistical examination of the phenomena concluded that the precursory relationship reported is not statistically signifi cant [Michael, 1996].…”

Section: Eos Volume 88 Number 23 5 June2007mentioning

confidence: 61%

“…Pioneering works by Gokhberg et al [1989] and Molchanov and Hayakawa [1998] were also mentioned even if they were lacking in elaborate statistical analysis. In their comment, Rodger and Clilverd stress that the existence of preseismic subionospheric anomalies is controversial, citing some papers such as those by Michael [1996] and Clilverd et al [1999].…”

Section: Lettersmentioning

confidence: 99%

Eos, Transactions, American Geophysical Union Volume 88, Number 23, 5 June 2007

2007

EoS Transactions

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Study of seismic influence on the ionosphere by super long-wave probing of the Earth-ionosphere waveguide

Cited by 123 publications

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The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network

The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network

Surface latent heat flux and nighttime LF anomalies prior to the M<sub>w</sub>=8.3 Tokachi-Oki earthquake

Eos, Transactions, American Geophysical Union Volume 88, Number 23, 5 June 2007

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Study of seismic influence on the ionosphere by super long-wave probing of the Earth-ionosphere waveguide

Cited by 123 publications

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The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network

The Ionospheric Precursor to the 2011 March 11 Earthquake Based upon Observations Obtained from the Japan-Pacific Subionospheric VLF/LF Network

Surface latent heat flux and nighttime LF anomalies prior to the M&lt;sub&gt;w&lt;/sub&gt;=8.3 Tokachi-Oki earthquake

Eos, Transactions, American Geophysical Union Volume 88, Number 23, 5 June 2007

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Surface latent heat flux and nighttime LF anomalies prior to the M<sub>w</sub>=8.3 Tokachi-Oki earthquake