Magnetic field variations associated with SES : The instrumentation used for investigating their detectability

スポンサーリンク

概要

• 論文の詳細を見る

• Small amplitude Seismic Electric Signals (SES), are not accompanied by readily detectable variations of the horizontal components of the magnetic field. This does not hold for strong SES activities, i.e., before earthquakes with M-6.5 at epicentral distances of -100 [km]. The instrumentation used to obtain such conclusions is described. Attention is focused on a careful calibration of the coil magnetometers that were in operation at loannina station when the strong SES activities associated with the 6.6 earthquake at Grevena-Kozani were recorded. These magnetometers act as dB/dt detectors for periods longer than around half a second; furthermore their output is“neutralized”after 200 [ms] from the“arrival”of a fast step magnetic variation. In other words, a signal recorded by these magnetometers should correspond to a magnetic variation that has“arrived”at the sensor less than 200 [ms] before the recording. This property is critical for the study of the time difference between the variations in the electric and the magnetic fields. The variations in these fields“arrive”simultaneously (within experimental accuracy) from the usual nearby artificial sources, while for magnetotellurics the magnetic recordings“precede”those of the electric field. Both behaviors differ from that observed in the case of strong SES activities, a matter described in the accompanying paper.

• 日本学士院の論文

著者

• Varotsos Panayiotis

  Solid Earth Physics Institute University Of Athens

• SARLIS 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

• Detection of electromagnetic earthquake precursory signals in Greece
• 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

スポンサーリンク