Anomalies Observed in VLF and LF Radio Signals on the Occasion of the Western Turkey Earthquake (M&amp;lt;sub&amp;gt;w&amp;lt;/sub&amp;gt; = 5.7) on May 19, 2011

Biagi, P. F.; Righetti, Fabio; Maggipinto, T.; Schiavulli, L.; Ligonzo, T.; Ermini, A.; Moldovan, Iren-Adelina; Moldovan, A. S.; Silva, Hugo; Bezzeghoud, Mourad; Contadakis, M. E.; Arabelos, D.; Xenos, Thomas D.; Büyüksaraç, Aydın

doi:10.4236/ijg.2012.324086

Cited by 13 publications

(11 citation statements)

References 37 publications

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“…In this paper, the anomaly investigated refers to the value of the crustal heights measured by means of GPS techniques. In accordance with other types of anomalies, such as radio [3, 5,13,14] or chemical anomalies, the presesimic effects are mainly located around the epicentral area. We can conclude that GPS techniques can be of ex-treme importance in the task of earthquake prediction, and together with other type of anomalies related to seismic activity, we can have the basis for a multi-parametric approach in earthquake prediction.…”

Section: Discussionsupporting

confidence: 60%

Variation of Altitude Observed on the Occasion of the Tohoku Earthquake (M = 9.0) Occurred on March 11, 2011

Milillo¹,

Maggipinto²,

Biagi³

2014

OJER

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Since October 1, 2010, a GPS receiver is put into operation at Tokai (Japan) in an experiment on Neutrino Physics (T2K). A significant variation of the altitude was detected from the beginning of March 2011, so that it has made worthwhile to investigate the possibility that such variations could be correlated to the Tohoku earthquake. In order to investigate in details this possibility, we analyzed the GPS data collected during 2011 by GEONet the GPS Earth Observation Network (GEONET). GEONET is the GPS network of Japan and consists of 1240 permanent stations. Preliminary results of the analysis seemed to show ten days before the earthquake, some possible anomalous behaviors of the stations. These anomalous behaviors were particularly relevant for stations of the network near the epicentral area. While co-seismic and post-seismic variations are widely expected, the anomalies recorded about ten days before the earthquake could be seriously considered among short-term precursors of the earthquake. In order to confirm this possibility, more detailed studies have been performed. In particular, GEONET currently makes available only daily solutions of the stations coordinates. On the contrary, it is very important to improve the time resolution just to understand the features of the anomalies till the last hours before the Earthquake. For this reason, we have performed an analysis to evaluate the coordinates and movement on hourly basis so improving the time resolution.

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Section: Discussionsupporting

confidence: 60%

Variation of Altitude Observed on the Occasion of the Tohoku Earthquake (M = 9.0) Occurred on March 11, 2011

Milillo¹,

Maggipinto²,

Biagi³

2014

OJER

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“…Events that are not in close proximity to the receiver, can at most produce disturbances in stations that are in the same bearing as the seismic event in question, as it has been shown in previous studies [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], concerning a variety of methods and disturbances. In the case of this particular seismic event, which took place near the receiver, a disturbance is evident across the signals of all the stations and especially the VLF stations and provides a clear pattern to pinpoint and detect the precursor phenomena of a seismic event in the area close to the receiving antenna.…”

Section: Resultsmentioning

confidence: 61%

“…Agreat amount of research in the last twenty years by means of ground-based experiments [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], spaceborn studies [18], [19], [20] and combined space-born and ground-based studies [21], [22] as well, indicate the existence of pre-, co-and post-earthquake ionospheric perturbations at all ionospheric layer levels (D, E and F layers).…”

Section: Introductionmentioning

confidence: 99%

ZAM distribution analysis of radiowave ionospheric propagation interference measurements

Skeberis

Zaharis

Xenos

et al. 2014

2014 International Conference on Telecommunications and Multimedia (TEMU)

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This work investigates the occurrence of radiowave propagation disturbances across a wide range of VLF and LF frequencies received prior to a seismic event (Mw=4), that took place on May 12th 2012, the epicenter of which was very close (14Km) to the receiver. The signals analysed were from 4 VLF and 6 LF European transmitters. This seismic event produced precursory ionospheric disturbances, identified as spectral distortion, before its occurrence, providing a distinct pattern. Although the basis of the ionosphere interaction with seismic phenomena has been well documented in previous studies, the close proximity of the receiver to the seismic event provides a new perspective to this study. The received signals have undergone normalisation and then they have been processed by the application of the Zhao-Atlas-Marks Distribution (ZAMD). Diagrams of the signals relevant to the phenomena are presented as well as the the result of the application of the ZAMD.

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“…Evident anomalies were revealed both in the signals broadcasted by the TRT transmitter (180 kHz) located near Ankara and in a VLF signal coming from a transmitter located in western Europe and collected by the receiver TUR of the network located in eastern Turkey. Evident precursor phases were pointed out (Biagi et al 2012). ELF (Extremely Low Frequency)-VLF emissions occurred during fracturing of rocks, in laboratory experiments, and have been recorded also before earthquakes by three ELF-VLF stations installed in Central Apennines.…”

Section: Introductionmentioning

confidence: 95%

Periodical Measurements of VLF Radio Signals and Noise Sounds in Črna Jama (Postojnska Jama)

Kachalin

Liashchuk

Šebela

2017

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frekvenčnih) radijskih signalov za določitev možnih predseizmičnih in/ali drugih nepravilnosti. želeli smo določiti primernost meritev VLF v naravnem okolju kraške jame. Sprememba VLF signala je bila povezana z močno vremensko fronto in spremembami nivoja padavin. VLF podatki so pokazali dnevne in nočne spremembe ter izrazite spremembe med suhimi in deževnimi obdobji, ko je voda s površja skozi okrog 30 m debel jamski strop prišla do jamske dvorane. Med merjenjem VLF nismo dobili pred-potresnega signala. VLF monitoring v kraški jami je lahko možnost za prihodnje raziskave razumevanja pred potresnih in drugih nepravilnosti. Povezava v realnem času z drugimi VLF površinskimi ali jamskimi merilnimi mesti v Evropi je potrebna za prihodnje VLF meritve. Rezultati predhodnih meritev VLF so pokazali, da je Črna jama primerno mesto za raziskave v prihodnosti. Ključne besede: VLF radijski signali, šumi, pred-potresne nepravilnosti, Črna jama, Slovenija.

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Anomalies Observed in VLF and LF Radio Signals on the Occasion of the Western Turkey Earthquake (M<sub>w</sub> = 5.7) on May 19, 2011

Cited by 13 publications

References 37 publications

Variation of Altitude Observed on the Occasion of the Tohoku Earthquake (M = 9.0) Occurred on March 11, 2011

Variation of Altitude Observed on the Occasion of the Tohoku Earthquake (M = 9.0) Occurred on March 11, 2011

ZAM distribution analysis of radiowave ionospheric propagation interference measurements

Periodical Measurements of VLF Radio Signals and Noise Sounds in Črna Jama (Postojnska Jama)

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