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

Cervone, Guido; Maekawa, Shigeru; Singh, Ramesh P.; Hayakawa, Masashi; Kafatos, Menas; Швец, А. В.

doi:10.5194/nhess-6-109-2006

Cited by 66 publications

(34 citation statements)

References 24 publications

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“…Dey and Singh [49] found significant Surface Latent Heat Flux (SLHF) changes prior to the same earthquake. SLHF anomalies were also reported for the Colima earthquake, M = 7.8, 21 January 2003, Mexico [50] and the Tokachi-Oki earthquake, M = 8.3, 25 September 2003, Japan [51]. Reanalysis of climatic data are also involved in thermal data processing in seismic processes [52].…”

Section: Earth Surfacementioning

confidence: 94%

Satellite Remote Sensing in Seismology. A Review

Тронин

2009

Remote Sensing

108

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A wide range of satellite methods is applied now in seismology. The first applications of satellite data for earthquake exploration were initiated in the '70s, when active faults were mapped on satellite images. It was a pure and simple extrapolation of airphoto geological interpretation methods into space. The modern embodiment of this method is alignment analysis. Time series of alignments on the Earth's surface are investigated before and after the earthquake. A further application of satellite data in seismology is related with geophysical methods. Electromagnetic methods have about the same long history of application for seismology. Stable statistical estimations of ionosphere-lithosphere relation were obtained based on satellite ionozonds. The most successful current project "DEMETER" shows impressive results. Satellite thermal infra-red data were applied for earthquake research in the next step. Numerous results have confirmed previous observations of thermal anomalies on the Earth's surface prior to earthquakes. A modern trend is the application of the outgoing long-wave radiation for earthquake research. In '80s a new technology-satellite radar interferometry-opened a new page. Spectacular pictures of co-seismic deformations were presented. Current researches are moving in the direction of pre-earthquake deformation detection. GPS technology is also widely used in seismology both for ionosphere sounding and for ground movement detection. Satellite gravimetry has demonstrated its first very impressive results on the example of the catastrophic Indonesian earthquake in 2004. Relatively new applications of remote sensing for seismology as atmospheric sounding, gas observations, and cloud analysis are considered as possible candidates for applications.

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Section: Earth Surfacementioning

confidence: 94%

Satellite Remote Sensing in Seismology. A Review

Тронин

2009

Remote Sensing

108

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“…Our former case studies include the (1) Kobe EQ (17 January 1995) (Hayakawa et al 1996), (2) Tokachi-oki EQ (25 September 2003) (Shvets et al 2004;Cervone et al 2006), (3) Niigata-chuetsu EQ (23 October 2004) Yamauchi et al 2007), (4) the 1999 Chi-chi EQ in Taiwan (Hayakawa et al 2005) and, (5) the 2004 Sumatra EQ (Horie et al 2007a, b). The details of seismogenic effects for these EQs are summarized in our review by Hayakawa (2009c).…”

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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“…For this EQ, our previous analysis of subionospheric VLF/LF data (for example, from a Japanese JJY station (in Fukushima) to Moshiri, Hokkaido and to Kamchatka, Russia) has indicated that the ionosphere was disturbed about one week before the EQ (Shvets et al, 2004;Hayakawa et al, 2005). In good correspondence to this ionospheric perturbation, Cervone et al (2006) has found the anomaly in surface latent heat flux before the EQ. The period of these anomalous phenomena seems to be coincident with that obtained in the present paper.…”

Section: Summary and Discussionmentioning

confidence: 94%

Disturbances in VHF/UHF telemetry links as a possible effect of the 2003 Hokkaido Tokachi-oki earthquake

Nagamoto

Fukushima

Ida

et al. 2008

Nat. Hazards Earth Syst. Sci.

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Abstract. The data on radio telemetry links (for water information) at VHF/UHF in Hokkaido are used to investigate the rate of disturbances on radio links (or connection failure) and its association with a huge earthquake, Tokachi-oki earthquake on 26 September 2003. Especially, the telemetry links at the Tokachi region closest to the earthquake epicenter, showed a significant increase in disturbances on radio links two weeks to a few days before the earthquake on the basis of analysis during a long interval from 1 June 2002 to 3 November 2007 (over 5 years). We suggest that these severe disturbances in VHF/UHF telemetry links are attributed to the generation of seismogenic VHF/UHF radio noises (emissions). Based on this idea, we have estimated that the intensity of these seismogenic emissions is on the order of 10-19 dB µV/m. Finally, the present result was compared with other physical parameters already obtained for this earthquake.

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

Cited by 66 publications

References 24 publications

Satellite Remote Sensing in Seismology. A Review

Satellite Remote Sensing in Seismology. A Review

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

Disturbances in VHF/UHF telemetry links as a possible effect of the 2003 Hokkaido Tokachi-oki earthquake

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