The filling of the lunar mare basins     

Luciano B. Ronca 《Earth, Moon, and Planets》1973,7(1-2):239-248

The surface of each mare is not a homogeneous geomorphological unit, but displays a variety of geomorphologies. The interpretation of this phenomenon depends on the assumptions one is willing to accept. If the filling of the mare basins occurred relatively slowly, then the geomorphologies are a time function and indicate a time span of not less than three quarters of a billion years between the beginning and the end of the mare filling activity. If, on the other hand, the maria were filled by lava immediately after the basin formation and remained liquid for a relatively long time during which the extensive bombardment stopped, then the different morphologies indicate vagaries in the final stages of the bombardment and of the cooling history.Paper dedicated to Professor Harold C. Urey on the occasion of his 80th birthday on 29 April, 1973.Research conducted at the Lunar Science Institute which is operated by the Universities Space Research Association under Contract No. NSR 09-051-001 with the National Aeronautics and Space Administration. This paper is Lunar Science Institute Contribution No. 109.  相似文献   

Analysis of Extreme Events in Geoelectrical Time Series Measured in a Seismic Area of Southern Appenine Chain (Italy)     

Luciano?TelescaEmail author  Marianna?Balasco  Gerardo?Colangelo  Vincenzo?Lapenna 《Natural Hazards》2005,34(2):177-198

In the present paper we analyse the series of extreme events in geoelectrical signals recorded at the monitoring station Tito located in a seismic area of southern Italy. Applying an objective criterion to estimate the probability of occurrence of extreme events in the time series (Cuomo et al., 1996; Cuomo et al., 1997), we found a correlation between the geoelectrical anomalies and earthquakes in the area monitored during the period of recording.  相似文献   

Local soil failure before general slope failure   总被引：1，自引：0，他引：1  

Gianfranco Urciuoli  Luciano Picarelli  Serge Leroueil 《Geotechnical and Geological Engineering》2007,25(1):103-122

Slopes are generally characterized by non-uniform stress field. Additional stresses induced by changes in boundary conditions can emphasize local differences in the stress level. As a consequence, every failure process is, at first, local, with formation of plastic zones, then general. This is the subject of this paper, which concerns clay slopes, whose failure generally implies formation of a shear zone. A special consideration is addressed to the simple and special case of infinite slope which is also featured by transition from local to general failure, even if stress conditions are uniform along the potential failure plane.  相似文献   

Measuring multifractality in seismic sequences   总被引：6，自引：0，他引：6  

Luciano Telesca  Vincenzo Lapenna 《Tectonophysics》2006,423(1-4):115

We investigated the multifractal structure of the interevent times between successive earthquakes that occurred in Umbria-Marche, which is one of the most seismically active areas of central Italy. We used the Multifractal Detrended Fluctuation Analysis (MF-DFA), which permits detection of multifractality in nonstationary series. Analyzing the time evolution of the multifractal behaviour of the seismic sequence, a loss of multifractality during the aftershocks is revealed.  相似文献   

Local Perceptions of the Livelihood and Conservation Benefits of Small-Scale Livelihood Projects in Rural Madagascar     

Celia A. Harvey  Andoniaina M. Rambeloson  Tokihenintsoa Andrianjohaninarivo  Luciano Andriamaro  Andriambolantsoa Rasolohery  Jeannicq Randrianarisoa 《社会与自然资源》2018,31(9):1045-1063

Small-scale livelihood projects are widely used in forest conservation and Reducing Emissions from Deforestation and Degradation (REDD)+ initiatives; however, there is limited information on how effective these projects are at delivering livelihood and conservation benefits. We explored local perceptions of the effectiveness of small-scale livelihood projects in delivering livelihood and conservation benefits in eastern Madagascar. Our results suggest that small-scale livelihood projects vary greatly in their ability to deliver livelihood benefits, and that the type of livelihood project (e.g., agriculture, beekeeping, fish farming, or livestock production) has a significant impact on which livelihood benefits are delivered. Many small-scale livelihood projects, regardless of project type, are perceived to contribute to forest conservation efforts. Our study highlights that small-scale livelihood projects have the potential to contribute to both improved livelihoods and enhanced forest conservation, but also illustrates the need for more information on the factors that lead to project success.  相似文献   

The role of the lowermost boundary conditions in the hydrological response of shallow sloping covers     

Alfredo Reder  Luca Pagano  Luciano Picarelli  Guido Rianna 《Landslides》2017,14(3):861-873

In many areas of the world, slopes covered by shallow unsaturated non-plastic soil layers experience rainfall-induced landslides causing heavy damage and casualties every year. Landslide occurrence depends on the amount of water infiltrated and stored. Among the contributing factors are the hydraulic conditions at the lowermost boundary, a feature that is often disregarded. The paper focuses on this topic, presenting the results of some laboratory and numerical experiments on ash-pumice interfaces. A strategy is then proposed for selecting the lowermost boundary condition, and some studies are carried out to compare the results obtained with the proposed solution and other more popular ones.  相似文献