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  • 1
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    Revised Accelerated Moment Release Under Test: Fourteen Worldwide Real Case Studies in 2014–2018 and Simulations (2021)
    Springer
    Details
    Publication Date: 2021-01-29
    Description: eriods of accelerated seismicity have been observed during the preparation process of many large earthquakes. This accelerating seismicity can be detected by the Accelerated Moment Release (AMR) method and its recent Revised version (RAMR) when the two techniques are applied to earthquake catalogues. The main aim of this study is to investigate the seismicity preceding large mainshocks and possibly increase our comprehension of the underlying physics. In particular, we applied both the AMR and R-AMR to the seismicity preceding 14 large worldwide shallow earthquakes, i.e. with focal depth less than 40 km, with magnitude M[6 for Mediterranean area, and M C 6.4 in the rest of the world, occurred from 2014 to 2018. Twelve case studies were analysed in the framework of SwArm For Earthquake study project funded by ESA, comprising the period 2014–2016; two additional cases were also considered to confirm the goodness of the methodology outside the period of the project catalogues. In total, R-AMR shows better performances than AMR, in 11 cases out of 14. In particular, in four out of 14 cases (i.e. 28.6%), the R-AMR method shows that acceleration exists due to an evident clustering in time–space on the faults, thus guiding the convergence of the fit; in seven cases (i.e. 50%) the R-AMR discloses acceleration, although no clustering around the fault is present; the remaining three cases (i.e. 21.4%) show no emerging acceleration from background. Finally, when R-AMR is compared with simulations, we verify that in most of the cases the acceleration is real and not casual.
    Description: Published
    Description: 4057–4087
    Description: 7T. Variazioni delle caratteristiche crostali e precursori sismici
    Description: JCR Journal
    Keywords: earthquake ; precursory acceleration ; accelerated moment release ; time to failure ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Climatology of GPS scintillations over Antarctica under solar minimum conditions (2010)
    Details
    Publication Date: 2017-04-04
    Description: We analyse GNSS ionospheric scintillation data recorded in Antarctica to investigate the conditions of the near- Earth environment leading to scintillation scenarios, producing a “scintillation climatology” over a large geomagnetic quiet period.Within this scope we realize maps of scintillation occurrence as a function of the magnetic local time (MLT) and of the altitude adjusted corrected geomagnetic coordinates (AACGM). The maps are realized merging observations of two GISTMs (GPS Ionospheric Scintillation and TEC Monitor) located at Mario Zucchelli Station (74.7°S, 164.1°E) and Concordia Station (75.1°S, 123.2°E) in Antarctica during 2008. The results highlight the possibility to investigate the impact of ionospheric irregularities on the phase and amplitude of GNSS signals, evidencing the cusp/cap and auroral contributions. This works aims to contribute to the development of nowcasting and forecasting tools for GNSS ionospheric scintillation.
    Description: Unpublished
    Description: Vienna - Austria
    Description: 3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale
    Description: open
    Keywords: Ionosphere (Ionospheric irregularities) ; GNSS Scintillation climatology ; TEC gradients ; Ionospheric disturbances, irregularities, and storms ; 01. Atmosphere::01.02. Ionosphere::01.02.07. Scintillations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 3
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    Climatology of GPS ionospheric scintillation over North European high and mid-latitudes under different solar activity conditions (2010)
    Details
    Publication Date: 2017-04-04
    Description: Under perturbed conditions caused by intense solar wind-magnetosphere coupling, the ionosphere may become highly turbulent and irregularities, typically enhancements or depletions of the electron density embedded in the ambient ionosphere, can form causing diffraction effects on the satellites signals passing through them. Such effects can cause GPS navigation errors and outages, abruptly jeopardizing its performance. Due to the morphology of the geomagnetic field, whose lines are almost vertical at high latitude, polar areas are characterized by the presence of significant ionospheric irregularities. The understanding and consequent mitigation of the effect of the scintillation phenomena is important, not only in preparation for the next solar cycle, whose maximum is expected in 2013, but also for a deeper comprehension of the dynamics of the high-latitude ionosphere. We analyze data of ionospheric scintillation over North European regions under different geomagnetic condition, to characterize the GPS scintillation phenomena under different forcing conditions of the near-Earth environment and to develop a “scintillation climatology” of the high and mid latitude ionosphere. The scintillation occurrence as a function of the magnetic local time and of the altitude adjusted corrected magnetic latitude is analysed, together with the Total Electron Content (TEC) information, to put in evidence the link between electron density gradients and ionospheric irregularities causing scintillation. The results shown herein are obtained merging observations from a network of GISTMs (GPS Ionospheric Scintillation and TEC Monitor) located over a wide range of latitudes in the Northern hemisphere. Findings confirm the associations of the occurrence of the ionospheric irregularities with the position of the auroral oval and of the ionospheric trough walls and show the contribution of the polar cap patches even under solar minimum conditions. This work could contribute to the development of forecasting tools for GPS ionospheric scintillation prediction.
    Description: Unpublished
    Description: Oslo - Norway
    Description: 3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale
    Description: open
    Keywords: Physics of the ionosphere ; Scintillation climatology ; Ionospheric irregularties ; TEC gradients ; 01. Atmosphere::01.02. Ionosphere::01.02.07. Scintillations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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  • 4
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    GPS scintillations over Vietnam on April 2006 (2010)
    Details
    Publication Date: 2017-04-04
    Description: In Vietnam, at Hue (16.4°N, 107.6°E) and Hoc Mon (10.9°N, 106.6°E), are located two GPS receivers specially modified for recording, at a sampling rate of 50 Hz, the phase and the amplitude of the L1 signal and the Total Electron Content (TEC) from L1 and L2. In April 2006 both the receivers have observed post-sunset scintillation inhibition when moderate magnetic storms occurred. These measurements together with a 3D plus time imaging of the ionosphere produced by the Multi-Instrument Data Analysis System (MIDAS) have revealed interesting features that will be described in the present paper. In particular, the results confirm the role of the ring current on the generation of the equatorial F layer irregularities of scale size from less than a hundred meters to a few kilometers, highlighting also its important role in inhibiting scintillation during the storm. The characterization of the different conditions of the Interplanetary Magnetic Field (IMF) will be illustrated, as well, to attempt a description of the scintillation effects over a region scarcely investigated in the open literature.
    Description: Unpublished
    Description: Vienna - Austria
    Description: 3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale
    Description: open
    Keywords: Low latitude ionosphere ; Multi-instruments approach ; GNSS scintillations ; TEC gradients ; 01. Atmosphere::01.02. Ionosphere::01.02.07. Scintillations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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  • 5
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    Scintillation events over Vietnam on April 2006 (2010)
    Details
    Publication Date: 2017-04-04
    Description: In Vietnam, at Hue (16.4°N, 107.6°E) and Hoc Mon (10.9°N, 106.6°E), are located two GPS receivers specially modified for recording, at a sampling rate of 50 Hz, the phase and the amplitude of the L1 signal and the Total Electron Content (TEC) from L1 and L2. In April 2006 both the receivers have observed post-sunset scintillation inhibition when moderate magnetic storms occurred. These measurements together with a 3D plus time imaging of the ionosphere produced by the Multi-Instrument Data Analysis System (MIDAS) have revealed interesting features that will be described in the present paper. MIDAS allows the characterization of the TEC condition over the interested area supporting the speculation on the causes resulting on scintillating GPS signals received at ground. The results confirm the role of the ring current on the generation of the equatorial F layer small-scale irregularities, in relationship with the observed inhibition of scintillations during the storms. The case studies will be discussed also by looking at the different conditions of the Interplanetary Magnetic Field (IMF), to attempt a description of the scintillation effects over a region scarcely investigated in the open literature.
    Description: Unpublished
    Description: Barcelona - Spain
    Description: 3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale
    Description: open
    Keywords: Low latitude ionosphere ; GNSS scintillations ; TEC gradients ; Multi-instruments approach ; 01. Atmosphere::01.02. Ionosphere::01.02.07. Scintillations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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  • 6
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    Statistical correlation analysis of strong earthquakes and ionospheric electron density anomalies as observed by CSES-01 (2021)
    SOCIETÀ ITALIANA DI FISICA
    Details
    Publication Date: 2021-10-28
    Description: In this work, we preliminary analyse ionospheric electron density as observed by the first China Seismo-Electromagnetic Satellite (CSES-01) from April 2018 to July 2019, defining an anomaly along each track objectively. We then apply a worldwide statistical correlation in space and time of these anomalies with respect to M5.5+ shallow earthquakes (USGS source) occurred in the same period. Although the data are short and cover discontinuously the period of concern, in general, the preliminary results seem to confirm those obtained with an analogous analysis on the Swarm satellite data recently published in De Santis A. et al., Sci. Rep., 9, (2019) 20287.
    Description: This work has been performed in the framework of four different projects: LIMADOUScienza, funded by the Italian Space Agency, Further, funded by INGV, Working Earth (Pianeta Dinamico CUP: D53J19000170001), funded by the Italian MUR ministry and Dragon 5 cooperation 2020–2024 project (ID.59236).
    Description: Published
    Description: 119
    Description: 7T. Variazioni delle caratteristiche crostali e "precursori"
    Description: JCR Journal
    Keywords: CSES ; earthquake ; electron density ; ionosphere ; precursors ; 01.02. Ionosphere ; 04.05. Geomagnetism
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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