A mixed automatic-manual seismic catalog for Central-Eastern Italy: analysis of homogeneity

Cattaneo, M.; Frapiccini, Massimo; Ladina, Chiara; Marzorati, S.; Monachesi, G.

doi:10.4401/ag-7333

Cited by 7 publications

(5 citation statements)

References 11 publications

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“…S4 ). These locations (EQS-Catalog in supplementary material) were derived from developing a mixed automatic-manual seismic catalog for eastern Central Italy 35 , 36 . We used P- and S-phases detected by human operators (period 2009–2013) and by the automatic RSNI-Picker (period 2014–2016) and its updated version (2017) 37 .…”

Section: Datasetsmentioning

confidence: 99%

Lithospheric double shear zone unveiled by microseismicity in a region of slow deformation

Nardis

Pandolfi

Cattaneo

et al. 2022

Sci Rep

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The deformation style of the continental lithosphere is a relevant issue for geodynamics and seismic hazard perspectives. Here we show the first evidence of two well-distinct low-angle and SW-dipping individual reverse shear zones of the Italian Outer Thrust System in Central Italy. One corresponds to the down-dip prosecution of the Adriatic Basal Thrust with its major splay and the other to a hidden independent structure, illuminated at a depth between 25 and 60 km, for an along-strike extent of ~ 150 km. Combining geological information with high-quality seismological data, we unveil this novel configuration and reconstruct a detailed 3D geometric and kinematic fault model of the compressional system, active at upper crust to upper mantle depths. In addition, we report evidence of coexisting deformation volumes undergoing well-distinguished stress fields at different lithospheric depths. These results provide fundamental constraints for a forthcoming discussion on the Apennine fold-and-thrust system's geodynamic context as a shallow subduction zone or an intra-continental lithosphere shear zone.

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Section: Datasetsmentioning

confidence: 99%

Lithospheric double shear zone unveiled by microseismicity in a region of slow deformation

Nardis

Pandolfi

Cattaneo

et al. 2022

Sci Rep

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“…The difficulty in considering this parameter is due to the uncertainty associated with the depth itself, not only for historical earthquakes but also for recent events located in areas that are geologically complex or not monitored by a dense seismic network. To explore the variation in the attenuation steepness with depth, we therefore used three of the models that explicitly include this parameter: the IPE by Tosi et al (2015), the IPE by Musson (2013), and the GMPE by Cauzzi and Faccioli (2008). We chose these functions because they feature a simple functional form which determines a magnitude-independent attenuation steepness, as suggested by real earthquake data.…”

Section: Comparison With Synthetic Modelsmentioning

confidence: 99%

“…In addition we show that, even using an IPE, 50 km is a reasonable limit for a linear regression that approximates the first part of the attenuation curve well. Figure 7b shows the steepness of the regression lines, thus calculated as a function of the earthquake focal depth, and the values, calculated with the same method, derived from PGA using the GMPE proposed by Cauzzi and Faccioli (2008), converted into macroseismic intensity. It is worth noting that differences caused by the use of two different conversion equations are greater than the differences caused by the use of the IPE in place of the GMPE.…”

Section: Comparison With Synthetic Modelsmentioning

confidence: 99%

Inferring the depth and magnitude of pre-instrumental earthquakes from intensity attenuation curves

Sbarra

Burrato

Rubeis

et al. 2023

Nat. Hazards Earth Syst. Sci.

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Abstract. The Italian historical earthquake record is among the richest worldwide; as such it allows for the development of advanced techniques for retrieving quantitative information by calibration with recent earthquakes. Building on a pilot elaboration of northern Italian earthquakes, we developed a procedure for determining the hypocentral depth of all Italian earthquakes from macroseismic intensity data alone. In a second step the procedure calculates their magnitude, taking into account the inferred depth. Hypocentral depth exhibits substantial variability countrywide but has so far received little attention: pre-instrumental earthquakes were routinely “flattened” at the upper-crustal level (∼10 km), on the grounds that the calculation of hypocentral depth is heavily dependent on the largely unknown local propagation properties. We gathered a learning set of 42 earthquakes documented by reliable instrumental data and by numerous macroseismic intensity observations. We observe (1) that within 50 km from the epicenter the ground motion attenuation rate is primarily controlled by hypocentral depth and largely independent of magnitude, (2) that within this distance the fluctuations in crustal attenuation properties are negligible countrywide, and (3) that knowing both the depth and the expected epicentral intensity makes it possible to estimate a reliable magnitude.

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“…The continuous seismic data recorded by the 19 accelerometers are transmitted in real time and processed after the automatic detection of an earthquake by the acquisition system of the regional seismic network in Ancona ONT-INGV headquarter (Cattaneo et al, 2017). A time window containing the earthquake waveform is extracted: the start is 10 s before P arrival and the length is the double time of significant duration D, calculated from 5 to 95% of the Arias Intensity (Cauzzi et al, 2016).…”

Section: Structural Health Monitoring For the Strategic Public Buildingsmentioning

confidence: 99%

Urban Seismic Networks, Structural Health and Cultural Heritage Monitoring: The National Earthquakes Observatory (INGV, Italy) Experience

D’Alessandro

Costanzo

Ladina

et al. 2019

Front. Built Environ.

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A multiscale approach to the monitoring of earthquakes and their effects can represent an effective tool for the reduction of seismic risk. Devoted monitoring networks are essential to cope with the seismic emergency in urban areas, to assess the damage scenarios, which are useful for the preservation of the strategic functions and services and to improve the community resilience to earthquakes. The National Earthquake Observatory, Italian Institute for Geophysics and Volcanology (ONT-INGV, Italy), has been recently involved in several projects devoted to the reduction of seismic risk by means of the implementation of urban-scale and building-scale monitoring networks. Such systems represent a necessary support for the well-established national seismic network. All these approaches (country, urban, and building scale) could be framed within of a unique system in which each part holds different tasks, with the common final objective of the earthquake risk reduction. In this paper different approaches, experiences and potential capabilities on urban seismic networks, structural health and cultural heritage monitoring implemented in Italy by the ONT-INGV will be presented, with the ultimate goal of achieving an effective integrated multi-scale system.

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A mixed automatic-manual seismic catalog for Central-Eastern Italy: analysis of homogeneity

Abstract: A comparison between pickings and locations obtained by automatic and manual procedures in the analysis of the seismicity of Central-East

Cited by 7 publications

References 11 publications

Lithospheric double shear zone unveiled by microseismicity in a region of slow deformation

Lithospheric double shear zone unveiled by microseismicity in a region of slow deformation

Inferring the depth and magnitude of pre-instrumental earthquakes from intensity attenuation curves

Urban Seismic Networks, Structural Health and Cultural Heritage Monitoring: The National Earthquakes Observatory (INGV, Italy) Experience

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