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  • 1
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    The Seismicity of Ischia Island (2019)
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    Publication Date: 2021-03-09
    Description: Ischia is a volcanic island, west of the caldera of Campi Flegrei, southern Italy. Since the deployment of a modern seismic network in 1970, until the 21 August 2017 earthquake, the seismicity of Ischia has been characterized by low-magnitude (Md ≤ 2:3) earthquakes located in the northern part of the island, mostly beneath the town of Casamicciola Terme at very shallow depths (∼500 m). Some of these events seem to have occurred on the same seismogenetic structure in the northern part of the island. This area coincides with that where the devastating events of 1881 and 1883 occurred and where the small-magnitude seismicity recorded between 1927 and 1936 was located. The August 2017 seismic sequence affected the same area. The current network configuration is able to locate shallow events with Md ≥ 1:0 and to detect smaller earthquakes or other types of natural and artificial events (e.g., blast fishing, geothermal well explosions; see The Seismic Network section). Here, we present the catalog of earthquakes recorded on Ischia between 1999 and February 2018 and compare the August 2017 seismic sequence with the background seismicity. Furthermore, we identified a sequence of events possibly linked to the explosion of a geothermal well on the island.
    Description: This work benefited of the project “Sale operative integrate e reti di monitoraggio del futuro: l’INGV 2.0,” Fondo integrativo speciale per la ricerca (FISR) anni 2016 e 2017 (Delibera n. 78/2017). Furthermore, this work benefited of the agreement between Istituto Nazionale di Geofisica e Vulcanologia and Italian Department of Civil Protection (DPC).
    Description: Published
    Description: 1750-1760
    Description: 6V. Pericolosità vulcanica e contributi alla stima del rischio
    Description: JCR Journal
    Keywords: Ischia ; Seismic Network ; Seismicity
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Le attività del gruppo operativo SISMIKO in occasione del terremoto di Ischia Mw3.9 (MD4.0) del 21 Agosto 2017 (2019)
    Details
    Publication Date: 2020-03-24
    Description: After the MD 4.0 (Mw 3.9) earthquake of August 21 2017 which occurred on the Ischia island, the SISMIKO group [Moretti et al., 2016a; 2016b], which is the coordinating group of the emergency seismic networks of INGV, was activated and four seismic mobile stations were installed in the district of Casamicciola and Lacco Ameno integrated with the permanent network on the island. At the beginning, for the first three months, all the mobile stations, coded as T13 network, acquired locally and were equipped with short period sensors and one accelerometer. Starting from October 2017, the seismic signals for three of the four stations, in separate times from October 2017 to May 2018, were transmitted in real time to the INGV monitoring acquisition room for surveillance purposes. Nowadays, the mobile seismic network on the island is composed by six stations: three of them are telemetered while the others recorded signals on local disks. The seismic stations were equipped with short period sensors LE3Dlite 1Hz, LE3D 5s and FBA-EST Kinemetrics accelerometers. Although starting from September 2017, the seismicity of Ischia island was characterized by few low magnitude earthquakes, the installation of mobile stations T13 improved the performance of the seismic network either for the localization analysis or for the detection of very low magnitude earthquakes.
    Description: Published
    Description: 1-28
    Description: 1IT. Reti di monitoraggio e sorveglianza
    Description: JCR Journal
    Keywords: Seismic Network ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    The real-time multiparametric network of Ischia (2019)
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    Publication Date: 2019-10-18
    Description: Ischia is an active volcanic complex, which erupted the last time in 1302. Its recent geological history is dominated by the earthquake of 1883, which seriously affected Casamicciola Terme, and the other municipalities of the island. On 21st Agust 2017, the Md=4.0 earthquake located below the town of Casamicciola Terme addressed the media attention to this volcanic island that was seismically monitored since 1885 by Giulio Grablovitz (1846-1928) who installed a seismic tank (an instrument capable of measuring and recording on paper the oscillations of the water contained in a tank, with respect to the ground) in the Casamicciola Observatory. The Osservatorio Vesuviano is the INGV division charged of the Ischia monitoring. The first seismic station was installed in Casamicciola Observatory in 1993 and since then the seismic monitoring of the island is going up. The real time monitoring of this volcanic island involves several geophysical fields and the data are transmitted by a wide data-communication wired on radio infrastructure to the Monitoring Centre of Osservatorio Vesuviano: - The seismic network counts of 4 station sites with velocimetric, accelerometric and infrasonic sensors. The data are sent in real time to the Monitoring Centre. - The GPS network counts of 6 stations located on the island. All the procedures for remote stations managing (raw data downloading, data quality control and data processing) take place automatically and the computed data are shown in the Monitoring Centre. - The tiltmetric network consist of 3 digital borehole stations distributed around the island. Each tiltmetric station is equipped with a temperature and magnetic sensor.
    Description: Published
    Description: Vienna, Austria
    Description: 1IT. Reti di monitoraggio e sorveglianza
    Keywords: monitoring ; Ischia ; 04. Solid Earth
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 4
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    The Permanent Monitoring System of the Campi Flegrei Caldera, Italy (2022)
    Springer-Verlag GmbH Germany
    Details
    Publication Date: 2022-02-16
    Description: We present the main features of the permanent monitoring system managed by the Istituto Nazionale di Geofisica e Vulcanologia-Osservatorio Vesuviano in the Campi Flegrei caldera. Eruptive history of this active volcano shows that the majority of the eruptive events has been characterised by high explosivity and was accompanied by pyroclastic density currents. Its last eruption occurred in AD 1538 and in the next centuries the Campi Flegrei caldera has experienced several episodes of bradyseism and also the progressive increasing of the urbanisation in the area (west of Naples). Monitoring the dynamics of a mainly explosive volcano completely embedded in a very populated area is a challenging task. In order to detect any variation in the physical and chemical parameters of the Campi Flegrei caldera, the Istituto Nazionale di Geofisica e Vulcanologia-Osservatorio Vesuviano manages a permanent multi-parametric monitoring system. All the recorded h24 continuous data are transmitted to the Monitoring Room of the Osservatorio Vesuviano in Naples, where they are acquired, processed and evaluated to define changes in the dynamical state of the volcano. The caldera, since the end of 2004, is experiencing a bradyseismic episode characterised by a low velocity rate uplift, low energy earthquakes and increasing in the magmatic components of fumarolic fluids. The monitoring and surveillance activity of the Campi Flegrei caldera plays a crucial role in the volcanic emergency plan that includes evacuation of approximately 500,000 people before the beginning of the eruption.
    Description: Published
    Description: 219-237
    Description: 6SR VULCANI – Servizi e ricerca per la società
    Description: 1IT. Reti di monitoraggio e sorveglianza
    Description: 2IT. Laboratori analitici e sperimentali
    Description: 4IT. Banche dati
    Keywords: Campi Flegrei ; Seismic Network ; cGNSS Network ; Tiltmeter Network ; Thermal Infrared Imagery Network ; Geochemical Network ; 04.03. Geodesy ; 04.06. Seismology ; 04.08. Volcanology ; 05.04. Instrumentation and techniques of general interest
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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