Electrokinetic effect combined with surface-charge assumption: a possible generation mechanism of coseismic EM signals

Ren, Hengxin; Wen, Jian; Huang, Qinghua; Chen, Xiaofei

doi:10.1093/gji/ggu435

Cited by 54 publications

(48 citation statements)

References 61 publications

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“…Many scientists (Honkura et al 2002;Abdul Azeez et al 2009;Widarto et al 2009;Gao et al 2014) conducted observations and simulations, and proposed mechanism to explain co-seismic magnetic pulsations. We compare our results with these studies, and find our low-frequency magnetic pulsations most likely result from motions of ground water due to seismic waves (i.e., electro-kinetic effect) observed by Abdul Azeez et al (2009) and simulated by Ren et al (2012Ren et al ( , 2015Ren et al ( , 2016, while the high-frequency ones are due to shaking/tilting effects (i.e., magnetometer coil motion) reported by Widarto et al (2009) and Gao et al (2014). It has been found that the co-seismic signatures of the geophone and magnetometer at CC (i.e., Chung Cheng University) are very different from those at the rest stations.…”

Section: Experiments Setup and Observationsupporting

confidence: 52%

Co-seismic signatures in magnetometer, geophone, and infrasound data during the Meinong Earthquake

Liu¹,

Chen²,

Wu³

et al. 2017

Terr. Atmos. Ocean. Sci.

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This paper utilizes 10 stations of co-located seismometer, QuakeFinder/infrasound to observe co-seismic signatures triggered by the 6 February 2016 M 6.6 Meinong Earthquake. Each QuakeFinder system consists of a 3-axes induction magnetometer, an air conductivity sensor, a geophone, and temperature/relative humidity sensors. There are no obvious charges in the positive/negative ions, the temperature, and the humidity, while the magnetometer, the geophone, and infrasound data detect clear co-seismic signatures, similar to seismic waves recorded by seismometers. The magnetometers register high-frequency pulsations, like seismic waves, and superimpose with low-frequency variations, which could be caused by the magnetometer shaking/tilting and/or the underground water level change, respectively, upon the arrival of seismic waves. The spectrum centering around 2.0 Hz of the co-seismic geophone fluctuations is similar to that of the seismic waves. However, the energy of co-seismic geophone fluctuations (also magnetometer pulsations) yields an exponential decay to the distance of a station to the epicenter, while the energy of the seismic waves is inversely proportional to the square of the distance. This suggests that the mechanisms for detecting seismic waves of the QuakeFinder system and seismometers are different. In general, the geophone and magnetometer/infrasound system are useful to record high-and low-frequency seismic waves, respectively.

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Section: Experiments Setup and Observationsupporting

confidence: 52%

Co-seismic signatures in magnetometer, geophone, and infrasound data during the Meinong Earthquake

Liu¹,

Chen²,

Wu³

et al. 2017

Terr. Atmos. Ocean. Sci.

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“…Currently, numerical simulation for the coseismic (fracture) change of electromagnetic field at crash has been conducted [18,19]. The change of electromagnetic field at a site far from explosion point is not affected by heat and water so much, and hence its cause is not the change of magnetization as described above, but other mechanism may result in such change.…”

Section: Change Of Magnetic Fieldmentioning

confidence: 99%

Induced Change of Electric Self‐Potential and Magnetic Field at the Artificial Explosion

Sakai

Kobayashi

Izumi³

et al. 2017

Elect Comm in Japan

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Study of the electric self-potential (SP) and the magnetic field was conducted at the explosion seismic experiment in Ooyama, Toyama Prefecture. The explosion was induced by 450-kg gun powder placed at a depth of 32.2 m to 75 m. The SP was measured by four electrodes arranged in a line crossing the explosion point, where the distance of each electrode from the explosion ranged from 10 m to 100 m. Induced SP changes consisted of two portions, namely, fluctuations with shorter period (∼10 ms) and fluctuations with longer periods (∼50 ms). Regarding the latter, the amplitude was in proportion to the span length of electrode couples and the fluctuations arrived faster at the electrode couples nearer to the explosion. Furthermore, the increment of ground level in SP was observed in each electrode couple after the explosion, which was concordant with the distribution of apparent resistivity underground studied by the survey. The magnetic field measured by the fluxgate magnetometer at the site 35 m north from the explosion also showed change of a few nT after the explosion. This may have been caused by change of magnetic properties underground. C⃝ 2017 Wiley Periodicals, Inc. Electron Comm Jpn, 100(3): 68-75, 2017; Published online in Wiley Online Library (wileyonlinelibrary.com).

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“…A study on selective numerical simulation of SES sites (Huang and Lin 2010) indicated that the electrical differences of surface media affected the distribution of geoelectric fields. Based on electrokinetic effects (Ren et al 2012(Ren et al , 2015 and rock fissure water (charge) seepage model of tidal geoelectric fields, significant leaps or jumps in E SP at the site may occur in rock mass shear fracture (Tan et al 2014). On May Fig.…”

Section: Characteristics Of Trend Variation In the Spontaneous Field mentioning

confidence: 99%

Correlation between abnormal trends in the spontaneous fields of tectonic plates and strong seismicities

Tan

Xin

2017

Earthq Sci

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Tectonic activities, electrical structures, and electromagnetic environments are major factors that affect the stability of spontaneous fields. The method of correlating regional synchronization contrasts (CRSC) can determine the reliability of multi-site data trends or shortimpending anomalies. From 2008 to 2013, there were three strong earthquake cluster periods in the North-South seismic belt that lasted for 8-12 months. By applying the CRSC method to analyze the spontaneous field E SP at 25 sites of the region in the past 6 years, it was discovered that for each strong earthquake cluster period, the E SP strength of credible anomalous trends was present at minimum 30% of the stations. In the southern section of the Tan-Lu fault zone, the E SP at four main geoelectric field stations showed significant anomalous trends after June 2015, which could be associated with the major earthquakes of the East China Sea waters (M S 7.2) in November 2015 and Japan's Kyushu island (M S 7.3) in April 2016.

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Electrokinetic effect combined with surface-charge assumption: a possible generation mechanism of coseismic EM signals

Cited by 54 publications

References 61 publications

Co-seismic signatures in magnetometer, geophone, and infrasound data during the Meinong Earthquake

Co-seismic signatures in magnetometer, geophone, and infrasound data during the Meinong Earthquake

Induced Change of Electric Self‐Potential and Magnetic Field at the Artificial Explosion

Correlation between abnormal trends in the spontaneous fields of tectonic plates and strong seismicities

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