Options
Loreto, V.
Loading...
Preferred name
Loreto, V.
3 results
Now showing 1 - 3 of 3
- PublicationRestrictedSpace-time combined correlation between earthquakes and a new, self-consistent definition of aftershocks(2006)
; ; ; ; ;De Rubeis, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Loreto, V.; ”La Sapienza” University, Physics Department, and INFM, Center for Statistical Mechanics and Complexity, Roma, Italy ;Pietronero, L.; ”La Sapienza” University, Physics Department, and INFM, Center for Statistical Mechanics and Complexity, Roma, Italy ;Tosi, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia; ; ; ; ; ; ;Bhattacharyya, P.Chakrabarti, B.Seismicity is recognized to be a complex natural phenomenon either in space, time and energy domains: earthquakes occur as a sudden energy release after a strongly variable time period of stress accumulation, in locations not deterministically defined, with magnitude range spanning over several orders. But seismicity is certainly not a pure random process: spatial locations of events clearly display correlations with tectonic structures at all scales (from plates borders to small faults settings); on the other hand time evolution is clearly linked with strongest shocks occurrence and energy distribution displays hierarchical features. Although it is still not possible to propose deterministic models for earthquakes, well established statistical relations constrain seismicity under very specific and intriguing relations.146 18 - PublicationOpen AccessSpace-time combined correlation integral and earthquake interactions(2004)
; ; ; ; ;Tosi, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;De Rubeis, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Loreto, V.; Centro INFM di Meccanica Statistica e Complessità, Università La Sapienza, Roma, Italy ;Pietronero, L.; Centro INFM di Meccanica Statistica e Complessità, Università La Sapienza, Roma, Italy; ; ; Scale invariant properties of seismicity argue for the presence of complex triggering mechanisms. We propose a new method, based on the space-time combined generalization of the correlation integral, that leads to a self-consistent visualization and analysis of both spatial and temporal correlations. The analysis has been applied on global medium-high seismicity. Results show that earthquakes do interact even on long distances and are correlated in time within defined spatial ranges varying over elapsed time. On that base we redefine the aftershock concept.183 283 - PublicationRestrictedSpace–time correlation of earthquakes(2008-06)
; ; ; ; ;Tosi, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;De Rubeis, V.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Loreto, V.; 'La Sapienza' University, Physics Department, and INFM, Center for Statistical Mechanics and Complexity, Roma, Italy ;Pietronero, L.; 'La Sapienza' University, Physics Department, and INFM, Center for Statistical Mechanics and Complexity, Roma, Italy; ; ; Seismicity is a complex process featuring non-trivial space–time correlations in which several forms of scale invariance have been identified. A frequently used method to detect scale-invariant features is the correlation integral, which leads to the definition of a correlation dimension separately in space and time. In this paper, we generalize this method with the definition of a space–time combined correlation integral. This approach allows us to analyse medium-strong seismicity as a point process, without any distinction among main, after or background shocks. The analyses performed on the catalogue of worldwide seismicity and the corresponding reshuffled version strongly suggest that earthquakes of medium-large magnitude are time clustered inside specific space–time regions. On the basis of this feature, we recognize a space–time domain statistically characterized by sequences' behaviour and a domain of temporal randomness. Then, focusing on the spatial distribution of hypocentres, we find another domain confined to short distances and characterized by a relatively high degree of spatial correlation. This spatial domain slowly increases with time: we interpret this as the ‘afterevent’ zone representing the set of all subsequent events located very near (about 30 km) to each reference earthquake and embedded on specific seismogenic structures such as faults planes.245 23