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Physical Review Research / American Physical Society

American Physical Society

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1(1).2019 –

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Publisher: American Physical Society

Electronic ISSN: 2643-1564

Topics: Physics

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Meetings / American Physical Society

American Physical Society

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1995 –

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Publisher: American Physical Society

Topics: Physics

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Magnitude-dependent epidemic-type aftershock sequences model for earthquakes (2020)

Spassiani, Ilaria ; Sebastiani, Giovanni

American Physical Society

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Publication Date: 2020-10-16

Description: We propose a version of the pure temporal epidemic type aftershock sequences (ETAS) model: the ETAS model with correlated magnitudes. As for the standard case, we assume the Gutenberg-Richter law to be the probability density for the magnitudes of the background events. Instead, the magnitude of the triggered shocks is assumed to be probabilistically dependent on that of the relative mother events. This probabilistic dependence is motivated by some recent works in the literature and by the results of a statistical analysis made on some seismic catalogs [Spassiani and Sebastiani, J. Geophys. Res. 121, 903 (2016)10.1002/2015JB012398]. On the basis of the experimental evidences obtained in the latter paper for the real catalogs, we theoretically derive the probability density function for the magnitudes of the triggered shocks proposed in Spassiani and Sebastiani and there used for the analysis of two simulated catalogs. To this aim, we impose a fundamental condition: averaging over all the magnitudes of the mother events, we must obtain again the Gutenberg-Richter law. This ensures the validity of this law at any event's generation when ignoring past seismicity. The ETAS model with correlated magnitudes is then theoretically analyzed here. In particular, we use the tool of the probability generating function and the Palm theory, in order to derive an approximation of the probability of zero events in a small time interval and to interpret the results in terms of the interevent time between consecutive shocks, the latter being a very useful random variable in the assessment of seismic hazard.

Description: Published

Description: 042134

Description: 6T. Studi di pericolosità sismica e da maremoto

Description: JCR Journal

Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)

Type: article

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Subsidence Detected by Multi-Pass Differential SAR Interferometry in the Cassino Plain (Central Italy): Joint Effect of Geological and Anthropogenic Factors? (2014)

Polcari, M. ; Albano, M. ; Saroli, M. ; [et al.]

Molecular Diversity Preservation International

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Publication Date: 2021-06-30

Description: In the present work, the Differential SAR Interferometry (DInSAR) technique has been applied to study the surface movements affecting the sedimentary basin of Cassino municipality. Two datasets of SAR images, provided by ERS 1-2 and Envisat missions, have been acquired from 1992 to 2010. Such datasets have been processed independently each other and with different techniques nevertheless providing compatible results. DInSAR data show a subsidence rate mostly located in the northeast side of the city, with a subsidence rate decreasing from about 5–6 mm/yr in the period 1992–2000 to about 1–2 mm/yr between 2004 and 2010, highlighting a progressive reduction of the phenomenon. Based on interferometric results and geological/geotechnical observations, the explanation of the detected movements allows to confirm the anthropogenic (surface effect due to building construction) and geological causes (thickness and characteristics of the compressible stratum)

Description: Published

Description: 9676-9690

Description: 6A. Monitoraggio ambientale, sicurezza e territorio

Description: JCR Journal

Description: open

Keywords: Differential SAR Interferometry; SBAS; IPTA; Cassino plain; subsidence ; 04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processes

Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)

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Analysis of self-organised criticality in the Olami-Feder-Christensen model and in real earthquakes (2007)

Caruso, F. ; Pluchino, A. ; Latora, V. ; [et al.]

American Physical Society

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Publication Date: 2017-04-04

Description: We perform an analysis on the dissipative Olami-Feder-Christensen model on a small world topology considering avalanche size differences. We show that when criticality appears, the probability density functions (PDFs) for the avalanche size differences at different times have fat tails with a q-Gaussian shape. This behavior does not depend on the time interval adopted and is found also when considering energy differences between real earthquakes. Such a result can be analytically understood if the sizes (released energies) of the avalanches (earthquakes) have no correlations. Our findings support the hypothesis that a self-organized criticality mechanism with long-range interactions is at the origin of seismic events and indicate that it is not possible to predict the magnitude of the next earthquake knowing those of the previous ones.

Description: Published

Description: 2.3. TTC - Laboratori di chimica e fisica delle rocce

Description: JCR Journal

Description: reserved

Keywords: SOC, earthquakes interaction ; 05. General::05.01. Computational geophysics::05.01.04. Statistical analysis

Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)

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