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   

Bounding the time delay between high-energy neutrinos and gravitational-wave transients from gamma-ray bursts     

Bruny Baret  Imre Bartos  Boutayeb Bouhou  Alessandra Corsi  Irene Di Palma  Corinne Donzaud  Vronique Van Elewyck  Chad Finley  Gareth Jones  Antoine Kouchner  Szabolcs Mrka  Zsuzsa Mrka  Luciano Moscoso  Eric Chassande-Mottin  Maria Alessandra Papa  Thierry Pradier  Peter Raffai  Jameson Rollins  Patrick Sutton 《Astroparticle Physics》2011,35(1):1-7

We derive a conservative coincidence time window for joint searches of gravitational-wave (GW) transients and high-energy neutrinos (HENs, with energies ?100 GeV), emitted by gamma-ray bursts (GRBs). The last are among the most interesting astrophysical sources for coincident detections with current and near-future detectors. We take into account a broad range of emission mechanisms. We take the upper limit of GRB durations as the 95% quantile of the T₉₀’s of GRBs observed by BATSE, obtaining a GRB duration upper limit of ∼150 s. Using published results on high-energy (>100 MeV) photon light curves for 8 GRBs detected by Fermi LAT, we verify that most high-energy photons are expected to be observed within the first ∼150 s of the GRB. Taking into account the breakout-time of the relativistic jet produced by the central engine, we allow GW and HEN emission to begin up to 100 s before the onset of observable gamma photon production. Using published precursor time differences, we calculate a time upper bound for precursor activity, obtaining that 95% of precursors occur within ∼250 s prior to the onset of the GRB. Taking the above different processes into account, we arrive at a time window of t_HEN − t_GW ∈ [−500 s, +500 s]. Considering the above processes, an upper bound can also be determined for the expected time window of GW and/or HEN signals coincident with a detected GRB, t_GW − t_GRB ≈ t_HEN − t_GRB ∈ [−350 s, +150 s]. These upper bounds can be used to limit the coincidence time window in multimessenger searches, as well as aiding the interpretation of the times of arrival of measured signals.  相似文献   

Discussion on “A rapid loess flowslide triggered by irrigation in China” by D. Zhang,G. Wang,C. Luo,J. Chen,and Y. Zhou   总被引：1，自引：0，他引：1  

Luciano Picarelli 《Landslides》2010,7(2):203-205

Catastrophic debris flows hit many areas in the world. Surprisingly, the features of the materials which are involved are often very similar as well as the causes of rupture and the mechanics of resulting movement. A continuous exchange of ideas among people involved in studies and investigations could be highly beneficial in the setting up of reliable criteria for risk mitigation.  相似文献