Study of electromagnetic emissions associated with seismic activity in Kamchatka region

Gladychev, V.; Baransky, L.; Schekotov, A.; Fedorov, E. N.; Pokhotelov, O. A.; Andreevsky, S.; Рожной, А.; Khabazin, Yu. G.; Belyaev, G.; Горбатиков, А. В.; Gordeev, E.; Чебров, В. Н.; Sinitsin, V.; Lutikov, A. I.; Yunga, S.; Kosarev, G. L.; Сурков, В. В.; Molchanov, O. A.; Hayakawa, Masashi; Uyeda, Seiya; Nagao, Tadami; Hattori, Katsumi; Noda, Yoichi

doi:10.5194/nhess-1-127-2001

Cited by 9 publications

(4 citation statements)

References 16 publications

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“…This observatory began operation in 2011, being the first observatory of its kind in Spain. different components of the magnetic field [57], and the development of theoretical models for describing the intensity of the SR by disturbances in the ionosphere over the top of the epicenter of an earthquake. One of these theoretical models is based on ionosphere's vertical conductivity profile model, describing the regular Earth-ionosphere cavity.…”

Section: Elf Sensormentioning

confidence: 99%

Applied Engineering Using Schumann Resonance for Earthquakes Monitoring

et al. 2017

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For populations that may be affected, the risks of earthquakes and tsunamis are a major concern worldwide. Therefore, early detection of an event of this type in good time is of the highest priority. The observatories that are capable of detecting Extremely Low Frequency (ELF) waves (<300 Hz) today represent a breakthrough in the early detection and study of such phenomena. In this work, all earthquakes with tsunami associated in history and all existing ELF wave observatories currently located worldwide are represented. It was also noticed how the southern hemisphere lacks coverage in this matter. In this work, the most suitable locations are proposed to cover these geographical areas. Also, ELF data processed obtained from the observatory of the University of Almeria in Calar Alto, Spain are shown. This is a contribution to help protect against natural disasters such as those caused by earthquakes and tsunamis.

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Section: Elf Sensormentioning

confidence: 99%

Applied Engineering Using Schumann Resonance for Earthquakes Monitoring

et al. 2017

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“…Dologlou, 2008), the emission of electro-magnetic waves (e.g. Gladychev et al, 2001), the increase in Radon emission from the ground (e.g. Richon et al, 2003), geodetic variations (abnormal ground elevations, e.g.…”

Section: Earthquake Forecasting: Some Possible Precursorsmentioning

confidence: 99%

Earthquake forecasting: a possible solution considering the GPS ionospheric delay

Agostino

Piras

2011

Nat. Hazards Earth Syst. Sci.

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Abstract. The recent earthquakes in L'Aquila (Italy) and in Japan have dramatically emphasized the problem of natural disasters and their correct forecasting. One of the aims of the research community is to find a possible and reliable forecasting method, considering all the available technologies and tools. Starting from the recently developed research concerning this topic and considering that the number of GPS reference stations around the world is continuously increasing, this study is an attempt to investigate whether it is possible to use GPS data in order to enhance earthquake forecasting. In some cases, ionospheric activity level increases just before to an earthquake event and shows a different behaviour 5-10 days before the event, when the seismic event has a magnitude greater than 4-4.5 degrees. Considering the GPS data from the reference stations located around the L'Aquila area (Italy), an analysis of the daily variations of the ionospheric signal delay has been carried out in order to evaluate a possible correlation between seismic events and unexpected variations of ionospheric activities. Many different scenarios have been tested, in particular considering the elevation angles, the visibility lengths and the time of day (morning, afternoon or night) of the satellites. In this paper, the contribution of the ionospheric impact has been shown: a realistic correlation between ionospheric delay and earthquake can be seen about one week before the seismic event.

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“…Therefore, Hayakawa et al developed the polarization method and found that the spectral power ratio of the vertical magnetic field (Z) to horizontal magnetic field (H) anomalously increased within the frequency range of 0.01 Hz prior to an earthquake on 8 August 1993 [12]. Polarization analysis has since been widely applied in seismic-electromagnetic studies [13][14][15][16][17][18][19]. In order to prevent the phenomenon that the amplitude of horizontal component (H) is small when the geomagnetic activity is weak but the polarization value increases abnormally, Ida and Li et al eliminated the geomagnetic data of the horizontal component with small amplitude during periods of weaker geomagnetic activity and developed an improved polarization method [5,20].…”

Section: Introductionmentioning

confidence: 99%

Detection of Geomagnetic Signals as Precursors to Some Earthquakes in China

2022

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Extracting weak seismic-magnetic signals from strong electromagnetic backgrounds has always been an important part of seismic-electromagnetic research. Based on the data of D/H/Z components measured through a three-axis ring-core-type fluxgate magnetometer in GLM (Geermu), JYG (Jiayuguan), and KSH (Kashi) observatories, we analyzed geomagnetic signals as precursors to some earthquakes in China using the polarization method. The most effective main frequency of seismic-electromagnetic emission was determined according to the skin effect. The results showed that only 5 out of 37 earthquakes were found to have probable signals of seismomagnetic anomalies before them. Further research revealed that the significant enhancements of polarization ratios of YZH and YZG (YZH, the spectral power ratio of Z to H and YZG, the spectral power ratio of Z to G) occurred five days prior to the Jinta earthquake (Ms5.4) and continued for about two months. The polarization ratio of YZH reached an abnormally high value about one month before some earthquakes (Ms7.4, Ms6.7, Ms6.7) near the KSH station and lasted for about one week to half a month, then returned to the normal value. Similarly, some enhancements of polarization ratios of YZH and YZG occurred two months before the Haixi earthquake (Ms5.0) and lasted for about one month. Analysis results showed that the enhancements prior to earthquake events may be closely related to the Jinta earthquake and a series of earthquakes near the KSH station; however, the high value of YZH and YZG in GLM station had nothing to do with the Haixi earthquake.

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Study of electromagnetic emissions associated with seismic activity in Kamchatka region

Cited by 9 publications

References 16 publications

Applied Engineering Using Schumann Resonance for Earthquakes Monitoring

Applied Engineering Using Schumann Resonance for Earthquakes Monitoring

Earthquake forecasting: a possible solution considering the GPS ionospheric delay

Detection of Geomagnetic Signals as Precursors to Some Earthquakes in China

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