Correction of the electromagnetic monitoring data for tidal variations of apparent resistivity

Saraev, A.; Pertel, M.I.; Malkin, Zinovy

doi:10.1016/s0926-9851(01)00101-x

Cited by 11 publications

(9 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the possibility and physical mechanism of far-field anomalous seismogenic signals recorded by geoelectrical observation were demonstrated and discussed from multi-aspect. It is thought that although geoelectrical field and earth resistivity are not the direct observational tools to detect stress and strain field, they are well sensitive to weak stress-strain response Saraev et al, 2002), so they can note down some anomalies forming during the process of earthquake preparation. The anomaly characteristics of geoelectrical tidal waves before strong earthquakes are mainly owing to the destroy of stress-strain constitutive relation during earthquake preparation, and the electric field resonance effects similar to tidal wave due to the influence of tidal force, which propagates in free space or crustal media to distant stations, and adds on the normal records of stations, producing anomalous phenomenon of amplitude increasing or decreasing in geoelectrical tidal wave records.…”

Section: Discussionmentioning

confidence: 99%

“…In this paper, geoelectrical tidal waves recorded at geoelectric observational stations are selected to reflect far-field anomalous information. Saraev et al (2002) obtained that the correlated coefficient is 0.95 between earth resistivity and tidal variation in the observation of low frequency electromagnetic field. The experiences using electromagnetic field to detect gravitational wave has been carried out in some countries, and the facts illustrate it feasible (SHI and CHENG, 2004).…”

Section: Reliability Of Far-field Geoelectrical Field Anomaliesmentioning

confidence: 97%

“…The kinetic electrical potential underground is represented generally as ΔU=0.77ρ ω Δp (CHEN et al, 1999), in which ρ ω is resistivity of fluid, and Δp is pressure difference that contains tidal force and static stress in focal region. The overlapping of static stress in focal area and tidal force will form a kind of stress-strain anomalous signals similar to tidal wave, leading to "sponge effect" in media and pore liquid in it (Saraev et al, 2002), and then will also excite geoelectrical anomalous signals with semblable periods, propagating long distance in free space and crust. When this anomaly occurred in geoelectrical stations, it will interact with the environmental electromagnetic field and normal geoelctrical tidal waves on stations, resulting in geoelctrical tidal amplitude increase when it is with identical phase as the normal records, or discrease, distorting even disappearance of geoelectrical tidal waves when their phases differ greatly.…”

Section: Formation Mechanism Of Anomaliesmentioning

confidence: 99%

See 2 more Smart Citations

Tidal wave anomalies of geoelectrical field before remote earthquakes

et al. 2007

View full text Add to dashboard Cite

In this paper, geoelectrical field anomalies at Changli and Xingji station in Hebei Province were analyzed before five remote earthquakes. It was found that the anomalies mainly occurred two or three months before earthquakes, which is of importance to short-term and impendent earthquake prediction. There exhibited different characteristics in geoelectrical field anomalies, but they were closely related to tidal waves, for example, the increasing in amplitude at semidiurnal and semimonthly periods of tidal waves; the decreasing or disappearing in amplitude of tidal waves that should have been recorded normally at that time; while there accompanied incremental signals with high frequency, such as jump variations. It was thought that the formation mechanism of the geoelectrical anomalies before strong earthquakes resulted from stress-strain resonance effects when rock was weakened during the preparation process in seismic area, and then signals of electric field propagated to remote stations in free space or crust, and superposed on the geoelectric field tidal waves recorded at the stations, leading to increasing or decreasing in amplitude of geoelectrical tidal waves. The high frequency signals may be related to the variation of rock porosity, permeability and so on beneath the stations, as a result of the dynamic effects of remote earthquakes.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Reliability Of Far-field Geoelectrical Field Anomaliesmentioning

confidence: 97%

Section: Formation Mechanism Of Anomaliesmentioning

confidence: 99%

See 1 more Smart Citation

Tidal wave anomalies of geoelectrical field before remote earthquakes

et al. 2007

View full text Add to dashboard Cite

show abstract

“…The experiments empirically indicate (Saraev, personal communication, 1999;Saraev et al, 2002) that the electromagnetic anomaly caused by an earthquake with M S 5.0 can be detected within the distance of about 200−300 km from the epicenter. Therefore it can be reasonably considered that the increased electromagnetic variation from May 10 to 12 is due to the crustal deformation before the earthquake.…”

Section: Earthquake Monitoring Using Artificial Slf Electromagnetic Smentioning

confidence: 99%

Electromagnetic anomaly before earthquakes measured by electromagnetic experiments

et al. 2009

View full text Add to dashboard Cite

Three experiments are carried out for earthquake monitoring using electromagnetic (EM) methods in recent years. Some earthquakes occurred in chance of the measurement time period for each experiment and the anomalies were recorded before the shocks. The observation at a site 20 km away from the epicenter of Zhangbei M S 6.2 earthquake in 1998 shows that the apparent resistivity decreases in the strike direction before and/or during the earthquake and the resistivity increases in the decline direction. This anomalous variation in apparent resistivity accounts for about 20%. The apparent resistivities at a site in the epicentral area decrease in the strike and decline directions before and/or during the earthquake and increase after shocks. The experiments using artificial electromagnetic signals with super low frequency carried out in 1999 show that the resolution and stability of electric and magnetic spectra are improved. The spectra of electric and magnetic fields and apparent resistivity at the Baodi station began to anomalously change two days before the Qian'an earthquake with 120 km distant to the station. The anomalous variation of electric and magnetic spectra is about twice as great as normal variation and the apparent resistivity changes by about 20%. The measurements in active seismic area of Yunnan province in the year 2005 indicate that the electric and magnetic spectra anomalously change by one order before the Taoyuan earthquake about 100 km away from the observatories. But the measurements at the sites in Beijing area 2 000 km away from the epicenter do not show any anomaly.

show abstract

“…The papers Ogawa, 1982, 1994) concern the observations of electromagnetic radiation in the LF and VLF ranges related to the occurrence of an earthquake. The results of the complex investigation of the variations of crust electrical resistivity as a function of tidal deformations on the basis of extremely low frequency radio station, which permit the hope for an increase in the reliability of electromagnetic-based earthquake prediction, are presented in paper of Saraev et al (2002).…”

Section: Introductionmentioning

confidence: 99%

On the reliability of the geomagnetic quake as a short time earthquake's precursor for the Sofia region

Mavrodiev

2004

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract.The local "when" for earthquake prediction is based on the connection between geomagnetic "quakes" and the next incoming minimum or maximum of tidal gravitational potential. The probability time window for the predicted earthquake is for the tidal minimum approximately ±1 day and for the maximum ±2 days. The preliminary statistic estimation on the basis of distribution of the time difference between occurred and predicted earthquakes for the period 2002-2003 for the Sofia region is given.The possibility for creating a local "when, where" earthquake research and prediction NETWORK is based on the accurate monitoring of the electromagnetic field with special space and time scales under, on and over the Earth's surface. The periodically upgraded information from seismic hazard maps and other standard geodetic information, as well as other precursory information, is essential.

show abstract

Correction of the electromagnetic monitoring data for tidal variations of apparent resistivity

Cited by 11 publications

References 3 publications

Tidal wave anomalies of geoelectrical field before remote earthquakes

Tidal wave anomalies of geoelectrical field before remote earthquakes

Electromagnetic anomaly before earthquakes measured by electromagnetic experiments

On the reliability of the geomagnetic quake as a short time earthquake's precursor for the Sofia region

Contact Info

Product

Resources

About