CFTI5Med, Catalogo dei Forti Terremoti in Italia (461 a.C.-1997) e nell’area Mediterranea (760 a.C.-1500)

Guidoboni, Emanuela; Ferrari, Graziano; Mariotti, Dante; Comastri, A.; Tarabusi, Gabriele; Sgattoni, Giulia; Valensise, Gianluca

doi:10.6092/ingv.it-cfti5

Cited by 35 publications

(14 citation statements)

References 2 publications

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“…Furthermore, we argue that the geometry and the frictional properties of the segmented system affects the degree of interseismic coupling. This likely leads to differences in recurrence intervals and maximum magnitude between mature listric faults and younger high-angle normal faults as exhibited by the historical seismicity and paleoseismology across Central Apennines (e.g., Cinti et al, 2018;Falcucci et al, 2018;Galadini & Galli, 2003;Galli et al, 2019;Guidoboni et al, 2018).…”

Section: Discussionmentioning

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: Discussionmentioning

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 study area corresponds to the buried frontal portion of the compressive ramp and flat structures of the Apennines (Toscani et al 2009;Martelli et al 2017). The active faults are associated with moderate seismic activity (Michetti et al 2012), characterized by shallow epicenters, well documented through the last centuries (Locati et al 2011;Guidoboni et al 2018). However, taking into account the social and economic regional context, the related expected seismic risk is rather high.…”

Section: Geological and Seismological Settingmentioning

confidence: 99%

“…However, taking into account the social and economic regional context, the related expected seismic risk is rather high. The most significant historic earthquake, that impacted the Ferrara area in November 1570 (VIII MCS, estimated moment magnitude M w = 5.5), induced sand liquefaction and ground fracturing, both within the town of Ferrara (Guidoboni et al 2018) and in the Reno River sediments at San Carlo, that also exhibited liquefaction in 2012 (Caputo et al 2016).…”

Section: Geological and Seismological Settingmentioning

confidence: 99%

Liquefied sites of the 2012 Emilia earthquake: a comprehensive database of the geological and geotechnical features (Quaternary alluvial Po plain, Italy)

Minarelli

Amoroso

Civico

et al. 2022

Bull Earthquake Eng

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This paper presents a comprehensive geological and geotechnical study of the whole area affected by liquefaction following the 2012 Emilia earthquakes, including all the available information from the field reconnaissance surveys, in situ tests, and laboratory analyses. The compilation was performed at 120 liquefied sites to verify and validate the reliability of liquefaction charts in alluvial sediments, and to assess liquefaction induced by the 2012 seismic sequence in the Emilia plain. The results reveal a wide range of grain sizes (from clean sands to sandy silts) and compositional characteristics (quartz-rich to litharenitic) in the 2012 ejecta, and show a strong relationship between the liquefaction and stratigraphic architecture of the subsurface. The availability of in situ tests at the liquefied sites makes it possible to verify and validate the reliability of the liquefaction charts in alluvial sediments with respect to the real observations. For the analyzed Emilia case studies, the use of non-liquefiable crust provides better estimations of the liquefaction manifestations when coupled with the thickness of the liquefiable layer rather than with the liquefaction potential index. Altogether, this work makes available to the international scientific community a consistent liquefaction database for in-depth earthquake studies.

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“…After removing the aftershocks using the declustering algorithm by Gardner and Knopoff, (1974), the selected dataset comprises the 13 earthquakes described in Table 1, whose magnitude and time distribution are represented by the red bars in Figure 2. The earthquakes produced macroseismic effects ranging from heavy damage and collapse of a few buildings up to generalized destruction (maximum macroseismic intensity between VIII and XI in the Mercalli-Cancani-Sieberg scale), in all the cases with victims (Guidoboni et al, 2018(Guidoboni et al, , 2019. The two strongest and most lethal earthquakes were those of 1915 (Marsica earthquake, Mw 7.1) and 1980 (Irpinia-Basilicata earthquake, Mw 6.8).…”

Section: Datamentioning

confidence: 99%

Evidence of the climate control of strong seismicity in the Italian Apennines through groundwater recharge

Bragato

2022

Front. Earth Sci.

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This work explores the possibility that the destructive earthquakes occurring along the Apennine Chain in Italy are systematically triggered by groundwater recharge. The focus is on multi-year transitions toward phases of wet climate rather than on short-term heavy rainfall occurring in a few days or seasonally. The analysis takes into consideration the earthquakes with a moment magnitude of Mw ≥5.8 that have occurred since 1901. Their time distribution is compared with the fluctuations of the self-calibrated Palmer Drought Severity Index (scPDSI), an indicator of soil moisture, here assumed to be a proxy for groundwater recharge. It is found that the scPDSI evolved through six main oscillations lasting from 11 to 25 years, and that, with one exception, the strongest earthquake in each phase is placed within 2 years from the maximum of soil moisture. Based on a statistical test for pairs of point processes, such a coincidence indicates a significant synchrony between the two phenomena. In particular, the two strongest earthquakes of the study period (the 1915 Marsica earthquake and the 1980 Irpinia–Basilicata earthquake, with moment magnitudes of Mw 7.1 and 6.8, respectively) occurred exactly in the year of two of the largest peaks of scPDSI. The connection between wet climate conditions and the occurrence of strong earthquakes is further investigated by comparing the time distribution of Mw ≥6.1 historical earthquakes that have occurred since 1200 AD with the evolution of the Great Aletsch Glacier in Switzerland, representative of water accumulation at the continental level. Even in this case, the earthquakes clustered during time periods of increased precipitation and lower water evaporation, corresponding to the extreme phases of the Little Ice Age. The agreement of the results at different time scales and using different climate indexes leads to postulate a significant and systematic role of groundwater recharge in the triggering of large earthquakes along the Apennines. It is also suggested that the earthquakes might be triggered by pore-pressure propagation, where the necessary hydraulic continuity is made possible by the intersection of the shallow karst structures with the seismogenic faults.

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CFTI5Med, Catalogo dei Forti Terremoti in Italia (461 a.C.-1997) e nell’area Mediterranea (760 a.C.-1500)

Cited by 35 publications

References 2 publications

Seismicity Rate Changes and Geodetic Transients in Central Apennines

Seismicity Rate Changes and Geodetic Transients in Central Apennines

Liquefied sites of the 2012 Emilia earthquake: a comprehensive database of the geological and geotechnical features (Quaternary alluvial Po plain, Italy)

Evidence of the climate control of strong seismicity in the Italian Apennines through groundwater recharge

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