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Makris, J. P.
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- PublicationOpen AccessCampi Flegrei active seismic experiments waveforms compilation(2006)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Capuano, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italia ;Zollo, A.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;Auger, E.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;Caielli, G.; Istituto per la Dinamica dei Processi Ambientali, CNR, Milano, Italy ;Chiarabba, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Convertito, V.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;D’Auria, L.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;De Franco, R.; Istituto per la Dinamica dei Processi Ambientali, CNR, Milano, Italy ;Emolo, A.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;Judenherc, S.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;Lovisa, L.; Istituto Nazionale di Oceanografia e Geofisica Sperimentale, Trieste, Italy ;Makris, J.; University of Hamburg, Hamburg, Germany ;Michelini, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Moretti, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Priolo, E.; Istituto Nazionale di Oceanografia e Geofisica Sperimentale, Trieste, Italy ;Russo, G.; Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy ;Virieux, J.; Géosciences Azur, CNRS, Université de Nice, Sophie Antinopolies, Valbonne, France; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; A new experiment called SERAPIS (SEismic Reflection/Refraction Acquisition Project for Imaging complex volcanic Structures) has been planned and carried out, based on off-shore seismic energization and data acquisition on land and on sea-bottom. The experiment was performed in September, 2001 during which the vessel NADIR of IFREMER (equipped with 12, 16-liters airgun) produced more than 5000 air gun shots recorded at a sea-bottom seismograph array of 72 OBS and 62 stations installed on-land. Active seismic refraction DSS (Deep Seismic Soundings) acquired during the surveys conducted in 1980 and 1985 were recovered jointly with seismic data acquired in the Campi Flegrei area in the framework of the MareVes97 (an experiment devoted to the definition of the structure of the Somma-Vesuvio complex) offshore survey. The data set acquired during the SERAPIS experiment has been successfully used to infer 3D images of the volcanic structures of Campi Flegrei and Neapolitan bay. Active seismic waveforms and related P-picks (more than 90000 data) from the SERAPIS experiment are also available in the project data server.359 277 - PublicationOpen AccessTesting the IONORT-ISP system: A comparison between synthesized and measured oblique ionograms(2013-05-03)
; ; ; ; ; ; ; ;Settimi, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Pezzopane, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Pietrella, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Bianchi, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Scotto, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Zuccheretti, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Makris, J.; Technological Educational Institute of Crete, P.O. Box 1939 Chania, Crete, Greece; ; ; ; ; ; The three-dimensional (3-D) electron density representation of the ionosphere computed by the assimilative IRI-SIRMUP-P (ISP) model was tested using IONORT (IONOspheric Ray-Tracing), a software application for calculating a 3-D ray-tracing for high frequency (HF) waves in the ionospheric medium. A radio link was established between Rome (41.8°N, 12.5°E) in Italy, and Chania (35.7°N, 24.0°E) in Greece, within the ISP validity area, and for which oblique soundings are conducted. The ionospheric reference stations, from which the autoscaled foF2 and M(3000)F2 data and real-time vertical electron density profiles were assimilated by the ISP model, were Rome (41.8°N, 12.5°E) and Gibilmanna (37.9°N, 14.0°E) in Italy, and Athens (38.0°N, 23.5°E) in Greece. IONORT was used, in conjunction with the ISP and the International Reference Ionosphere (IRI) 3-D electron density grids, to synthesize oblique ionograms. The comparison between synthesized and measured oblique ionograms, both in terms of the ionogram shape and the maximum usable frequency characterizing the radio path, demonstrates both that the ISP model can more accurately represent real conditions in the ionosphere than the IRI, and that the ray-tracing results computed by IONORT are reasonably reliable.20487 511 - PublicationRestrictedInnovative Seismoeletromagnetic Research at the front of the Hellenic Arc(Copernicus Meetings, 2013-04-07)
; ; ; ; ; ; ; ; ; ; ;Makris, J. P.; Dept. of Electronics, Technological Educational Institute of Crete, Chania, Greece ;Chiappini, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Nardi, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Carluccio, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Rigakis, H.; Dept. of Electronics, Technological Educational Institute of Crete, Chania, Greece ;Hloupis, G.; Dept. of Electronics, Technological Educational Institute of Athens, Athens, Greece ;Fragkiadakis, K.; Dept. of Electronics, Technological Educational Institute of Crete, Chania, Greece ;Pentaris, F.; Dept. of Electronics, Technological Educational Institute of Crete, Chania, Greece ;Saltas, V.; Dept. of Natural Resources & Environment, Technological Educational Institute of Crete, Chania, Greece ;Vallianatos, F.; Dept. of Natural Resources & Environment, Technological Educational Institute of Crete, Chania, Greece; ; ; ; ; ; ; ; ; Taking into account the complex nature and rarity of strong seismic events, as well as the form multiplicity and timing variety of possible preseismic signatures, the predominant view of the scientific community still seems nowadays to lean against earthquake prediction, especially the short-term one. On the other hand, seismoelectromagnetic (SEM) research appears to be a promising approach to earthquake prediction research. In this context, the project TeCH-SEM [Technologies Coalescence for Holistic Seismoelectromagnetic Research (Lithosphere-Atmosphere-Ionosphere Coupling)] aims to establish an integrated approach to SEM investigation, by developing and implementing novel-innovative technologies for the study of pre-seismic electric, magnetic and electromagnetic signatures in a broadband spectrum (ULF-ELF-VLF-LF-HF). In this framework, at the natural laboratory of the seismically active south- and south-western part of the Hellenic Arc (broader region of Crete) is being developed a permanent network of ULF-ELF seismoelectromagnetic stations featuring novel design that provides real-time telemetry, extended autonomy, light-weight and small-size but robust and powerful datalogging and self-diagnostics for reliable, long-term operation. This network is complemented by the simultaneous deployment of an innovative ELF-VLF seismoelectromagnetic telemetric network that will attempt to detect, in real conditions, VLF electromagnetic transients that have been repeatedly observed in the laboratory to be emitted from rock samples with various lithologies subjected to fracture under uniaxial compression. Both networks, it is anticipated to remain in operation for many years.241 37 - PublicationOpen AccessMT-data analysis from a survey in the Mygdonia basin (N. Greece)(2002)
; ; ; ;Makris, J. P.; Department of Electronics, Technological Educational Institute of Crete, Chalepa, Chania, Crete Island, Greece ;Savvaidis, A. S.; Laboratory of Geophysics, Department of Geology, Aristotle University of Thessaloniki, Greece ;Vallianatos, F.; Department of Electronics, Technological Educational Institute of Crete, Chalepa, Chania, Crete Island, Greece; ; A magnetotelluric (MT) profile comprising eight measuring sites was conducted in the Mygdonia basin, a European Seismological Test Site. The MT-stations were deployed in a direction almost perpendicular to the major axis of the sedimentary basin to cover the area between the Lagada and Volvi lakes. The earth beneath the measuring points was considered to consist of a 2D-regional basement coupled with local, near surface, 3D-inhomogeneities. Impedance tensor decomposition analysis in conjunction with the magnetotelluric study of Mohr circles was implemented in the MT-data. From the electric field polarization diagrams and the interpretation of the Mohr circles results it is inferred that the local structure at all the sites polarizes the electric field in comparable directions ranging from N60°E to N80°E, except for the cases of the two stations located at the northern and southern borders of the basin, where the boundary conditions produce a deviation. Furthermore, the deeper structure seems to be two-dimensional. The strike-direction of the 2D-basement was found to be ~ N70°E. Although the regional geological strike in the area is NW-SE, the regional geoelectric strike is more compatible with the orientation of the faults in the area.210 200 - PublicationOpen AccessProperties of the geoelectric structure that promote the detectionof electrotelluric anomalies: the case of Ioannina, Greece(2001-04)
; ;Makris, J. P.; Technological Educational Institute of Crete, Department of Electronics (Branch of Chania), Chalepa, Chania, Crete Island, GreeceThe reliable detection and identification of electrotelluric anomalies that could be considered as precursory phenomena of earthquakes become fundamental aspects of earthquake prediction research. Special arrangements, in local and/or regional scale, of the geoelectric structure beneath the measuring point, may act as natural real-time "filters" on the ULF electrotelluric data improving considerably the signal to "magnetotelluric-noise" ratio of anomalies originated by probably non-magnetotelluric sources. Linear polarization, i.e. local channelling of the electric field on the surface is expected in cases where 3D-local inhomogeneities, producing strong shear distortion, are present in the vicinity of the monitoring site and/or when a 2D-regional geoelectrical setting exhibits high anisotropy. By assuming different generation mechanisms and modes of propagation for the electrotelluric anomalies that could be considered earthquake precursory phenomena, a rotationally originated residual electrotelluric field results, eliminating background magnetotelluric-noise and revealing "hidden" transient variations that could be associated to earthquakes. The suggested method is applicable in real-time data collection, thus simplifies and accelerates the tedious task of identification of suspicious signals. As an indicative example, the case of Ioannina (located in Northwestern Greece) is presented. The local polarization of the electrotelluric field varies dramatically even at neighboring points although the regional geoelectric strike direction does not change.+157 401 - PublicationRestrictedA new campaign for oblique-incidence ionospheric sounding over Europe and its data application(2008)
; ; ; ; ; ; ; ; ; ; ; ; ;Zolesi, B.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Fontana, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Perrone, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Pietrella, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Romano, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Tutone, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Belehaki, A.; National Observatory of Athens, Institute for Space Applications and Remote Sensing, Greece ;Tsagouri, I.; National Observatory of Athens, Institute for Space Applications and Remote Sensing, Greece ;Kouris, S. S.; Aristotle University of Thessaloniki, Greece ;Vallianatos, F.; Technological Educational Institute of Crete, Greece ;Makris, J. P.; Technological Educational Institute of Crete, Greece ;Angling, M. J.; Centre for RF Propagation and Atmospheric Research, QinetiQ, UK; ; ; ; ; ; ; ; ; ; ; New systematic oblique ionospheric radio sounding measurements over Central Europe, concerning the radio links between Inskip (UK, 53.51N, 2.51W) and Rome (Italy, 41.81N, 12.51E) and between Inskip and Chania (Greece, 35.71N, 24.01E), have been performed since November 2003. Different long-term (i.e. monthly median) ionospheric predictions and nowcasting techniques have been applied and compared with the oblique-incidence radio sounding measurements. The MUF (basic maximum usable frequency) measurements observed during the early part of the experiment have been used to compare the performances of different methods. The preliminary analysis has shown good performances for the long-term prediction models, in particular in winter months for ICEPAC (ionospheric communications enhanced profile analysis and circuit) and in equinox/summer months for ASAPS (advanced stand-alone prediction system) and SIRM&LKW (simplified ionospheric regional model & lockwood). The nowcasting methods SIRMUP&LKW (SIRM updating method & lockwood) and ISWIRM (instantaneous space weighted ionospheric regional model) reveal good results for moderate and disturbed geomagnetic conditions when compared with the long-term prediction methods.423 33 - PublicationRestrictedOblique-incidence ionospheric soundings over Central Europe and their application for testing now casting and long term prediction models(2009-06-02)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Pietrella, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Perrone, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Fontana, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Romano, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Malagnini, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Tutone, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Zolesi, B.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Cander, Lj. R.; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, UK ;Belehaki, A.; National Observatory, Institute for Space Applications and Remote Sensing, 15236 P. Penteli, Athens, Greece ;Tsagouri, I.; National Observatory, Institute for Space Applications and Remote Sensing, 15236 P. Penteli, Athens, Greece ;Kouris, S. S.; Department of Electrical and Computer Engineering, Aristotelian University of Thessaloniki, Thessaloniki, Greece ;Vallianatos, F.; Technological Educational Institute of Crete, P.O. Box 1939 Chania, Crete, Greece ;Makris, J.; Technological Educational Institute of Crete, P.O. Box 1939 Chania, Crete, Greece ;Angling, M.; Centre for RF Propagation and Atmospheric Research, QinetiQ, Malvern Worcestershire WR14 3PS, UK; ; ; ; ; ; ; ; ; ; ; ; ; After a first oblique-incidence ionospheric sounding campaign over Central Europe performed during the period 2003–2004 over the radio links between Inskip (UK, 53.5°N, 2.5°W) and Rome (Italy, 41.8°N, 12.5°E) and between Inskip and Chania (Crete, 35.7°N, 24.0°E), new and more extensive analysis of systematic MUF measurements from January 2005 to December 2006 have been performed. MUF measurements collected during moderately disturbed days (17 ≤ Ap ≤ 32), disturbed days (32 < Ap ≤ 50) and very disturbed days (Ap > 50), have been used to test the long term prediction models (ASAPS, ICEPAC and SIRM&LKW), and the now casting models (SIRMUP&LKW and ISWIRM&LKW). The performances of the different prediction methods in terms of r.m.s are shown for selected range of geomagnetic activity and for each season.635 36