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  • 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy  (2)
  • Emilia 2012 sequence  (2)
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Years
  • 1
    Publication Date: 2021-04-20
    Description: Alle ore 02.03 UTC di domenica 20 maggio 2012, la Rete Sismica Nazionale (RSN [Amato and Mele, 2008; Delladio, 2011]) dell’Istituto Nazionale di Geofisica e Vulcanologia (INGV) ha registrato un evento simico di magnitudo locale 5.9 che è stato avvertito in gran parte dell’Italia centro-settentrionale; l’evento è stato localizzato sotto la valle del Po in Emilia (44.89° N, 11.23° E e 6.3 km di profondità). Subito dopo la scossa principale, è stato attivato il Pronto Intervento Sismico dell’INGV al fine di installare una rete sismica temporanea ad integrazione delle stazioni permanenti già presenti in area epicentrale. Grazie alla collaborazione fra le sedi INGV di Ancona, Arezzo, Bologna, Irpinia (Grottaminarda), Milano, Pisa e Roma sono state installate 44 stazioni temporanee, di cui 10 in trasmissione real-time con la sala di sorveglianza simica della sede di Roma. Contemporaneamente altre 38 stazioni sismiche temporanee sono state inoltre installate dal Dipartimento della Protezione Civile – DPC (16 stazioni strong motion), dall’Istituto Nazionale di Oceanografia e di Geofisica Sperimentale – OGS (8 stazioni stand-alone) e da enti francesi (14 stazioni stand-alone). In una seconda fase, l’8 giugno 2012, è stato attivato anche il Centro Operativo Emergenza Sismica (COES [Moretti et al., 2010a]), all’interno della Direzione di Comando e Controllo (Di.Coma.C.) del DPC predisposto presso l’Agenzia della Protezione Civile Regionale dell’Emilia Romagna (Bologna). L’allestimento e il coordinamento della struttura sono stati realizzati grazie alla collaborazione tra il Centro Nazionale Terremoti (CNT) e la Sezione di Bologna. Il COES ha garantito la comunicazione costante e diretta con i funzionari DPC presenti nell'area epicentrale. Allo stesso tempo, la struttura è stata proposta come supporto logistico per tutti i colleghi dell’INGV impegnati in attività nella zona epicentrale (reti sismiche Mobili, EMERSITO, GPS, EMERGEO, QUEST) e per sostenere il servizio dedicato alla “Comunicazione e Informazione” promosso a favore delle popolazioni colpite, degli operatori della protezione civile e dei volontari di soccorso. In questo lavoro saranno descritte le attività svolte nel primo mese di emergenza, le modalità e le tempistiche dell’intervento, le strutture coinvolte.
    Description: Published
    Description: 1-43
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: N/A or not JCR
    Description: open
    Keywords: Emilia 2012 sequence ; Seismic networks ; Seismological data ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Expected Availability
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  • 2
    Publication Date: 2017-04-04
    Description: Following the 26 September 1997 Colforito earthquakes, seismicity occurred for several months along a normal fault system composed by several adjacent NW trending segments distributed from Gualdo Tadino, in the north, to Sellano in the south. Earthquakes were recorded by several temporary seismic networks. We joined data collected from about 100 permanent and temporary seismic stations for a total complete dataset of several thousands of afstershocks. We present high resolution 3-D images of the Umbria-Marche region (central Italy) as derived from the inversion of P and S wave arrival times from $\sim$2000 crustal earthquakes belonging to the seismic crisis. Moreover, from the 3-D location of earthquakes, $\sim$600 focal mechanisms have been calculated by using the first polarities method.
    Description: Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
    Description: Unpublished
    Description: Nice, France
    Description: open
    Keywords: seismic ; umbria-marche ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous ; 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
    Format: 6755312 bytes
    Format: application/pdf
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  • 3
    Publication Date: 2017-04-04
    Description: A 3-D joint inversion of seismic and gravimetric data is performed to re-investigate the subsurface structure of Mt. Vesuvius (Italy) utilizing an improved joint inversion method. The aim is to derive models of the 3D distribution of velocity and density perturbations that are consistent with both data sets and with local velocity models. Mt. Vesuvius is a strato volcano located within a graben (Campania Plain) formed in Plio-Pleistocene. Campania Plain is bordered by mostly Mesozoic carbonaceous rocks. Mt. Vesuvius is the southernmost and the youngest of a group of Pleistocene volcanoes, three of which (Ischia, Campi Flegrei and Mt. Vesuvius) have erupted in historical times. The most recent eruption of Mt. Vesuvius occurred in 1944 and since then the volcanic activity has been characterized by moderate low magnitude seismicity and low temperature fumaroles at the summit crater. We modified the coupling mechanism between velocity and density models in the JI-3D optimized joint inversion method (Jordan and Achauer, 1999). This method was designed to provide stable and high resolution results and involves iterative optimized parameterization, 3D ray tracing, and the incorporation of a priori information. The coupling of the velocity and density models, vital to the joint inversion, is based on a cross-gradient approach (e.g. Gallardo and Meju, 2004), which has been proven to work very well in a variety of cases involving seismic, magnetic, CSEM, MT and gravity data sets. We implemented the cross-gradient coupling for our 3-D irregular adaptive grid parameterization. In contrast to conventional joint inversion methods this approach encourages structural similarities in the models and does not rely on predefined relationships between velocity and density parameters. As a consequence, the resulting velocity-density relations are not contaminated by a priori assumptions and can be utilized to derive rock physical parameters. We apply this method to data from the TomoVes project (Gasparini et al. 1998), combining seismics and Bouguer gravity and local high resolution velocity models as a priori information. The starting models for the joint inversion are derived by separate inversions of the individual data sets. We show 3D distributions of velocity perturbations and density variations from the joint inversion of teleseismic relative traveltimes and Bouguer anomaly data with the aim of extracting further information about the physical status of the volcano- tectonic system.
    Description: Published
    Description: San Francisco, CA, USA
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: open
    Keywords: joint inversion ; teleseismic data ; gravity data ; vesuvius ; 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 4
    Publication Date: 2022-04-22
    Description: No abstract
    Description: Published
    Description: 583-590
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: JCR Journal
    Description: open
    Keywords: Seismological data ; Emilia 2012 sequence ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Expected Availability
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