Analysis with C- and X-band satellite SAR data of the Portalet landslide area   总被引：1，自引：0，他引：1  

Gerardo Herrera  Davide Notti  Juan Carlos Garc��a-Davalillo  Oscar Mora  Geraint Cooksley  M��nica S��nchez  Alain Arnaud  Michele Crosetto 《Landslides》2011,8(2):195-206

This paper describes the use of the Stable Point Network technique, a Persistent Scatterer Interferometry SAR technique, for the analysis of the Portalet landslide area (Central Pyrenees, Spain). For this purpose, different SAR datasets acquired by ERS-1, ERS-2, ENVISAT and TerraSAR-X satellites have been analysed. The use of different SAR images acquired by satellite radar sensors operating at different microwave lengths has allowed for a comparative assessment and illustration of the advantages and disadvantages of these satellites for landslide detection and monitoring. In the introduction, differential interferometry and the study area are briefly described. Then the specifics of the SPN processing and the results of the different datasets are described and compared. In Analysis of the results: the Portalet landslide area, the Portalet landslide area is introduced and the radar displacement measurements are analysed with available geo-information data. Additionally, X-band measurements are compared with those gathered by a ground-based SAR for a previous project. Finally, the most relevant conclusions of this work are discussed.  相似文献   

Re-testing the JET-X Flight Module No. 2 at the PANTER facility     

Daniele Spiga  Gianpiero Tagliaferri  Paolo Soffitta  Oberto Citterio  Stefano Basso  Ronaldo Bellazzini  Alessandro Brez  Wolfgang Burkert  Vadim Burwitz  Enrico Costa  Luca de Ruvo  Ettore Del Monte  Sergio Fabiani  Gisela Hartner  Benedikt Menz  Massimo Minuti  Fabio Muleri  Giovanni Pareschi  Michele Pinchera  Alda Rubini  Carmelo Sgrò  Gloria Spandre 《Experimental Astronomy》2014,37(1):37-53

The Joint European X-ray Telescope (JET-X) was the core instrument of the Russian Spectrum-X- γ space observatory. It consisted of two identical soft X-ray (0.3–10 keV) telescopes with focusing optical modules having a measured angular resolution of nearly 15 arcsec. Soon after the payload completion, the mission was cancelled and the two optical flight modules (FM) were brought to the Brera Astronomical Observatory where they had been manufactured. After 16 years of storage, we have utilized the JET-X FM2 to test at the PANTER X-ray facility a prototype of a novel X-ray polarimetric telescope, using a Gas Pixel Detector (GPD) with polarimetric capabilities in the focal plane of the FM2. The GPD was developed by a collaboration between INFN-Pisa and INAF-IAPS. In the first phase of the test campaign, we have re-tested the FM2 at PANTER to have an up-to-date characterization in terms of angular resolution and effective area, while in the second part of the test the GPD has been placed in the focal plane of the FM2. In this paper we report the results of the tests of the sole FM2, using an unpolarized X-ray source, comparing the results with the calibration done in 1996.  相似文献   

Adaptive spatial binning of integral-field spectroscopic data using Voronoi tessellations     

Michele Cappellari †  Yannick Copin 《Monthly notices of the Royal Astronomical Society》2003,342(2):345-354

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Stellar kinematics and populations of early-type galaxies with the SAURON and OASIS integral-field spectrographs     

Richard M. McDermid  Roland Bacon  Harald Kuntschner  Eric Emsellem  Kristen L. Shapiro  Martin Bureau  Michele Cappellari  Roger L. Davies  Jesús Falcn-Barroso  Davor Krajnovi&#x;  Reynier F. Peletier  Marc Sarzi  Tim de Zeeuw 《New Astronomy Reviews》2006,49(10-12):521

We summarise the results and achievements of integral-field spectroscopy of early-type galaxies, observed as part of a survey using both the SAURON and OASIS spectrographs. From the perspective of integral-field spectroscopy, these otherwise smooth and featureless objects show a wealth of structure, both in their stellar kinematics and populations. We focus on the stellar content, and examine properties on both kiloparsec scales with SAURON, and scales of 100’s of parsecs with OASIS. These complementary studies reveal two types of kinematically distinct components (KDCs), differing primarily in their intrinsic sizes. In previous studies, KDCs and their host galaxies have generally been found to be unremarkable in other aspects. We show that large KDCs, typical of the well-studied cases, indeed show little or no age differences with their host galaxy. The KDCs detected with the higher spatial-resolution of OASIS are intrinsically smaller and include, in contrast, a significant fraction of young stars. We speculate on the relationship between KDCs and their host galaxies, and the implications for young populations in early-type galaxies.  相似文献   

SOLAR ABUNDANCES OF THE ELEMENTS     

O.K. Manuel  Golden Hwaung 《Meteoritics & planetary science》1983,18(3):209-222

The isotopic compositions of noble gases in the solar wind show high enrichments of light isotopes. When corrected for mass fractionation all five noble gases there can be resolved in terms of the two primitive noble gas components that have been identified in planetary solids. Reasons are presented for assigning the fractionation to a solar process that selectively enriches lighter nuclei at the surface of the Sun. When abundances of the elements at the Sun's surface are corrected for this fractionation, it is shown that atomic abundances for major elements in the bulk Sun are (in decreasing order): Fe, Ni, O, Si, S and Mg. Solar elements at about the 1% atomic abundance level include He, C, Ne, Ca and Cr. These results suggest that fusion of hydrogen is probably not the Sun's primary energy source.  相似文献   

The SAURON project – VI. Line strength maps of 48 elliptical and lenticular galaxies     

Harald Kuntschner  Eric Emsellem  R. Bacon  M. Bureau  Michele Cappellari  Roger L. Davies  P. T. de Zeeuw  Jesús Falcón-Barroso  Davor Krajnovi&#;  Richard M. McDermid  Reynier F. Peletier  Marc Sarzi 《Monthly notices of the Royal Astronomical Society》2006,369(2):497-528

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Relaxation and free modes of a self-gravitating planet     

Michele Caputo 《Geophysical Journal International》1984,77(3):789-808

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The western Durkan Complex (Makran Accretionary Prism,SE Iran): A Late Cretaceous tectonically disrupted seamounts chain and its role in controlling deformation style     

Edoardo Barbero  Luca Pandolfi  Morteza Delavari  Asghar Dolati  Emilio Saccani  Rita Catanzariti  Valeria Luciani  Marco Chiari  Michele Marroni 《地学前缘(英文版)》2021,12(3):101106

The Durkan Complex is a key tectonic element of the Makran accretionary prism (SE Iran) and it has been interpreted as representing a continental margin succession. We present here a multidisciplinary study of the western Durkan Complex, which is based on new geological, stratigraphic, biostratigraphic data, as well as geochemical data of the volcanic and meta-volcanic rocks forming this complex. Our data show that this complex consists of distinct tectonic slices showing both non-metamorphic and very low-grade metamorphic deformed successions. Stratigraphic and biostratigraphic data allow us to recognize three types of successions. Type-I is composed by a Coniacian – early Campanian pelagic succession with intercalation of pillow lavas and minor volcaniclastic rocks. Type-II succession includes a volcanic sequence passing to a volcano-sedimentary sequence with Cenomanian pelagic limestones, followed by a hemipelagic sequence. This succession is characterized by abundant mass-transport deposits. Type-III succession includes volcanic and volcano-sedimentary sequences, which are stratigraphically covered by a Cenomanian platform succession. The latter is locally followed by a hemipelagic sequence. The volcanic rocks in the different successions show alkaline geochemical affinity, suggesting an origin from an oceanic within-plate setting. Our new results indicate that the western Durkan Complex represents fragments of seamounts tectonically incorporated in the Makran accretionary wedge during the latest Late Cretaceous–Paleocene. We propose that incorporation of seamounts in the frontal prism caused a shortening of the whole convergent margin and possibly contributed to controlling the deformation style in the Makran Accretionary Wedge during Late Cretaceous–Paleocene times.  相似文献   

Comparison of statistical methods and multi-time validation for the determination of the shallow landslide rainfall thresholds     

Yuri Galanti  Michele Barsanti  Andrea Cevasco  Giacomo D’Amato Avanzi  Roberto Giannecchini 《Landslides》2018,15(5):937-952

Shallow landslides are unforeseeable phenomena often resulting in critical conditions in terms of people’s safety and damage. The main purpose of this paper is the comparison of different statistical methods used to determine the rainfall thresholds for the shallow landslide occurrence. Rainfall data over a 46-year period were collected for one rain gauge located in a test area of northwest Italy (Riviera Spezzina; RS). In the RS, intense rainfalls often induce shallow landslides causing damage and sometimes casualties. The rainfall events occurred in the 1967–2006 period were classified as events inducing shallow landslides (SLEs_1967–2006) and events that did not trigger shallow landslides (NSLEs_1967–2006). Thresholds for various percentiles of SLEs_1967–2006 were computed by identifying the lower limit above which shallow landslides occurred. Another set of thresholds, corresponding to different probabilities of occurrence, was determined using SLEs_1967–2006 and NSLEs_1967–2006. The least-squares linear fit (LSF) and the quantile regression (QR) techniques were employed in the former approach, while the logistic regression (LR) was applied in the latter. The thresholds were validated with the same data used for their definition and with the data recorded in the 2008–2014 period. Contingency tables were created and contingencies and skill scores were computed. The 10% probability threshold obtained using the LR method is characterized by the best values of at least two skill scores for both periods considered; therefore, it may be considered the “best” threshold for the RS. The results of this work can help the choice of the best statistical method to determine the shallow landslide rainfall thresholds.  相似文献   

LARAM School 2018: the doctoral school on “LAndslide Risk Assessment and Mitigation”     

Leonardo Cascini  Michele Calvello  Sabatino Cuomo 《Landslides》2018,15(7):1445-1447

The international school for PhD students and young doctors on “LAndslide Risk Assessment and Mitigation” (LARAM) is presented and, specifically, information is provided about the next edition of the doctoral school that will held in Italy, at the University of Salerno, on September 3–14, 2018. The LARAM School is managed by the Geotechnical Engineering Group (GEG) of the University of Salerno, which recently became an Associate member of the International Consortium on Landslides (ICL). The 2018 edition of the LARAM School is organised as an ICL/IPL activity.  相似文献