Field experimentation on the detectability of co-seismic electric signals

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概要

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• Simultaneous electric, magnetic and seismic measurements in Greece show that, for epicentral distances of the order of 100km and for M6 class earthquakes, no electric disturbances in the frequency range DC to 50Hz are recorded at earthquake origin time. Electric disturbances are recorded only during the arrival of seismic waves and have the following properties: (a) The amplitude does not scale with the dipole length and may significantly differ for parallel horizontal short dipoles located at neighboring sites. (b) The amplitude of the vertical component does not exceed the strongest horizontal one. (c) The data collected with a sampling rate of 50Hz, show that strong frequency content lies in the range up to around 2.5 Hz and the disturbances vanish at frequencies less than 0.1Hz and more than 5Hz, providing an explanation on the absence of these disturbances in the usual VAN real time records. These disturbances are accompanied with magnetic variations recorded either by coil and/or by torsion photoelectric magnetometers. It is not yet clear whether the magnetic variations are solely due, or not, to“vibrations”of the magnetometers upon the arrival of seismic waves. Electric disturbances were also recorded upon the arrival of seismic waves of the Izmit, Turkey, earthquake of August 17, 1999 in most of our stations. However, no pronounced electric disturbances were recorded during the Athens earthquake of September 7, 1999, neither for the Turkish event of November 12, 1999. The basic results of this paper are compatible with those reported by Uyeda et al.1)

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著者

• KAPIRIS Panayiotis

  Solid Earth Physics Institute, University of Athens

• Varotsos Panayiotis

  Solid Earth Physics Institute University Of Athens

• Bogris Nikos

  Solid Earth Physics Institute University Of Athens

• SKORDAS Efthimios

  Solid Earth Physics Institute, University of Athens

• SKORDAS Efthimios

  Solid Earth Physics Institute, Physics Department, University of Athens

関連論文

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• What happened before the last five strong earthquakes in Greece: Facts and open questions
• Magnetovariational and Magnetotelluric study of Ioannina region sensitive to Seismic Electric Signals (SES). I
• Magnetic field variations associated with the SES before the 6.6 Grevena-Kozani earthquake
• Magnetic field variations associated with SES : The instrumentation used for investigating their detectability
• A plausible universal behaviour of earthquakes in the natural time-domain
• On the difference in the rise times of the two SES electric field components
• Field experimentation on the detectability of co-seismic electric signals

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