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  • 04.06. Seismology  (10)
  • C14
  • E52
  • J24
  • Lunar and Planetary Science and Exploration
  • 2020-2024  (10)
  • 1
    Publication Date: 2024-04-23
    Description: Nel mese di maggio 2022 è iniziato uno sciame sismico, di breve durata, che ha interessato una piccola area del Chianti fiorentino a circa 15 km a sud dalla città di Firenze. I due terremoti più energetici hanno avuto una magnitudo momento pari a 3.7; nonostante la magnitudo modesta, tali eventi sono stati avvertiti distintamente fino a distanze di diverse decine di chilometri, e hanno destato preoccupazione nella popolazione prossima all’area epicentrale. Inoltre, dato l’ingente patrimonio artistico presente nel capoluogo toscano, questo episodio ha sollevato interrogativi sulla sua vulnerabilità anche a scuotimenti del suolo di piccola entità. Al fine di migliorare le conoscenze sulla ubicazione e le dimensioni delle strutture sismogenetiche attive in prossimità di Firenze, l’Istituto Nazionale di Geofisica e Vulcanologia (INGV) è intervenuto nell’area interessata dallo sciame attraverso il Gruppo Operativo (GO) di emergenza SISMIKO. Il 4 maggio, giorno successivo all’inizio dello sciame, cinque stazioni sismiche mobili sono state installate a distanza ravvicinata dall’area epicentrale, e integrate nel sistema di monitoraggio permanente INGV. Questo lavoro descrive le procedure relative a: (i) l’installazione, la manutenzione e la disinstallazione della rete sismica mobile; (ii) la gestione e il controllo di qualità dei dati acquisiti. Infine, vengono presentate, in riferimento al contesto sismotettonico dell’area, le caratteristiche spaziali e l’evoluzione temporale dello sciame, che ha presentato una piccola ripresa nell’attività sismica ad agosto del 2022, con un terremoto di magnitudo locale 2.7 e successive repliche.
    Description: Published
    Description: 1-26
    Description: OST5 Verso un nuovo Monitoraggio
    Description: JCR Journal
    Keywords: Sciame sismico ; Reti sismiche di pronto intervento ; Chianti fiorentino ; Seismic swarm ; Rapid response seismic networks ; 04.06. Seismology ; 05.04. Instrumentation and techniques of general interest
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
    Publication Date: 2024-06-13
    Description: This study aims at developing new macroseismic intensity attenuation models valid for Italy by exploiting the most updated macroseismic dataset and earthquakes catalogue, as well as the information obtained from a critical analysis of the most recent models in the literature. Several different attenuation models have been calibrated as a function of the moment magnitude (Mw) and epicentral distance from 16,260 intensity data points, that are related to 119 earthquakes occurred after 1900. According to trends and residuals analysis, the preferred calibrated intensity attenuation function is a Log-Linear model for epicentral distance (Repi in km) and a linear model for Mw as: I(MCS) = 1.81 − 2.61LogR − 0.0039R + 1.42Mw with pseudo hypocentral distance R = √R2 + (9.87)2 ; the estimated standard deviation is epi σ=0.75. Also noteworthy is another model for macroseismic intensity attenuation that proved to be as good as the best model and shows higher sensitivity to physical parameters, such as focal depth and magnitude, especially in the epicentral area. Performance of all calibrated models was also checked on an independent set of 15 post-1900 Italian earth- quakes. One of the results of the present work is the opportunity to define earthquake sce- narios (e.g. probabilistic seismic hazard maps) in terms of Macroseismic Intensity and its related standard deviation, avoiding the uncertainties due to the conversion of various ground shaking parameters into intensity values.
    Description: Published
    Description: 795–843
    Description: OST2 Deformazione e Hazard sismico e da maremoto
    Description: JCR Journal
    Keywords: Macroseismic Intensity ; Intensity Attenuation ; Macroseismic Data ; Italy ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
    Publication Date: 2023-08-29
    Description: A methodology to detect local incompleteness of macroseismic intensity data at the local scale is presented. In particular, the probability that undocumented effects actually occurred at a site is determined by considering intensity prediction equations (in their probabilistic form) integrated by observations relative to known events documented at surrounding sites. The outcomes of this analysis can be used to investigate how representative and known the seismic histories of localities are (i.e., the list of documented effects through time). The proposed approach is applied to the Italian area. The analysis shows that, at most of the considered sites, the effects of intensity ≥ 6 should most probably have occurred at least once, but they are not contained in the current version of the Italian macroseismic databases. In a few cases, instead, the lack of data may concern higher intensity levels (i.e., ≥ 8). The geographical distribution of potentially lost information reflects the heterogeneity of the seismic activity over the Italian territory.
    Description: Published
    Description: 1805–1816
    Description: 4T. Sismicità dell'Italia
    Description: JCR Journal
    Keywords: Macroseismology ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
    Publication Date: 2023-10-26
    Description: In active volcanic zones, fault dynamics is considerably fast but it is often difficult to separate the pattern of nearly continuous large-scale volcanic processes (inflation/deflation processes, flank instability) from impulsive episodes such as dyke intrusions or coseismic fault displacements. At Etna, multidisciplinary studies on active faults whose activity does not strictly depend on volcanic processes, are relatively few. Here we present the case-study of the San Leonardello fault, an active structure located in the eastern flank of Mt. Etna characterised by a well-known seismic history. This fault saw renewed activity in May 2009, when pre-seismic creeping along the southern segment preceded an MW 4.0 earthquake in the northern segment, followed by some twenty-five aftershocks. Later, in March–April 2016, creep events reactivated the southern section of the same fault. Both the seismic and aseismic phenomena were recorded by the seismic and GNSS networks of INGV-Osservatorio Etneo, and produced surface faulting that left a footprint in the pattern of ground deformation detected by the InSAR measurements. We demonstrate that the integration of multidisciplinary data collected for volcano surveillance may shed light on different aspects of fault dynamics, and allow understanding how coseismic slip and creep alternate in space and time along the strike. Moreover, we use findings from our independent datasets to propose a conceptual model of the San Leonardello fault, taking into account behaviour and previous constraints from fault-based seismic hazard analyses. Although the faulting mechanisms described here occur at a very small scale compared with those of a purely tectonic setting, this case-study may represent a perfect natural lab for improving knowledge of seismogenic processes, also in other fault zones characterised by stick slip vs. stablesliding fault behaviour.
    Description: Published
    Description: 228554
    Description: 2T. Deformazione crostale attiva
    Description: JCR Journal
    Keywords: Fault ; Earthquake ; Creep ; Seismotectonics ; Behaviour ; Mt. Etna volcano ; 04.07. Tectonophysics ; 04.06. Seismology ; 04.03. Geodesy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
    Publication Date: 2023-07-20
    Description: SISMIKO is the operational task force at the Istituto Nazionale di Geofisica e Vulcanologia aiming at the rapid deployment of temporary seismic stations in the area hit by a significant earthquake or a seismic sequence causing concern and interest with impact on people. Decreasing the average distance between the seismic stations improves network detection, accuracy of the earthquake locations, shakemaps and strong motion parameters. The data acquired by SISMIKO are available, without any constraints, to the entire scientific community through the EIDA portal Italy node, which assures a high level of data quality. A national diffusion of the preconfigured seismic stations in different headquarters and a ready acquisition system, guarantee rapid response after an earthquake and allow the immediate acquisition of the data as soon as each seismic station is installed. An international FDSN network code is registered in advance and a five char codification for the station names is applied to request the ISC station codes (T〈emergency identifier〉〈headquarter identifier〉). The last emergency (no. 17) in 2022 was caused by an earthquake of Mw 5.5 in the Costa Marchigiana region, where we installed eight stations of the Y1 network the same day as the mainshock (DOI: 10.13127/SD/TBLKBA-3U6). We present the organization and the objectives of the SISMIKO operational group and the analysis of the dataset of the latest seismic sequence carried out by the seismic surveillance service, the Italian Seismic Bulletin (BSI) and SISMIKO.
    Description: Published
    Description: Berlin
    Description: 8T. Sismologia in tempo reale e Early Warning Sismico e da Tsunami
    Description: 1SR TERREMOTI - Sorveglianza Sismica e Allerta Tsunami
    Description: 2SR TERREMOTI - Gestione delle emergenze sismiche e da maremoto
    Description: 1IT. Reti di monitoraggio e sorveglianza
    Keywords: SISMIKO ; Reti sismiche di pronto intervento ; Temporary seismic network ; Realtime seismology ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 6
    Publication Date: 2023-02-20
    Description: This report describes the state of the art of the installation techniques for seismic stations developed by the Seismology Group and the Seismology Laboratory at the INGV branch in Pisa, with examples of applications taken from long‐duration field experiments carried out in different areas of Tuscany, such as Monte Amiata and the Mugello basin. Our goal was to develop a low‐cost infrastructure, portable and easily adaptable to different terrains, suitable for hosting a variety of real‐time seismic stations. In addition to improving the structural resistance of the deployment, we also developed applications for the remote monitoring of the state of health of the seismic stations, which allowed a more efficient maintenance of the instrumentation. The proposed type of installation has proved to be sufficiently robust and suitable for installations with a temporal duration of a few years, and in agreement with the expected targets, as proved by the analyses carried out during and at the end of the experiments in which they were used.
    Description: Published
    Description: 1-30
    Description: 1IT. Reti di monitoraggio e sorveglianza
    Description: N/A or not JCR
    Keywords: Stazioni sismiche, Installazione sensori sismici, Rete temporanea, Seismic stations, Seismic sensor installation, Temporary network ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 7
    Publication Date: 2023-05-04
    Description: Third-generation gravitational wave observatories will extend the lower frequency limit of the observation band toward 2 Hz, where new sources of gravitational waves, in particular intermediate-mass black holes (IMBH), will be detected. In this frequency region, seismic noise will play an important role, mainly through the so-called Newtonian noise, i.e., the gravity-mediated coupling between ground motion and test mass displacements. The signal lifetime of such sources in the detector is of the order of tens of seconds. In order to determine whether a candidate site to host the Einstein Telescope observatory is particularly suitable to observe such sources, it is necessary to estimate the probability distributions that, in the characteristic time scale of the signal, the sensitivity of the detector is not perturbed by Newtonian noise. In this paper, a first analysis is presented, focused on the Sos Enattos site (Sardinia, Italy), a candidate to host the Einstein Telescope. Starting from a long data set of seismic noise, this distribution is evaluated considering both the presently designed triangular ET configuration and also the classical ”L” configuration.
    Description: Published
    Description: 511
    Description: 2IT. Laboratori analitici e sperimentali
    Description: JCR Journal
    Keywords: gravitation waves ; site characterization ; Einstein Telescope ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 8
    Publication Date: 2023-05-25
    Description: © The Author(s) 2023. Published by Oxford University Press on behalf of The Royal Astronomical Society.
    Description: Einstein Telescope (ET) is a proposed underground infrastructure in Europe to host future generations of gravitational-wave (GW) detectors. One of its design goals is to extend the observation band of terrestrial GW detectors from currently about 20 Hz down to 3 Hz. The coupling of a detector to its environment becomes stronger at lower frequencies, which makes it important to carefully analyze environmental disturbances at ET candidate sites. Seismic disturbances pose the greatest challenge since there are several important mechanisms for seismic vibrations to produce noise in ET, e.g., through gravitational coupling, stray light, or through harmful constraints on the design of ET’s control system. In this paper, we present an analysis of the time-variant properties of the seismic field at the Sardinia candidate site of ET connected to anthropogenic as well as natural phenomena. We find that temporal variations of source distributions and of the noise spectra generally follow predictable trends in the form of diurnal, weekly, or seasonal cycles. Specific seismic sources were identified such as road bridges, which produce observable disturbances underground. This information can be used to adapt a detector’s seismic isolation and control system.
    Description: Published
    Description: 1943–1964
    Description: 1T. Struttura della Terra
    Description: JCR Journal
    Keywords: Einstein Telescope ; Seismic noise ; Gravitational waves ; Time series analysis ; Seismic instruments ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
    Publication Date: 2023-10-24
    Description: Improving the knowledge of the seismic history of a region plays a key role in the evaluation of recurrence relations for probabilistic seismic hazard analyses. In this study we present the results of an investigation carried out in two local historical archives in NE Sicily, Italy. Several letters, petitions, and reports describing the effects of some earthquakes that occurred between the 17th and the 18th centuries in the Gulf of Patti area were found and analyzed. This contributed to filling the knowledge gap about a series of moderate-to-large seismic events that were overshadowed by catastrophic earthquakes with major impact both on human losses and cultural heritage damages. We describe this experience in the hope that other historians will take up the work, looking for other NE Sicily local archives to investigate because we believe this is the right way toward a better definition of the seismic history of one of the most seismically active regions of Italy.
    Description: INGV Sezione di Milano
    Description: Published
    Description: 1011–1025
    Description: 4T. Sismicità dell'Italia
    Description: JCR Journal
    Keywords: North Eastern Sicily ; Historical earthquakes ; Gulf of Patti ; Patti ; Patti historical archives ; Historical seismology ; Historical research ; Seismic risk ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 10
    Publication Date: 2024-02-22
    Description: SISMIKO is the operational group within the Istituto Nazionale di Geofisica e Vulcanologia responsible for deploying a temporary seismic network as a rapid response to significant seismic events [Moretti et al., 2023; https://sismiko.ingv.it/]. The purpose of the temporary seismic network is to complement the RSNi (Rete Sismica Nazionale integrata) by reducing the inter-station distances of permanent stations, where necessary. SISMIKO has a distributed structure across various INGV headquarters nationwide and in recent years has equipped itself with a consistent set of around 50 seismo-accelerometric stations and an autonomous acquisition system. This system makes the acquired data available, without restrictions, to the entire scientific community through the Italy node of the European Integrated Data Archive (EIDA [Danecek et al., 2021]) portal, ensuring a high level of data quality. To ensure a rapid response following an earthquake and rapid integration of data collected by emergency stations, a codified procedure has been established. Through this procedure, the metadata of each station is pre-configured and the data flow coming from these stations is collected within an acquisition system [D'Alema et al., 2022]. This setting allows the rapid use, if necessary, of the data obtained by SISMIKO - after a quality control - by the seismologists on duty at the INGV Operations Room [Margheriti et al., 2021]. Today, over 100 INGV personnel join SISMIKO group: technicians, technologists and researchers from each of the headquarters distributed across the national territory. A new configuration in Activity Groups allows to coordinate the distributed personnel and to cover all the aspects in the preparation of the emergency such as the technical management of the instrumentation, the field operations, to maintain contacts with the INGV Crisis Unit and the other Operational Groups and to develop automatic procedures to analyse real time seismic data (Fig 1). Besides the operational aspects, in recent years SISMIKO has promoted the recovery of continuous data recorded by temporary seismic stations installed during past seismic sequences such as in L'Aquila 2009, Po Plain 2012 and Central Italy 2016. By reconstructing the complete station's metadata, it is now possible to distribute the data to the scientific community through the EIDA portal.
    Description: Unpublished
    Description: Ferrara
    Description: OST5 Verso un nuovo Monitoraggio
    Keywords: SISMIKO ; Emergency Group ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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