Catalogo Parametrico dei Terremoti Italiani (CPTI15), versione 2.0

Rovida, Andrea; Locati, Mario; Camassi, Romano; Lolli, Barbara; Gasperini, Paolo

doi:10.13127/cpti/cpti15.2

Cited by 41 publications

(30 citation statements)

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“…Historical and recent destructive earthquakes in the Central Apennines, Italy (Amato et al, 1998;Chiaraluce et al, 2017;Rovida et al, 2011;Valoroso et al, 2013) occur mostly along the NW-SE trending system of normal faults, where 2 to 3 mm/year of extension perpendicular to the Apennines is accommodated (D'Agostino et al, 2011). The fault system is located above a delaminating Adria lithosphere (Aoudia et al, 2007;Chimera et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Seismicity Rate Changes and Geodetic Transients in Central Apennines

Vičič

Aoudia

Borghi

et al. 2020

Geophysical Research Letters

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Using template matching and GPS data, we investigate the evolution of seismicity and observable deformation in Central Apennines. Seismicity appears more persistent at the base of the seismogenic layer than in the shallower crust. Diffuse activity is reported on segments at depth, alternating along strike with apparent quiescence on segments that experienced one or more Mw6+ earthquakes in 1997, 2009, and 2016. Central Apennines are likely underlain by a sizeable shear zone with areas of diffuse seismicity bounding shallow normal faults where Mw6+ earthquakes occurred. The deformation observed at the surface seems to follow the seismicity variations at the base of seismogenic layer along the Apenninic chain. Principal and independent component analyses of GPS data exhibit a transient when the 2016 foreshock sequence starts. This transient propagated northward from the Campotosto fault up to the Alto Tiberina fault system and has likely loaded the Mw6+ 2016 earthquake sequence. Plain Language Summary We use a nonstandard method for the detection of microseismicity at depth augmenting the available catalog. The enhanced seismicity distribution is coupled with the observable deformation on a geodetic network of continuous GPS to infer a better comprehension of the earthquake behavior. The earthquake patterns in Central Apennines reveal a segmentation at depth along an almost flat base of seismogenic layer with alternating low and high seismicity rate segments. The deformation recorded at the surface seems to follow the seismicity variations at the base of seismogenic layer along the Apenninic chain also determining a possible seismic-aseismic mode. We suggest that aseismic deformation has a fundamental role in the tectonic loading and that seismicity, even if heterogeneously distributed, could represent a tracer of it. This conclusion is also supported by the evidence of a transient propagating from south to north during the 2016 Central Italy sequence.

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Section: Introductionmentioning

confidence: 99%

Seismicity Rate Changes and Geodetic Transients in Central Apennines

Vičič

Aoudia

Borghi

et al. 2020

Geophysical Research Letters

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“…The northern part of Sicily, in front of the Tyrrhenian Sea where Caronia is located, is a place of frequent, intense and deep seismicity [11]. This peculiarity attracted many seismologists, explaining the large number of papers dealing with it [12,13].…”

Section: Seismicity Of the Study Areamentioning

confidence: 99%

2-D Seismic Response Analysis of a Slope in the Tyrrhenian Area (Italy)

et al. 2021

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The Caronia area is located in the Tyrrhenian north-eastern sector of Sicily (Italy). Starting in 2010, attention focused on the study of landslides phenomena that occurred in this area, which caused significant economic damage to buildings and infrastructures and loss of productive activities. The site is characterized by geotechnical, geological and morphological heterogeneity, and for this reason the site is particularly prone to seismic topographic amplification effects. In this paper, the authors carried out numerical studies focused on the topographic seismic effect evaluation concerning the slope affected by the landslide phenomena. For this site, geotechnical characterization was available concerning both in-situ and laboratory tests; boreholes, piezometers, down-hole tests, multichannel analysis of surface waves tests, seismic tomographies and inclinometer measurements were carried out. Furthermore, 1-D and 2-D local seismic response analyses were carried out by using different synthetic seismograms related to the earthquake of Messina and Reggio Calabria on 28 December 1908. The results of the numerical analyses are presented in terms of response seismograms and response spectra at the surface.

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“…we first extend their experimental method to the whole Italian territory and to the whole pre-1984 earthquake catalogue (CPTI15 v 2.0, Rovida et al, 2019Rovida et al, , 2020. This method was shown to be independent of magnitude, meaning that the slope of the attenuation curve calculated within 50 km from the epicenter is affected only by earthquake depth, not by earthquake size;…”

Section: Introductionmentioning

confidence: 99%

“…Comparison of Mw estimates. The source of Mw (Boxer code) is the CPTI15 catalogue, v2.0(Rovida et al, 2019), with the only exception of the last three events, whose Mw is fromRossi et al (2019). The Mw (y-intercept) is from this work.…”

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confidence: 99%

Modern earthquakes as a key to understanding those of the past: the intensity attenuation curve speaks about earthquake depth and magnitude

Sbarra

Burrato

Rubeis

et al. 2022

Preprint

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Abstract. The Italian historical earthquake record is among the richest worldwide; as such it allows the development of advanced techniques for retrieving quantitative information by calibration with recent earthquakes. Building on a pilot elaboration of northern Italy earthquakes, we developed a procedure for determining the focal depth of all Italian earthquakes from intensity data alone. In a second step the procedure calculates their magnitude, taking into account the inferred depth. Focal depth exhibits a substantial variability countrywide, but so far received little attention: pre-instrumental earthquakes were routinely "flattened" at upper crustal level (~10 km), on the grounds that the calculation of focal 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 intensity observations. Rather unexpectedly we observe (1) that within 50 km from the epicenter the ground motion attenuation rate is primarily controlled by focal depth and largely independent of magnitude; (2) that within this distance the fluctuations of 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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Catalogo Parametrico dei Terremoti Italiani (CPTI15), versione 2.0

Cited by 41 publications

References 0 publications

Seismicity Rate Changes and Geodetic Transients in Central Apennines

Seismicity Rate Changes and Geodetic Transients in Central Apennines

2-D Seismic Response Analysis of a Slope in the Tyrrhenian Area (Italy)

Modern earthquakes as a key to understanding those of the past: the intensity attenuation curve speaks about earthquake depth and magnitude

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