Seismoelectromagnetic Effect Associated with the Izmit Earthquake and Its Aftershocks

Matsushima, Masaki; Honkura, Yoshimori; Oshiman, Naoto; Barış, Şerif; Tunçer, Mustafa; Tank, Sabri Bülent; Çelik, Cengiz; Takahashi, Futoshi; Nakanishi, M.; Yoshimura, Ryokei; Pektaş, R.; Komut, Tolga; Tolak, E.; Ito, Akihiko; Iio, Yoshihisa; Işıkara, A. M.

doi:10.1785/0120000807

Cited by 78 publications

(63 citation statements)

References 16 publications

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“…Belov et al [8] detected associated electromagnetic fields about 10 seconds before the seismic wave arrival and 4 seconds after the origin time. The ULF band field changes were detected some 0.3-0.8 seconds before P wave arrival and about three seconds after the origin time during the Izmit earthquake [13,24] and between the P wave arrival and the origin time during the 1995 Hyogoken-Nanbu earthquake [11]. The VLF band pulse-like signals were detected about 1,000 km from the fault at about the origin time of the great earthquake east of Hokkaido on October 4, 1994 [10].…”

Section: Introductionmentioning

confidence: 96%

Remote Detection of the Electric Field Change Induced at the Seismic Wave Front from the Start of Fault Rupturing

Fujinawa¹,

Takahashi²,

Noda³

et al. 2011

International Journal of Geophysics

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Seismic waves are generally observed through the measurement of undulating elastic ground motion. We report the remote detection of the Earth's electric field variations almost simultaneously with the start of fault rupturing at about 100 km from the fault region using a special electric measurement. The rare but repeated detection indicates that the phenomenon is real. The characteristic time of diffusion is almost instantaneous, that is, less than 1 second to travel 100 km, more than ten times faster than ordinary seismic P wave propagation. We suggest that the measured electric field changes are produced by the electrokinetic effect through increased pore water pressure of the seismic pulse. It is also suggested that the long range propagation is due to the surface wave mode confined near the interface of the different conductivity. The length scale of the finite strength of the electric field is 16 km, 160 km for electric conductivity of 0.01, 0.001, Sm −1 , respectively. This phenomenon suggests a new seismic sensing method and a new earthquake early warning system providing more seconds of lead time.

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Section: Introductionmentioning

confidence: 96%

Remote Detection of the Electric Field Change Induced at the Seismic Wave Front from the Start of Fault Rupturing

Fujinawa¹,

Takahashi²,

Noda³

et al. 2011

International Journal of Geophysics

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“…Pride and Morgan, 1991;Gershenzon, 1992;Pride, 1994;Pride and Haartsen, 1996;Haartsen and Pride, 1997;Garambois and Dietrich, 2002;Huang, 2002;Ren et al, 2010a, b). Appearance of unambiguous electric field changes was mostly synchronized with the arrival of seismic wave (Yamada and Murakami, 1982;Honkura et al, 2000Mogi et al, 2000;Nagao et al, 2000;Matsushima et al, 2002;Ujihara et al, 2004). Recently we proposed a new mechanism for electric field generation by seismic wave or more specifically by ground motion, based on some observational examples (Honkura et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Spectral peaks in electric field at resonance frequencies for seismically excited motion of ions in the Earth’s magnetic field

et al. 2011

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Clear electric field variations have been observed during the passage of seismic wave. The most notable feature is circular polarization of electric field and it has been interpreted as reflecting circular motion of ions in groundwater under the Earth's magnetic field. We have called such a mechanism 'seismic dynamo effect' but more convincing evidence is required to support this mechanism. Here we show strong evidence in terms of transfer function relating the electric field to the ground velocity due to seismic wave. We estimate transfer functions for electric field and ground velocity records for five aftershocks after the occurrence of M 6.9 earthquake. Then some peaks in the transfer function are found at specific frequencies where the resonance of ion motion in groundwater with the Earth's magnetic field is expected. This result clearly supports the mechanism, which provides a method for in-situ estimation of ion contents in groundwater.

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“…Karakelian et al, 2002;Matsushima et al, 2002;Nagao et al, 2000) have documented the observation of magnetic and electric signals shortly after the occurrence of an earthquake. Such signals are observed in all the components of electric and magnetic fields for some tens of seconds.…”

Section: Possible Generation Mechanismsmentioning

confidence: 99%

Some comments on the potential seismogenic origin of magnetic disturbances observed by Di Lorenzo et al. (2011) close to the time of the 6 April 2009 L'Aquila earthquake

Masci

Luca

2013

Nat. Hazards Earth Syst. Sci.

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In this paper we provide comments about the potential seismogenic origin of magnetic disturbances that Di Lorenzo et al. (2011) observed from few minutes before to about one hour after the 6 April 2009 L'Aquila earthquake. The coincidence with the earthquake induced the authors to think that the observed magnetic signals were linked to the main phase of the seismic event. Here, we will discuss the unusual polarization in the X–Z plane of the magnetic disturbances observed by Di Lorenzo et al. (2011), the model of source that the authors have proposed for the generation of these signals, and the time length of the magnetic data set shown in their paper. We will also discuss some possible generation mechanisms for electromagnetic seismogenic signals that could support the authors' findings. Finally, we will consider seismic and geodetic data from L'Aquila area just before and after the 6 April 2009 earthquake. We conclude that there is no evidence to support the hypothesis that magnetic disturbances documented by Di Lorenzo et al. (2011) had a seismogenic origin

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Seismoelectromagnetic Effect Associated with the Izmit Earthquake and Its Aftershocks

Cited by 78 publications

References 16 publications

Remote Detection of the Electric Field Change Induced at the Seismic Wave Front from the Start of Fault Rupturing

Remote Detection of the Electric Field Change Induced at the Seismic Wave Front from the Start of Fault Rupturing

Spectral peaks in electric field at resonance frequencies for seismically excited motion of ions in the Earth’s magnetic field

Some comments on the potential seismogenic origin of magnetic disturbances observed by Di Lorenzo et al. (2011) close to the time of the 6 April 2009 L'Aquila earthquake

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