Ultra-low-frequency (ULF) and total electron content (TEC) anomalies observed at Agra and their association with regional earthquakes

Chauhan, Vishal Singh; Singh, O. P.; Kushwah, Vinod Kumar; Singh, Vishwakarma; Singh, Birbal

doi:10.1016/j.jog.2009.06.002

Cited by 19 publications

(13 citation statements)

References 33 publications

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“…The detection of ULF electromagnetic fields aims to equip seismic stations, in the south of Iberian Peninsula with threecomponent ULF magnetometers of type LEMI-30 (produced by the Lviv Centre of Space Research, Ukraine) as commonly used in ULF research, Chauhan et al (2009). A possible location for the initial two equipments is presented in Fig.…”

Section: Observation Of Ulf Magnetic Field Emissionsmentioning

confidence: 99%

“…It is known that low-frequency (ultra (ULF), very (VLF), and low-frequency (LF)) electromagnetic waves produce more convincing earthquake precursors (compared to higher frequencies) because of less contamination, large skin depth, and low attenuation, Chauhan et al (2009). Thus, two seismo-electromagnetic phenomena (SEM) will be considered: ULF electromagnetic field emissions, Telesca et al (2008), and VLF/LF radio broadcastings, Biagi et al (2009).…”

Section: Introductionmentioning

confidence: 99%

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Seismo-electromagnetic phenomena in the western part of the Eurasia-Nubia plate boundary

Silva

Bezzeghoud

Rocha

et al. 2011

Nat. Hazards Earth Syst. Sci.

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Abstract. This paper presents a work that aims to monitor seismo-electromagnetic phenomena in the Western Part of the Eurasia-Nubia Plate Boundary. This region has a significant tectonic activity combined with relatively low electromagnetic noise levels, rendering high quality seismoelectromagnetic measurements possible. An overview of the seismicity of this region is presented and the research plan is discussed accordingly.

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Section: Observation Of Ulf Magnetic Field Emissionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seismo-electromagnetic phenomena in the western part of the Eurasia-Nubia plate boundary

Silva

Bezzeghoud

Rocha

et al. 2011

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

show abstract

“…Although individual seismo-electromagnetic parameters have shown their success to identify precursors, a considerable amount of false seismogenic anomalies are presumably due to other geophysical phenomena and local interferences. Therefore monitoring of different electromagnetic parameters has been proposed recently to enhance the success rate of identifying seismogenic anomalies [16] [17] [18].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Study of VLF/ULF Anomalies Associated with Earthquakes in Japan

Singh¹,

Hobara²

2020

OJER

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We carried out a simultaneous study of ground-based magnetic field and lower ionospheric anomalies during major earthquakes occurring around Japan in 2010 and 2012. Ultra Low Frequency (ULF) geomagnetic field waveforms of Esashi station and Very Low Frequency (VLF) Japanese transmitter (JJY) electric signal amplitude received in Moshiri station Hokkaido during nighttime (22:00-02:00 LT) were used to minimize the local interference. Twenty earthquakes having magnitude greater than 5.5 were considered for the data analysis for two years. Nighttime amplitude fluctuations and polarization from the received VLF transmitter signal amplitude and ULF magnetic field respectively were calculated to identify anomalous signatures in relation to every earthquake. We found most earthquakes analyzed indicating VLF amplitude anomalies simultaneously occurred with ULF magnetic field anomalies within a week prior to the earthquakes. Stronger anomalies were observed for larger magnitude and shallower earthquakes. Focal mechanism of earthquakes was also examined to identify the effectiveness of generating anomaly. Both VLF and ULF anomalies were observed for reverse fault type earthquakes occurring under the strong pressure in the crust. Obtained results may indicate the common anomaly source both for VLF and ULF in the lithosphere and are consistent with currently proposed Lithosphere-Atmosphere-Ionosphere (LAI) coupling scenarios during the earthquake preparation period.

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“…The features that are important in all sensing methods are low power consumption, low price, being unaffected by environmental changes, high precision, high reliability and stability. Some remote sensing methods used from past to present include electromagnetic induction (EMI) [1][2][3][4][5], ground effect radar (GPR) [6][7][8][9][10][11] and magnetic anomaly [12][13][14][15]18]. Magnetic anomaly is the most widely used remote sensing method due to its low price, low number of equipment and changeable sensitivity.…”

Section: Introductionmentioning

confidence: 99%

A Fluxgate Sensor Application : Coin Identification

Çıtak¹,

Çoramık²,

Ege³

2016

SIPIJ

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Today, coins are used to operate many electric devices that are open to the public service. Washing machines, play stations, computers, auto brooms, foam machines, beverage machines, telephone chargers, hair dryers and water heaters are some examples of these devices These devices include coin recognition systems. In these systems, there are coils at two different radius, which become electromagnets when the current is passed through them. The AC current supplied to the coils creates a variable magnetic field, which induces the eddy current on the coil during the passing of money. The magnetic field generated by the Eddy current reduces the current passing through the coil. The amount of change of current in the coil gives information about the coin; the type of metal (element) and the amount of metal (element). In this study, a new coin identification system (magnetic measurement system) is designed. In this system, the magnetic anomaly generated by the coin as a result of applying direct current to the coils is tried to be detected by fluxgate sensor. In this study, sensor voltages are acquired in computer environment by using developed electronic unit and LabVIEW based software. In the paper, experimental results have been discussed in detail.

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Ultra-low-frequency (ULF) and total electron content (TEC) anomalies observed at Agra and their association with regional earthquakes

Cited by 19 publications

References 33 publications

Seismo-electromagnetic phenomena in the western part of the Eurasia-Nubia plate boundary

Seismo-electromagnetic phenomena in the western part of the Eurasia-Nubia plate boundary

Simultaneous Study of VLF/ULF Anomalies Associated with Earthquakes in Japan

A Fluxgate Sensor Application : Coin Identification

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