Articles | Volume 12, issue 2
https://doi.org/10.5194/gi-12-231-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gi-12-231-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
A VLF/LF facility network for preseismic electromagnetic investigations
Patrick H. M. Galopeau
CORRESPONDING AUTHOR
LATMOS-CNRS, UVSQ Université Paris-Saclay, Guyancourt, France
Ashanthi S. Maxworth
Department of Engineering, University of Southern Maine, Gorham, ME, USA
Mohammed Y. Boudjada
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
Hans U. Eichelberger
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
Mustapha Meftah
LATMOS-CNRS, UVSQ Université Paris-Saclay, Guyancourt, France
Pier F. Biagi
Department of Physics, University of Bari, Bari, Italy
Konrad Schwingenschuh
Space Research Institute, Austrian Academy of Sciences, Graz, Austria
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Mohammed Y. Boudjada, Hans U. Eichelberger, Emad Al-Haddad, Werner Magnes, Patrick H. M. Galopeau, Xuemin Zhang, Andreas Pollinger, and Helmut Lammer
Adv. Radio Sci., 20, 77–84, https://doi.org/10.5194/ars-20-77-2023, https://doi.org/10.5194/ars-20-77-2023, 2023
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We investigate the variation of the electric power density linked to VLF signals emitted by NWC transmitter. The power density measurements were detected by the Electric Field Detector (EFD) instrument onboard CSES satellite above NWC station and its conjugate region (CR). The beam is subject to disturbances and modulations in CR. Above the NWC station, the beam can be considered as a hollow cone with inconsistency dependence of the half-opening angle on the electric power density.
Mohammed Y. Boudjada, Ahmed Abou el-Fadl, Patrick H. M. Galopeau, Eimad Al-Haddad, and Helmut Lammer
Adv. Radio Sci., 18, 83–87, https://doi.org/10.5194/ars-18-83-2020, https://doi.org/10.5194/ars-18-83-2020, 2020
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We investigate the solar Type III radio bursts recorded at about 10 AU by Cassini spacecraft. More than 300 bursts have been recorded by the RPWS experiment in the time interval from 01 Jan. 2008 to 31 Dec. 2014. We show that the solar Type III occurrence is mainly depending on the solar activity and also exhibits maxima and minima of detection. The source location of such solar bursts is the interplanetary medium because the dominant emission appears at frequency lower than 2.3 MHz.
Mohammed Y. Boudjada, Patrick H. M. Galopeau, Sami Sawas, Valery Denisenko, Konrad Schwingenschuh, Helmut Lammer, Hans U. Eichelberger, Werner Magnes, and Bruno Besser
Ann. Geophys., 38, 765–774, https://doi.org/10.5194/angeo-38-765-2020, https://doi.org/10.5194/angeo-38-765-2020, 2020
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In this paper, we report on observations of frequency-banded wave emissions by ICE (Instrument Champ Électrique) on board DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions). We distinguish two components: positive and negative frequency drift rates and multiple spaced frequency bands near the magnetic equatorial plane. We show and discuss the non-free-space DEMETER frequency-banded emissions and the free-space terrestrial kilometric radiation.
M. Y. Boudjada, P. H. M. Galopeau, M. Maksimovic, and H. O. Rucker
Adv. Radio Sci., 12, 167–170, https://doi.org/10.5194/ars-12-167-2014, https://doi.org/10.5194/ars-12-167-2014, 2014
M. Y. Boudjada, P. H. M. Galopeau, S. Sawas, and H. Lammer
Ann. Geophys., 32, 1119–1128, https://doi.org/10.5194/angeo-32-1119-2014, https://doi.org/10.5194/angeo-32-1119-2014, 2014
Mohammed Y. Boudjada, Hans U. Eichelberger, Emad Al-Haddad, Werner Magnes, Patrick H. M. Galopeau, Xuemin Zhang, Andreas Pollinger, and Helmut Lammer
Adv. Radio Sci., 20, 77–84, https://doi.org/10.5194/ars-20-77-2023, https://doi.org/10.5194/ars-20-77-2023, 2023
Short summary
Short summary
We investigate the variation of the electric power density linked to VLF signals emitted by NWC transmitter. The power density measurements were detected by the Electric Field Detector (EFD) instrument onboard CSES satellite above NWC station and its conjugate region (CR). The beam is subject to disturbances and modulations in CR. Above the NWC station, the beam can be considered as a hollow cone with inconsistency dependence of the half-opening angle on the electric power density.
Mohammed Y. Boudjada, Ahmed Abou el-Fadl, Patrick H. M. Galopeau, Eimad Al-Haddad, and Helmut Lammer
Adv. Radio Sci., 18, 83–87, https://doi.org/10.5194/ars-18-83-2020, https://doi.org/10.5194/ars-18-83-2020, 2020
Short summary
Short summary
We investigate the solar Type III radio bursts recorded at about 10 AU by Cassini spacecraft. More than 300 bursts have been recorded by the RPWS experiment in the time interval from 01 Jan. 2008 to 31 Dec. 2014. We show that the solar Type III occurrence is mainly depending on the solar activity and also exhibits maxima and minima of detection. The source location of such solar bursts is the interplanetary medium because the dominant emission appears at frequency lower than 2.3 MHz.
Mohammed Y. Boudjada, Patrick H. M. Galopeau, Sami Sawas, Valery Denisenko, Konrad Schwingenschuh, Helmut Lammer, Hans U. Eichelberger, Werner Magnes, and Bruno Besser
Ann. Geophys., 38, 765–774, https://doi.org/10.5194/angeo-38-765-2020, https://doi.org/10.5194/angeo-38-765-2020, 2020
Short summary
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In this paper, we report on observations of frequency-banded wave emissions by ICE (Instrument Champ Électrique) on board DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions). We distinguish two components: positive and negative frequency drift rates and multiple spaced frequency bands near the magnetic equatorial plane. We show and discuss the non-free-space DEMETER frequency-banded emissions and the free-space terrestrial kilometric radiation.
Alexander Rozhnoi, Maria Solovieva, Viktor Fedun, Peter Gallagher, Joseph McCauley, Mohammed Y. Boudjada, Sergiy Shelyag, and Hans U. Eichelberger
Ann. Geophys., 37, 843–850, https://doi.org/10.5194/angeo-37-843-2019, https://doi.org/10.5194/angeo-37-843-2019, 2019
Alain Hauchecorne, Laurent Blanot, Robin Wing, Philippe Keckhut, Sergey Khaykin, Jean-Loup Bertaux, Mustapha Meftah, Chantal Claud, and Viktoria Sofieva
Atmos. Meas. Tech., 12, 749–761, https://doi.org/10.5194/amt-12-749-2019, https://doi.org/10.5194/amt-12-749-2019, 2019
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This paper presents a new dataset of temperature profiles in the upper stratosphere and mesosphere acquired with the GOMOS spectrometer on board the European satellite ENVISAT. The principle is to observe the scattering of sunlight by air molecules at the Earth limb. The observed signal is proportional to the atmospheric density from which the temperature is derived. This technique provides a new source of information on temperature where satellite observations are sparse.
Dunya Alraddawi, Alain Sarkissian, Philippe Keckhut, Olivier Bock, Stefan Noël, Slimane Bekki, Abdenour Irbah, Mustapha Meftah, and Chantal Claud
Atmos. Meas. Tech., 11, 2949–2965, https://doi.org/10.5194/amt-11-2949-2018, https://doi.org/10.5194/amt-11-2949-2018, 2018
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The current study provides intercomparisons of various water vapour measurements in the Arctic. It compares ground-based GPS observations with satellite measurements in the infrared (IR), near-infrared (NIR) and visible (VIS) through a specific method allowing us to quantify their uncertainties and limits.
Unlike IR, satellite observations in NIR and VIS bands are mostly sensible to cloud cover during summer and to albedo variability over canopy or polluted snow-covered surfaces in winter.
Rémi Thiéblemont, Marion Marchand, Slimane Bekki, Sébastien Bossay, Franck Lefèvre, Mustapha Meftah, and Alain Hauchecorne
Atmos. Chem. Phys., 17, 9897–9916, https://doi.org/10.5194/acp-17-9897-2017, https://doi.org/10.5194/acp-17-9897-2017, 2017
M. Volwerk, I. Richter, B. Tsurutani, C. Götz, K. Altwegg, T. Broiles, J. Burch, C. Carr, E. Cupido, M. Delva, M. Dósa, N. J. T. Edberg, A. Eriksson, P. Henri, C. Koenders, J.-P. Lebreton, K. E. Mandt, H. Nilsson, A. Opitz, M. Rubin, K. Schwingenschuh, G. Stenberg Wieser, K. Szegö, C. Vallat, X. Vallieres, and K.-H. Glassmeier
Ann. Geophys., 34, 1–15, https://doi.org/10.5194/angeo-34-1-2016, https://doi.org/10.5194/angeo-34-1-2016, 2016
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The solar wind magnetic field drapes around the active nucleus of comet 67P/CG, creating a magnetosphere. The solar wind density increases and with that the pressure, which compresses the magnetosphere, increasing the magnetic field strength near Rosetta. The higher solar wind density also creates more ionization through collisions with the gas from the comet. The new ions are picked-up by the magnetic field and generate mirror-mode waves, creating low-field high-density "bottles" near 67P/CG.
P. Zhu, M. van Ruymbeke, Ö. Karatekin, J.-P. Noël, G. Thuillier, S. Dewitte, A. Chevalier, C. Conscience, E. Janssen, M. Meftah, and A. Irbah
Geosci. Instrum. Method. Data Syst., 4, 89–98, https://doi.org/10.5194/gi-4-89-2015, https://doi.org/10.5194/gi-4-89-2015, 2015
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The PICARD Bolometric Oscillation Sensor experiment was the first experiment to simultaneously measure the solar and terrestrial radiation with a single detector. It is a powerful tool for exploring thermal properties of a planetary body. The sensor has high repeatability due to its simplified design. Thus, it has the potential to payload on several microsatellites or even CubeSats and form a consultation array to track small energy exchange of the planet.
A. Rozhnoi, M. Solovieva, V. Fedun, M. Hayakawa, K. Schwingenschuh, and B. Levin
Ann. Geophys., 32, 1455–1462, https://doi.org/10.5194/angeo-32-1455-2014, https://doi.org/10.5194/angeo-32-1455-2014, 2014
M. Y. Boudjada, P. H. M. Galopeau, M. Maksimovic, and H. O. Rucker
Adv. Radio Sci., 12, 167–170, https://doi.org/10.5194/ars-12-167-2014, https://doi.org/10.5194/ars-12-167-2014, 2014
M. Y. Boudjada, P. H. M. Galopeau, S. Sawas, and H. Lammer
Ann. Geophys., 32, 1119–1128, https://doi.org/10.5194/angeo-32-1119-2014, https://doi.org/10.5194/angeo-32-1119-2014, 2014
M. Volwerk, C. Koenders, M. Delva, I. Richter, K. Schwingenschuh, M. S. Bentley, and K.-H. Glassmeier
Ann. Geophys., 31, 2201–2206, https://doi.org/10.5194/angeo-31-2201-2013, https://doi.org/10.5194/angeo-31-2201-2013, 2013
Related subject area
Electromagnetic
Developing a low-cost frequency-domain electromagnetic induction instrument
Autonomous-underwater-vehicle-based marine multicomponent self-potential method: observation scheme and navigational correction
A compact ocean bottom electromagnetic receiver and seismometer
A full waveform current recorder for electrical prospecting
A wireless monitoring system for a high-power borehole–ground electromagnetic transmitter
Background noise estimation of the geomagnetic signal
Multifunction waveform generator for EM receiver testing
Geoelectric monitoring at the Boulder magnetic observatory
A joint thermal and electromagnetic diagnostics approach for the inspection of thick walls
Electromagnetic system for detection and localization of miners caught in mine accidents
Improving of electrical channels for magnetotelluric sounding instrumentation
Near-magnetic-field scaling for verification of spacecraft equipment
Optimization of CPMG sequences to measure NMR transverse relaxation time T2 in borehole applications
Influence of high-latitude geomagnetic pulsations on recordings of broadband force-balanced seismic sensors
Gavin Wilson, Jacob Conrad, John Anderson, Andrei Swidinsky, and Jeffrey Shragge
Geosci. Instrum. Method. Data Syst., 11, 279–291, https://doi.org/10.5194/gi-11-279-2022, https://doi.org/10.5194/gi-11-279-2022, 2022
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The widespread availability of low-cost electronics has created new opportunities for affordable geophysical equipment. Electromagnetic geophysical methods allow users to examine the electrical properties of the ground. The Colorado School of Mines electromagnetic system (CSM-EM) is a proof of concept instrument capable of sensing shallow conductive objects and costs under USD 400 to build. We tested the system in a laboratory setting and validated it over a metal target outdoors.
Zhongmin Zhu, Jinsong Shen, Chunhui Tao, Xianming Deng, Tao Wu, Zuofu Nie, Wenyi Wang, and Zhaoyang Su
Geosci. Instrum. Method. Data Syst., 10, 35–43, https://doi.org/10.5194/gi-10-35-2021, https://doi.org/10.5194/gi-10-35-2021, 2021
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A new multicomponent electrical field observation system based on an autonomous underwater vehicle (AUV) was introduced for the measurement of seafloor self-potential. The system was tested in a lake and the multicomponent self-potential data were collected. The new SP system can be applied to marine SP observations, providing an efficient and low-noise SP acquisition method for marine resources and environmental investigations.
Kai Chen, Ming Deng, Zhongliang Wu, Xianhu Luo, and Li Zhou
Geosci. Instrum. Method. Data Syst., 9, 213–222, https://doi.org/10.5194/gi-9-213-2020, https://doi.org/10.5194/gi-9-213-2020, 2020
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Based on existing ocean bottom E-field (OBE) receiver specifications, including low noise levels, low power consumption, and low time drift errors, we integrated two induction coils for the magnetic sensor and a three-axis omnidirectional geophone for the seismic sensor to assemble an ultra-short baseline (USBL) transponder as the position sensor, which improved position accuracy and operational efficiency while reducing field data acquisition costs.
Kai Chen and Sheng Jin
Geosci. Instrum. Method. Data Syst., 8, 139–147, https://doi.org/10.5194/gi-8-139-2019, https://doi.org/10.5194/gi-8-139-2019, 2019
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The existing current recorder is inadequate for continuous recording, precision, bandwidth, dynamic range, and input range. A new full waveform current recorder that is ideal for measuring current signal for electrical prospecting applications is presented. The full waveform current recorder is capable of measuring current with bandwidth from DC to 10 kHz, with a power spectrum density noise floor of 10 A/rt(Hz) at 10 Hz.
Shuangshuang Cheng, Ming Deng, Meng Wang, Sheng Jin, Qisheng Zhang, and Kai Chen
Geosci. Instrum. Method. Data Syst., 8, 13–19, https://doi.org/10.5194/gi-8-13-2019, https://doi.org/10.5194/gi-8-13-2019, 2019
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High-power transmitters have been playing a significant role in deep electromagnetic exploration. However, a high-power transmitter needs high-voltage support, which is a potential risk for researchers. According to the actual situation of field exploration, we designed a wireless monitoring system. The system offers two advantages, the first of which is high security; the second advantage is simple operation.
Xiuyi Yao, Suqin Zhang, Yuntian Teng, and Dongmei Yang
Geosci. Instrum. Method. Data Syst., 7, 189–193, https://doi.org/10.5194/gi-7-189-2018, https://doi.org/10.5194/gi-7-189-2018, 2018
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A fast Fourier transform was applied to fit the geomagnetic diurnal variation. Fitting results showed that when the polynomial degree was greater than 160, the residual error was close to 0 nT. White noise is the main component of the residual error when the polynomial degree was greater than 160, so this method was adopted to calculate the background noise of the geomagnetic field. Spectrum analysis further demonstrated the necessity to remove background noise from geomagnetic data.
Kai Chen, Sheng Jin, and Ming Deng
Geosci. Instrum. Method. Data Syst., 7, 11–19, https://doi.org/10.5194/gi-7-11-2018, https://doi.org/10.5194/gi-7-11-2018, 2018
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To assess the performance of the developed EM receivers, this paper presents a multifunctional waveform generator with three waveforms: 1) a wideband, low-noise electromagnetic field signal to be used for magnetotelluric, audio-magnetotelluric, and long-period magnetotelluric studies; 2) a repeating frequency sweep square waveform for CSAMT and SIP studies; and 3) a “positive-zero–negative-zero” signal that contains primary and secondary fields for time-domain-induced polarization studies.
Cletus C. Blum, Timothy C. White, Edward A. Sauter, Duff C. Stewart, Paul A. Bedrosian, and Jeffrey J. Love
Geosci. Instrum. Method. Data Syst., 6, 447–452, https://doi.org/10.5194/gi-6-447-2017, https://doi.org/10.5194/gi-6-447-2017, 2017
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Despite its importance to a range of applied and fundamental studies, and obvious parallels to a robust network of magnetic-field observatories, long-term geoelectric field monitoring is rarely performed. The installation of a new geoelectric monitoring system at the Boulder magnetic observatory of the US Geological Survey is summarized. Data from the system are expected, among other things, to be used for testing and validating algorithms for mapping North American geoelectric fields.
Nicolas Le Touz, Jean Dumoulin, Gianluca Gennarelli, and Francesco Soldovieri
Geosci. Instrum. Method. Data Syst., 6, 81–92, https://doi.org/10.5194/gi-6-81-2017, https://doi.org/10.5194/gi-6-81-2017, 2017
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A numerical inversion approach to detect and localize inclusions in thick walls under quasi-periodic natural solicitations is presented. It is based on a preliminary analysis of surface temperature field evolution with time. This analysis is improved by taking advantage of a priori information provided by ground-penetrating radar reconstructions. In this way, it is possible to improve the accuracy of the images achievable with the stand-alone thermal reconstruction method.
Vira Pronenko and Fedir Dudkin
Geosci. Instrum. Method. Data Syst., 5, 561–566, https://doi.org/10.5194/gi-5-561-2016, https://doi.org/10.5194/gi-5-561-2016, 2016
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A new approach, based on the MRB magnetic field measurements radiated by two fixed and spaced RTI three-component magnetic field receivers and the solution of the inverse problem using these measurement results, was proposed and the concept of the MILES equipment for MRB search and localization was developed and successfully tested.
A. M. Prystai and V. O. Pronenko
Geosci. Instrum. Method. Data Syst., 4, 149–154, https://doi.org/10.5194/gi-4-149-2015, https://doi.org/10.5194/gi-4-149-2015, 2015
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The increase in the accuracy of the electric field measurement can significantly improve the quality of MT data. The paper deals with the peculiarities of the development of a new version of the instrument for the measurements of electric fields at
MT – both electric field sensors and the electrometer. The results of experimental tests of the new sensors and the electrometer included as a unit in the long-period magnetotelluric station LEMI-420 are given.
M. A. Pudney, C. M. Carr, S. J. Schwartz, and S. I. Howarth
Geosci. Instrum. Method. Data Syst., 2, 249–255, https://doi.org/10.5194/gi-2-249-2013, https://doi.org/10.5194/gi-2-249-2013, 2013
M. Ronczka and M. Müller-Petke
Geosci. Instrum. Method. Data Syst., 1, 197–208, https://doi.org/10.5194/gi-1-197-2012, https://doi.org/10.5194/gi-1-197-2012, 2012
E. Kozlovskaya and A. Kozlovsky
Geosci. Instrum. Method. Data Syst., 1, 85–101, https://doi.org/10.5194/gi-1-85-2012, https://doi.org/10.5194/gi-1-85-2012, 2012
Cited articles
Biagi, P. F., Colella, R., Schiavulli, L., Ermini, A., Boudjada, M., Eichelberger, H., Schwingenschuh, K., Katzis, K., Contadakis, M. E., Skeberis, C., Moldovan, I. A., and Bezzeghoud, M.: The INFREP Network: Present Situation and Recent Results, Open Journal of Earthquake Research, 8, 101–115, https://doi.org/10.4236/ojer.2019.82007, 2019. a, b, c
Bird, P.: An updated digital model of plate boundaries, Geochem. Geophys. Geosy., 4, 1027, https://doi.org/10.1029/2001GC000252, 2003. a
Boudjada, M. Y., Biagi, P. F., Al-Haddad, E., Galopeau, P. H. M., Besser, B., Wolbang, D., Prattes, G., Eichelberger, H., Stangle, G., Parrot, M., and Schwingenschuh, K.: Reception conditions of low frequency (LF) transmitter signals onboard DEMETER micro-satellite, Phys. Chem. Earth, 102, 70–79, https://doi.org/10.1016/j.pce.2016.07.006, 2017. a
Boudjada, M. Y., Eichelberger, H. U., Zhang, X., Magnes, W., Denisenko, V., Pollinger, A., Galopeau, P. H. M., Schwingenschuh, K., and Besser, B.: Analysis of ground-based very low frequency signal recorded onboard CSES satellite, in: 2021 Kleinheubach Conference, Miltenberg, Germany, 28–30 September 2021, 1–3, https://doi.org/10.23919/IEEECONF54431.2021.9598373, 2021. a
Bowman, D. D., Ouillon, G., Sammis, C. G., Sornette, A., and Sornette, D.: An observational test of the critical earthquake concept, J. Geophys. Res., 103, 24359–24372, https://doi.org/10.1029/98JB00792, 1998. a
Chen, H., Han, P., and Hattori, K.: Recent advances and challenges in the seismo-electromagnetic study: A brief review, Remote Sens., 14, 5893, https://doi.org/10.3390/rs14225893, 2022. a
Cicerone, R. D., Ebel, J. E., and Britton, J.: A systematic compilation of earthquake precursors, Tectonophysics, 476, 371–396, https://doi.org/10.1016/j.tecto.2009.06.008, 2009. a
Clilverd, M. A., Rodger, C. J., Thomson, N. R., Brundell, J. B., Ulich, T., Lichtenberger, J., Cobbett, N., Collier, A. B., Menk, F. W., Seppälä, A., Verronen, P. T., and Turunen, E.: Remote sensing space weather events: Antarctic-Arctic Radiation-belt (Dynamic) Deposition-VLF Atmospheric Research Konsortium network, Space Weather, 7, S04001, https://doi.org/10.1029/2008SW000412, 2009. a
De Santis, A., Abbattista, C., Alfonsi, L., Amoruso, L., Campuzano, S. A., Carbone, M., Cesaroni, C., Cianchini, G., De Franceschi, G., De Santis, A., Di Giovambattista, R., Marchetti, D., Martino, L., Perrone, L., Piscini, A., Rainone, M. L., Soldani, M., Spogli, L., and Santoro, F.: Geosystemics view of earthquakes, Entropy, 21, 412, https://doi.org/10.3390/e21040412, 2019. a
Dobrovolsky, I. P., Zubkov, S. I., and Myachkin, V. I.: Estimation of the size of earthquake preparation zones, Pure Appl. Geophys., 117, 1025–1044, https://doi.org/10.1007/BF00876083, 1979. a
Dowden, R. L., Brundell, J. B., and Rodger, C. J.: VLF lightning location by time of group arrival (TOGA) at multiple sites, J. Atmos. Sol.-Terr. Phy., 64, 817–830, https://doi.org/10.1016/S1364-6826(02)00085-8, 2002. a
Eichelberger, H., Schwingenschuh, K., Boudjada, M. Y., Besser, B. P., Wolbang, D., Rozhnoi, A., Solovieva, M., Biagi, P. F., Stachel, M., Aydogar, Ö., Muck, C., Grill, C., and Jernej, I.: Characterization of sub-ionospheric VLF/LF waveguides for seismic event studies during solar minimum, EGU General Assembly 2020, Vienna, Austria, 4–8 May 2020, https://doi.org/10.5194/egusphere-egu2020-15760, 2020. a
Eichelberger, H., Boudjada, M. Y., Schwingenschuh, K., Galopeau, P., Rozhnoi, A., Solovieva, M., Biagi, P., Fedun, V., and Besser, B. P.: Sub-ionospheric VLF/LF waveguide anomalies over Europe, in: Proceedings of the XXXIVth URSI General Assembly in Rome, Fr–GHE–AM1–1, https://www.ursi.org/proceedings/procGA21/papers/URSIGASS2021-Fr-GHE-AM1-1.pdf (last access: 15 November 2023), 2021. a
Eppelbaum, L. V.: VLF-method of geophysical prospecting: A non-conventional system of processing and interpretation (implementation in the Caucasian ore deposits), ANAS Transactions, Earth Sciences, 2/2021, 16–38, https://doi.org/10.33677/ggianas20210200060, 2021. a
Forbes, J. M.: The Equatorial Electrojet, Rev. Geophys. Space Ge., 19, 469–504, https://doi.org/10.1029/RG019i003p00469, 1981. a
Hayakawa, M.: VLF/LF Techniques, Chap. 5, John Wiley & Sons, Ltd., 139–197, https://doi.org/10.1002/9781118770368.ch5, 2015. a, b, c
Hayakawa, M. and Hobara, Y.: Current status of seismo-electromagnetics for short-term earthquake prediction, Geomat. Nat. Haz. Risk, 1, 115–155, https://doi.org/10.1080/19475705.2010.486933, 2010. a
Hayakawa, M., Molchanov, O. A., Ondoh, T., and Kawai, E.: The precursory signature effect of the Kobe earthquake on VLF subionospheric signals, J. Comm. Res. Lab. Tokyo, 43, 169–180, 1996. a
Hayakawa, M., Raulin, J. P., Kasahara, Y., Bertoni, F. C. P., Hobara, Y., and Guevara-Day, W.: Ionospheric perturbations in possible association with the 2010 Haiti earthquake, as based on medium-distance subionospheric VLF propagation data, Nat. Hazards Earth Syst. Sci., 11, 513–518, https://doi.org/10.5194/nhess-11-513-2011, 2011. a
Keilis-Borok, V.: Earthquake prediction: State-of-the-art and emerging possibilities, Annu. Rev. Earth Pl. Sc., 30, 1–33, https://doi.org/10.1146/annurev.earth.30.100301.083856, 2002. a
Lay, E. H., Holzworth, R. H., Rodger, C. J., Thomas, J. N., Pinto, O., and Dowden, R. L.: WWLL global lightning detection system: Regional validation study in Brazil, Geophys. Res. Lett., 31, L03102, https://doi.org/10.1029/2003GL018882, 2004. a
Maxworth, A., Lichtenberger, J., Liyanage, P., and Gołkowski, M.: First results from the ELF/VLF receiver in Sri Lanka, in: Proceedings of the XXXIVth URSI General Assembly in Rome, Fr–H01–AM2–3, https://www.ursi.org/proceedings/procGA21/papers/URSIGASS2021-Fr-H01-AM2-3.pdf (last access: 15 November 2023), 2021. a
Maxworth, A. S., Gołkowski, M., Cohen, M. B., Moore, R. C., Chorsi, H. T., Gedney, S. D., and Jacobs, R.: Multistation observations of the azimuth, polarization, and frequency dependence of ELF/VLF waves generated by electrojet modulation, Radio Sci., 50, 1008–1026, https://doi.org/10.1002/2015RS005683, 2015. a
Meftah, M., Boutéraon, T., Dufour, C., Hauchecorne, A., Keckhut, P., Finance, A., Bekki, S., Abbaki, S., Bertran, E., Damé, L., Engler, J.-L., Galopeau, P., Gilbert, P., Lapauw, L., Sarkissian, A., Vieau, A.-J., Lacroix, P., Caignard, N., Arrateig, X., Hembise Fanton d’Andon, O., Mangin, A., Carta, J.-P., Boust, F., Mahé, M., and Mercier, C.: The UVSQ-SAT/INSPIRESat-5 CubeSat mission: First in-orbit measurements of the Earth’s outgoing radiation, Remote Sens., 13, 1449, https://doi.org/10.3390/rs13081449, 2021. a
Meftah, M., Boust, F., Keckhut, P., Sarkissian, A., Boutéraon, T., Bekki, S., Damé, L., Galopeau, P., Hauchecorne, A., Dufour, C., Finance, A., Vieau, A.-J., Bertran, E., Gilbert, P., Caignard, N., Dias, C., Engler, J.-L., Lacroix, P., Grossel, K., Rannou, V., Saillant, S., Avelino, Y., Azoulay, B., Brand, C., Dominguez, C., Haasz, A., Paskeviciute, A., Segura, K., Maso, P., Ancelin, S., Mercier, C., Stee, V., Mangin, A., Bolsée, D., and Billard, C.: INSPIRE-SAT 7, a second CubeSat to measure the Earth's energy budget and to probe the ionosphere, Remote Sens., 14, 186, https://doi.org/10.3390/rs14010186, 2022. a
Meng, X., Vergados, P., Komjathy, A., and Verkhoglyadova, O.: Upper atmospheric responses to surface disturbances: An observational perspective, Radio Sci., 54, 1076–1098, https://doi.org/10.1029/2019RS006858, 2019. a
Molchanov, O., Rozhnoi, A., Solovieva, M., Akentieva, O., Berthelier, J. J., Parrot, M., Lefeuvre, F., Biagi, P. F., Castellana, L., and Hayakawa, M.: Global diagnostics of the ionospheric perturbations related to the seismic activity using the VLF radio signals collected on the DEMETER satellite, Nat. Hazards Earth Syst. Sci., 6, 745–753, https://doi.org/10.5194/nhess-6-745-2006, 2006. a
Nina, A., Biagi, P. F., Mitrović, S. T., Pulinets, S., Nico, G., Radovanović, M., and Popović, L. Č.: Reduction of the VLF signal phase noise before earthquakes, Atmosphere, 12, 444, https://doi.org/10.3390/atmos12040444, 2021. a
Parrot, M.: DEMETER Satellite and Detection of Earthquake Signals, Chap. 6, 115–138, CRC Press, Boca Raton, https://doi.org/10.1201/9781315166841, 2018. a
Raulin, J.-P., Correia de Matos David, P., Hadano, R., Saraiva, A. C. V., Correia, E., and Kaufmann, P.: The South America VLF NETwork (SAVNET), Earth, Moon Planets, 104, 247–261, https://doi.org/10.1007/s11038-008-9269-4, 2009. a, b
Samanes, J. E., Raulin, J.-P., Macotela, E. L., and Guevara Day, W. R.: Estimating the VLF modal interference distance using the South America VLF Network (SAVNET), Radio Sci., 50, 122–129, https://doi.org/10.1002/2014RS005582, 2015. a
Schirninger, C., Eichelberger, H. U., Magnes, W., Boudjada, M. Y., Schwingenschuh, K., Pollinger, A., Besser, B. P., Biagi, P. F., Solovieva, M., Wang, J., Cheng, B., Zhou, B., Shen, X., Delva, M., and Lammegger, R.: Satellite measured ionospheric magnetic field variations over natural hazards sites, Remote Sens., 13, 2360, https://doi.org/10.3390/rs13122360, 2021. a
Schwingenschuh, K., Prattes, G., Besser, B. P., Močnik, K., Stachel, M., Aydogar, Ö., Jernej, I., Boudjada, M. Y., Stangl, G., Rozhnoi, A., Solovieva, M., Biagi, P. F., Hayakawa, M., and Eichelberger, H. U.: The Graz seismo-electromagnetic VLF facility, Nat. Hazards Earth Syst. Sci., 11, 1121–1127, https://doi.org/10.5194/nhess-11-1121-2011, 2011. a
Shen, X., Zhang, X., Yuan, S., Wang, L., Cao, J., Huang, J., Zhu, X., Piergiorgio, P., and Dai, J.: The state-of-the-art of the China Seismo-Electromagnetic Satellite mission, Sci. China Technol. Sc., 61, 634–642, https://doi.org/10.1007/s11431-018-9242-0, 2018. a
Stern, R. J.: Subduction zones, Rev. Geophys., 40, 1012, https://doi.org/10.1029/2001RG000108, 2002. a
Yoshida, M., Yamauchi, T., Horie, T., and Hayakawa, M.: On the generation mechanism of terminator times in subionospheric VLF/LF propagation and its possible application to seismogenic effects, Nat. Hazards Earth Syst. Sci., 8, 129–134, https://doi.org/10.5194/nhess-8-129-2008, 2008. a
Zhang, X., Wang, Y., Boudjada, M. Y., Liu, J., Magnes, W., Zhou, Y., and Du, X.: Multi-experiment observations of ionospheric disturbances as precursory effects of the Indonesian Ms6.9 earthquake on August 05, 2018, Remote Sens., 12, 4050, https://doi.org/10.3390/rs12244050, 2020. a
Short summary
We present the implementation of a VLF/LF network to search for earthquake electromagnetic precursors. The proposed system will deliver a steady stream of real-time amplitude and phase measurements as well as a daily recording VLF/LF data set. The first implementation of the system was done in Graz, Austria. The second one will be in Guyancourt (France), with a third one in Réunion (France) and a fourth one in Moratuwa (Sri Lanka).
We present the implementation of a VLF/LF network to search for earthquake electromagnetic...