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Carmelo Cassisi Marco Aliotta Andrea Cannata Placido Montalto Domenico Patanè Alfredo Pulvirenti Letizia Spampinato 《Pure and Applied Geophysics》2013,170(4):529-545
Algorithms searching for similar patterns are widely used in seismology both when the waveforms of the events of interest are known and when there is no a priori-knowledge. Such methods usually make use of the cross-correlation coefficient as a measure of similarity; if there is no a-priori knowledge, they behave as brute-force searching algorithms. The disadvantage of these methods, preventing or limiting their application to very large datasets, is computational complexity. The Mueen–Keogh (MK) algorithm overcomes this limitation by means of two optimization techniques—the early abandoning concept and space indexing. Here, we apply the MK algorithm to amplitude time series retrieved from seismic signals recorded during episodic eruptive activity of Mt Etna in 2011. By adequately tuning the input to the MK algorithm we found eight motif groups characterized by distinct seismic amplitude trends, each related to a different phenomenon. In particular, we observed that earthquakes are accompanied by sharp increases and decreases in seismic amplitude whereas lava fountains are accompanied by slower changes. These results demonstrate that the MK algorithm, because of its particular features, may have wide applicability in seismology. 相似文献
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Mariastella Pulvirenti 《The Australian geographer》2000,31(2):237-249
Studies on Australian migrants and housing consistently confirm that the Italianborn have the highest home-ownership rates of all birthplace groups in Australia. Only a few studies have suggested explanatory factors, including agrarian histories and economic aspirations. This paper demonstrates that home ownership for post-war Italian migrants to Australia was indeed conditioned by these and other factors, but within the broader process of migration. Conditions of poverty in Italy made sistemazione (settling down) the goal of migration. Built into sistemazione was a gendered moral imperative to achieve it. Work experiences demonstrate how this imperative conditioned home ownership in Australia. 相似文献
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Cintolesi Carlo Pulvirenti Beatrice Sabatino Silvana Di 《Boundary-Layer Meteorology》2021,180(1):79-104
Boundary-Layer Meteorology - Techniques for improving the removal of pollution from urban canyons are crucial for air quality control in cities. The removal mainly occurs at the building roof... 相似文献
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A. Adriani F. Cairo L. Pulvirenti F. Cardillo M. Viterbini G. Di Donfrancesco J. P. Pommereau 《Annales Geophysicae》1999,17(10):1352-1360
The Stratospheric Regular Sounding project was planned to measure regularly the vertical profiles of several tracers like ozone, water vapor, NOx, ClOx and BrOx radicals, aerosol, pressure and temperature, at three latitudes, to discriminate between the transport and photochemical terms which control their distribution. As part of this project, the “Istituto di Fisica dell’Atmosfera” launched nine laser backscattersondes (LABS) on board stratospheric balloons to make observations of background aerosol and PSCs. LABS was launched with an optical particle counter operated by the University of Wyoming. Observations have been performed in the arctic, mid-latitudes and tropical regions in different seasons. Polar stratospheric clouds have been observed in areas inside and outside the polar vortex edge. A background aerosol was observed both in mid-latitudes and in arctic regions with a backscattering ratio of 1.2 at 692 nm. Very stratified aerosol layers, possibly transported into the lower stratosphere by deep convective systems, have been observed in the lower stratosphere between 20 and 29 km in the tropics in the Southern Hemisphere. 相似文献
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