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  • 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous  (4)
  • 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous
  • Editrice Compositori  (3)
  • AIQUA
  • Copernicus Publications
  • MDPI Publishing
  • Nature Publishing Group
  • 2005-2009  (4)
Collection
Years
Year
  • 1
    Publication Date: 2017-04-04
    Description: Seismological modelling of the upper mantle of the Africa-Eurasia collision region has given images of its structure which can be used to supplement surface (geologic) information in the attempt to understand past and active tectonic processes. A foremost feature of the region is given by the sinuous Alpine-Mediterranean thrust belt, under which subducted lithosphere is imaged by seismic tomography as seismically fast material (colder than ambient rock). Several arcuate structures are present, combining an external thrust front with an internal extensional basin, originated by slab rollback: the Hellenic arc with the Aegean basin, the Calabrian arc with the Tyrrhenian Sea, the Betic-Rif with the Alboran Sea, and the Carpathians with the Pannonian basin. These systems are at different stages of their life, and all but the Hellenic-Aegean appear close to their terminal phase. Shape and extent of subducted slabs provide constraints on their evolution. Tomographic results, in all but the Hellenic-Aegean system, show a general lack of overall continuity of the subducted bodies, and in many cases support the idea that other processes, such as slab detachment or mantle delamination, contributed to shape the present day tectonics. Although tomographic results have steadily improved image resolution with time, differences between studies may lead to different interpretations. Better understanding of processes active at the late phases of subduction needs a close interplay between tomography, geology, and mantle dynamics calculations.
    Description: Published
    Description: 179-215
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: open
    Keywords: tomography ; travel time ; Euro-Mediterranean ; mantle ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 2
    Publication Date: 2019-11-04
    Description: We investigate conceptually, analytically, and numerically the biases in the estimation of the b-value of the Gutenberg-Richter Law and of its uncertainty made through the least squares technique. The biases are introduced by the cumulation operation for the cumulative form of the Gutenberg-Richter Law, by the logarithmic transformation, and by the measurement errors on the magnitude. We find that the least squares technique, applied to the cumulative and binned form of the Gutenberg-Richter Law, produces strong bias in the b-value and its uncertainty, whose amplitudes depend on the size of the sample. Furthermore, the logarithmic transformation produces two different endemic bends in the Log(N) versus M curve. This means that this plot might produce fake significant departures from the Gutenberg-Richter Law. The effect of the measurement errors is negligible compared to those of cumulation operation and logarithmic transformation. The results obtained show that the least squares technique should never be used to determine the slope of the Gutenberg-Richter Law and its uncertainty.
    Description: Published
    Description: 329-339
    Description: JCR Journal
    Description: open
    Keywords: b-value ; seismology ; least squares technique ; syntheticearthquake catalogs ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
    Publication Date: 2017-04-04
    Description: Il 5 settembre 1950 alle ore 04.08 (GMT), un forte terremoto fu avvertito in tutta l’Italia centrale e arrecò gravi danni in diversi centri abitati delle province di Teramo, Pescara, L’Aquila e Rieti. Questo evento è considerato il massimo terremoto storico avvenuto nell’area del Gran Sasso d’Italia, zona che, secondo i cataloghi sismici italiani è caratterizzata da un’attività sismica relativamente modesta. Al contrario le zone circostanti sono sede di sismicità più frequente e di forti terremoti storici. Questo lavoro è uno studio di revisione del terremoto che colpì l'area del 5 settembre 1950 e del periodo sismico che ne seguì tra il 1950 e il 1951. Scopo della ricerca è quello di ampliare il quadro delle conoscenze su questo sisma e di inquadrarlo nel contesto sismotettonico dell'area. La ricerca ha condotto al reperimento di moltissimi documenti originali, sinora inediti, sia relativi alla scossa del 5 settembre 1950, che a quella dell’8 agosto 1951 che rappresenta l’evento più forte del periodo sismico successivo alla scossa principale. I risultati riguardano una maggiore completezza delle informazioni sul terremoto, anche relativamente al ruolo delle repliche nel quadro del danneggiamento. Il numero dei punti di intensità risulta triplicato rispetto a quanto finora conosciuto. Gli elementi di analisi contribuiscono al calcolo di nuovi parametri ipocentrali e a fornire una ipotesi interpretativa riguardo alla sorgente responsabile del terremoto. In base ai dati acquisiti sulla distribuzione del danno è possibile ipotizzare che il terremoto del 1950 sia stato causato da una sorgente con direzione circa E-O, al di sotto dell’edificio strutturale della Laga, tra Campotosto e Pietracamela.
    Description: Published
    Description: 195-214
    Description: reserved
    Keywords: Gran sasso d'Italia, ; terremoto del 1950 ; macrosismica ; sismotettonica ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
    Publication Date: 2019-11-04
    Description: Dr. Benouar presents a full and integrated study of the recent seismicity of Algeria and adjacent regions during the twentieth century. He has amassed an impressive amount of macroseismic information pertaining to individual earthquakes, which he combines with instrumental information to reassess the origin parameters of each event. In any compilation of earthquakes it is the additional information beyond the bare accumulation of figures and facts that adds interest and social understanding to the scientific appreciation of the earthquakes themselves. For this it is necessary to know the local conditions, and Dr. Benouar brings out for us very vivid1y the differences between reporting procedures at different times this century, and the ensuing difficulties. It would be most difficult for an outsider to gather the information he presents, and he makes good use of his knowledge of his native land, as well as his professional training as an engineer. We thus learn of the reluctance of the colonial powers to report on damage or casualties outside those inflicted on the expatriate community, and the general difficulties of finding information about earthquakes that occurred during the wars of independence, at a time when effects of even major earthquakes were sometimes minor compared to those of the war itself. He also does not spare us details of political difficulties that arose during periods of reconstruction following recent earthquakes. This work is not restricted, however, to description. He examines the underlying tectonics of the area and deduces estimates of hazard and risk in various parts of the country. He then proceeds to examine the engineering consequences and discuss future needs for building codes and civil protection. Dr. Benouar has produced a work which could well form a model for those wishing to undertake comprelzensive studies of seismicity of other areas, and the measures needed to reduce the effects of catastrophic earthquakes.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: seismology ; Algeria ; 20th century ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous ; 04. Solid Earth::04.06. Seismology::04.06.05. Historical seismology ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk ; 05. General::05.02. Data dissemination::05.02.02. Seismological data
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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