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Teisseyre, R.
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Teisseyre, R.
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- PublicationOpen AccessSeismic rotation waves: basic elements of theory and recording(2003)
; ; ; ; ; ;Teisseyre, R.; Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland ;Suchcicki, J.; Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland ;Teisseyre, K. P.; Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland ;Wiszniowski, J.; Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland ;Palangio, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; Returning to the old problem of observed rotation effects, we present the recording system and basic elements of the theory related to the rotation fi eld and its association with seismic waves. There can be many different causes leading to observed/recorded rotation effects; we can group them as follows: generation of micro-displacement motion due to asymmetry of source processes and/or due to interaction between seismic body/surface waves and medium structure; interaction between incident seismic waves and objects situated on the ground surface. New recording techniques and advanced theory of deformation in media with defects and internal (e.g., granular) structure make it possible to focus our attention on the fi rst group, related to microdisplacement motion recording, which includes both rotation and twist motions. Surface rotations and twists caused directly by the action of emerging seismic waves on some objects situated on the ground surface are considered here only in the historical aspects of the problem. We present some examples of experimental results related to recording of rotation and twist components at the Ojcow Observatory, Poland, and L'Aquila Observatory, Italy, and we discuss some prospects for further research.275 548 - PublicationOpen AccessElectromagnetic radiation related to dislocation dynamics in a seismic preparation zone(2002)
; ; ;Teisseyre, R.; Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland ;Ernst, T.; Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland; Electromagnetic emission is observed frequently before earthquakes as high noise level in VLF and ULF bands. We present theoretical considerations on electromagnetic radiation caused by dislocation dynamics in the preseismic micro-sources (micro-crackings) located in an earthquake preparation zone. Some of these micro-sources could be located near the ground surface and their electromagnetic signals could be accesible in some recording stations. The examples of the numerically simulated induction and radiation fields are given and one example of the observed radio-noise recording is shown.148 219 - PublicationOpen AccessMagnetic variation analysis for the June 1993 seismic events in Central Italy(1997-03)
; ; ; ; ; ;Ernst, T.; Institute of Geophysics, Warszawa, Poland ;Teisseyre, R.; Institute of Geophysics, Warszawa, Poland ;Meloni, A.; Istituto Nazionale di Geofisica, Roma, Italy ;Palangio, P.; Istituto Nazionale di Geofisica, Roma, Italy ;Marchetti, M.; Istituto Nazionale di Geofisica, Roma, Italy; ; ; ; A scientific collaboration between the Istituto Nazionale di Geofisica (Italy) and the Warsaw Academy of Science (Poland) gave rise to the installation of a few stations for the long-term measurement of magnetotelluric fields in Central Italy. The investigation sites were determined following the individual seismic interest of each location. For this project, the magnetic observatory in L'Aquila was also equipped with electric lines, for simultaneous measurements of the telluric field. After a few years of experience some of the installed stations had to be removed for their high noise level that made this study almost impossible. A first time interval was considered from January 1992 to February 1993 and showed the existence of significant changes in magnetotelluric parameters related to earthquake occurrence time, an extension of that analysis was made to include the event of June 1993 using the magnetic field time variation.173 120 - PublicationOpen AccessGeneration of electric field in an earthquake preparation zone(1997-03)
; ;Teisseyre, R.; Institute of Geophysics, Polish Academy of Sciences, Warszawa, PolandDifferent attempts have been made to explain the generation of the electric currents before an earthquake that take place in an earthquake preparation zone; in some of them the coseismic effects are also included. In this paper we discuss the possibility to construct a model of displacement current generation in an earthquake source zone which combines polarization processes and motion of charged dislocations. Such a process is associated with the transition from isotropic to stress-induced anisotropic properties in an earthquake source zone. Concurrently, we consider the conduction currents related to a high velocity motion of charged dislocations. Another approach related to an electrokinetic model of current generation is also briefly discussed.186 280 - PublicationOpen AccessEvolution of magnetotelluric, total magnetic field, and VLF field parameters in Central Italy: relations to local seismic activity(2001-04)
; ; ; ; ; ; ;Meloni, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Di Mauro, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Mele, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Palangio, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Ernst, T.; Institute of Geophysics, Warszawa, Poland ;Teisseyre, R.; Institute of Geophysics, Warszawa, Poland; ; ; ; ; Magnetotelluric data were collected at Collemeluccio (41.72°N, 14.37°E) in Central Italy from summer 1991 to spring 1998. Analyzed by means of tensor decomposition on the geoelectric potential and robust estimation on the geomagnetic field, this set of data allowed the investigation of the electric properties at different time-periods. The variation of some indicators, related to the phenomenon of electromagnetic induction, is presented here in its time evolution and compared to local and regional seismic activity. Tectonomagnetic field observations from absolute magnetic field level in Central Italy were also made on data simultaneously recorded at four magnetometer stations, using L'Aquila Geomagnetic Observatory as a reference for differentiation. Recent results gathered from a system of two VLF search coil wide-band antennas, installed in the L'Aquila Observatory, are also discussed in relation to local seismic activity.255 417 - PublicationRestrictedObservations of Electromagnetic Radiation in the Central Apennines Seismic Region(2001)
; ; ; ; ; ;Ernst, T.; Institute of Geophysics, Polish Academy of Sciences, ul. Ksiecia Janusza 64, 01-452 Warszawa, Poland ;Jankowski, J.; Institute of Geophysics, Polish Academy of Sciences, ul. Ksiecia Janusza 64, 01-452 Warszawa, Poland ;Teisseyre, R.; Institute of Geophysics, Polish Academy of Sciences, ul. Ksiecia Janusza 64, 01-452 Warszawa, Poland ;Meloni, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Palangio, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; In recent years, continuous radio-noise recording is in use at many geophysical observatories, in order to detect possible earthquake precursors and/or coseismic signals. The recordings obtained indicate that electromagnetic radiation (e.g., in the range of 10-40 kH) can indeed be treated as seismic precursor. We present here the examples of successful prediction observation, which we have obtained in the Central Apennines region at the l'Aquila Observatory (Polish-Italian cooperation). A short discussion on relation between the evolution of stresses (dislocation dynamics) and electromagnetic emission supplements this paper.249 78