排序方式： 共有16条查询结果，搜索用时 15 毫秒
1.
Aref M. O. AL-JABALI NIE Lei Abdo S. AL-MAQTARY Hussein AL-AKHALI Mohammed HAZAEA Fadel AL-AGHBARI 《世界地质(英文版)》2009,12(1):5-12
According to topography of Yemen, most areas and villages are located at obligated crest, toe of mountain and under cliffs. Therefore Al-Huwayshah consisting of Tawilah sandstone group is characterized by steep slope reach to 90° in some areas. This area is affected by strong tectonic movements and faults that occurred during the geological epochs. This effect enhances to find out fractures and joints as well as the rocks become brittle and ready to slide depending on the position of area. And there are some fractures and joints on the surface of the areas due to tectonic movement associated with opening the Red Sea and Gulf of Aden. The rainfalls, fractures, joints, earthquakes, gravity, vegetations, temperatures and human activities play a big role in the processes of rockfalls and landslides in this area. All those factors are considered as the basic causes and catalyzed factors for occurrence of rockfall in the studide area. In addition, the authors carried out laboratory test for many rock samples to get the physical properties of the rocks. 相似文献
2.
Aref M.O.AL-JABALI Abdo S.AL-MAQTARY Hussein AL-AKHALI Mohammed HAZAEA Fadel AL-AGHBARI 《东北亚地学研究》2009,(1)
According to topography of Yemen,most areas and villages are located at obligated crest,toe of mountain and under cliffs.Therefore Al-Huwayshah consisting of Tawilah sandstone group is characterized by steep slope reach to 90° in some areas.This area is affected by strong tectonic movements and faults that occurred during the geological epochs.This effect enhances to find out fractures and joints as well as the rocks become brittle and ready to slide depending on the position of area.And there are some frac... 相似文献
3.
Letícia Fleck Fadel Miguel Jorge Daniel Riera Ignacio Iturrioz 《国际地质力学数值与分析法杂志》2008,32(15):1857-1881
The numerical fracture analysis of non‐homogeneous rock or concrete dowels subjected to shear and compression is described in detail. The method of analysis allows the consideration of scale and rate effects due to material non‐homogeneity and fracture. The proposed approach is verified by comparing numerical predictions with experimental results reported in the literature for a series of small rock samples, since experimental evidence for large bodies is not yet available (2007). Results generated by Monte Carlo simulation using the so‐called discrete element method to model the dowels suggest that a simple three parameters law can be used to predict the relationship between tangential stress at the base and lateral distortion. It is observed that the larger the size of the cubes, the smaller both the peak tangential stress and the rupture distortion. Size effects are also evaluated in samples with vertical restraint. The influence of loading rate is likewise numerically assessed for two sample sizes. The effect is compatible with experimental evidence available for concrete using small samples. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
4.
Tanyaş Hakan Görüm Tolga Fadel Islam Yıldırım Cengiz Lombardo Luigi 《Landslides》2022,19(6):1405-1420
On November 14, 2016, the northeastern South Island of New Zealand was hit by the magnitude Mw 7.8 Kaikōura earthquake, which is characterized by the most complex rupturing mechanism ever recorded. The widespread landslides triggered by the earthquake make this event a great case study to revisit our current knowledge of earthquake-triggered landslides in terms of factors controlling the spatial distribution of landslides and the rapid assessment of geographic areas affected by widespread landsliding. Although the spatial and size distributions of landslides have already been investigated in the literature, a polygon-based co-seismic landslide inventory with landslide size information is still not available as of June 2021. To address this issue and leverage this large landslide event, we mapped 14,233 landslides over a total area of approximately 14,000 km2. We also identified 101 landslide dams and shared them all via an open-access repository. We examined the spatial distribution of co-seismic landslides in relation to lithologic units and seismic and morphometric characteristics. We analyzed the size statistics of these landslides in a comparative manner, by using the five largest co-seismic landslide inventories ever mapped (i.e., Chi-Chi, Denali, Wenchuan, Haiti, and Gorkha). We compared our inventory with respect to these five ones to answer the question of whether the landslides triggered by the 2016 Kaikōura earthquake are less numerous and/or share size characteristics similar to those of other strong co-seismic landslide events. Our findings show that the spatial distribution of the Kaikōura landslide event is not significantly different from those belonging to other extreme landslide events, but the average landslide size generated by the Kaikōura earthquake is relatively larger compared to some other large earthquakes (i.e., Wenchuan and Gorkha).
相似文献5.
Ibeke S. M. Lomena Fadel Tour Everett K. Gibson Uel S. Clanton Arch M. Reid 《Meteoritics & planetary science》1976,11(1):51-57
Preliminary investigations have been made on two separate pieces from the Aïoun el Atrouss meteorite that fell on April 17, 1974 in southeast Mauritania. The major portion of the meteorite is a brecciated hypersthene achondrite with orthopyroxene (En74) as the major phase. Clasts of eucrite, up to 7 percent in volume within a single slice, occur within the hypersthene achondrite host. No evidence has been found of reaction between the two meteorite types, nor of the presence of any materials intermediate in composition. 相似文献
6.
Oswaldo Siga Leonardo Fadel Cury Ian McReath Ligia Maria de Almeida Leite Ribeiro Kei Sato Miguel Ângelo Stipp Basei Cláudia Regina Passarelli 《Gondwana Research》2011,19(1):260-274
The results of geological mapping, chemical analysis and radiometric dating of metabasic rocks of Betara Formation, and mapping and dating of those present in the Betara basement nucleus together with mylonitic granodiorite and syenogranite are reported here. U–Pb analysis of bulk zircon fractions from the metabasic rocks of the basement nucleus yielded a Statherian age of 1790 ± 22 Ma, while the metabasic rocks from the upper part of the Betara Formation yielded a Calymmian age between 1500 and 1450 Ma. This age is a minimum for the deposition of the Betara Formation. The older metabasic rocks are associated with post-tectonic, possibly anorogenic syenogranite, while the younger ones are gabbro or very porphyritic ankaramite whose REE patterns are consistent with crystallization from an N-MORB parent magma. The observations and data point to the probable events associated with extensional processes of the end of Paleoproterozoic and early Mesoproterozoic. Similar registers of Statherian (1.80–1.75 Ga) and Calymmian (1.50–1.45 Ga) extensional events are recorded in other parts of the South American and African continents. The Neoproterozoic witnessed the formation and junction of the tectonic slices which formed the Apiaí domain during the assemblage of western Gondwana. 相似文献
7.
The offshore east African rift system: new insights from the Sakalaves seamounts (Davie Ridge,SW Indian Ocean) 
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下载免费PDF全文 Simon Courgeon Patrick Bachèlery Gwénael Jouet Stephan J. Jorry Esther Bou Marcelle K. BouDagher‐Fadel Sidonie Révillon Gilbert Camoin Emmanuelle Poli 《地学学报》2018,30(5):380-388
The offshore branch of the East African Rift System (EARS) has developed during Late Cenozoic time along the eastern Africa continental margin. While Neogene–Pleistocene extensional tectonic deformation has been evidenced along the northern segment of the Davie Ridge, the spatial extent of deformation further south remains poorly documented. Based on recent and various oceanographic datasets (bathymetric surveys, dredge samples and seismic profiles), our study highlights active normal faulting, modern east–west extensional tectonic deformation and Late Cenozoic alkaline volcanism at the Sakalaves Seamounts (18°S, Davie Ridge) that seem tightly linked to the offshore EARS development. In parallel, rift‐related tectonic subsidence appears responsible for the drowning of the Sakalaves Miocene shallow‐water carbonate platform. Our findings bring new insights regarding the development of the EARS offshore branch and support recent kinematic models proposing the existence of a plate boundary across the Mozambique Channel. 相似文献
8.
A detailed analysis of the geometry of galaxies in clusters has been undertaken in both two and three dimensional space. The
procedure was applied to the three Abell clusters A1644, A548 E and A548 W. No significant alignment trend of galaxies in
clusters confirmed in three dimensional space was found. This result is consistent with the mixed dark matter model MDM of
galaxy formation. The result is also consistent with Peebles suggestion that protogalaxies acquired angular momentum from
tidal torques exerted by their neighbours in the early universe. The amount of angular momentum predicted by this mechanism
could be described by a single dimensionless papameter λ≈ 0.8. N-body experiments have shown that λ has approximately normal
distribution with mean value about 0.07 and with a standard deviation of about 0.03. From the analyic fit to flat rotation
curves it is found that tidal torque can provide the observed angular momentum if the mean collapse factor is about 20 and
the mean halo-to-disk mass ratio is of order 10. The MDM model does not predict any systematic relation between the tidal
torques among the halos of galaxies and the large scale structures such as the clusters, superclusters of galaxies and giant
voids in between. Further work in this area is still required.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
9.
A new empirical procedure is introduced to determine the confirmed galaxy members of a cluster. The method depends on both
the projected distances of galaxies in the cluster field from the cluster centre and their radial velocities. Galaxies of
the main body of the cluster are selected first, then the method works iteratively by increasing the standard values of the
relative radial distance and velocity until all galaxies belong to the cluster are included. The general apparent shape of
the cluster will result from the distribution of the celestial coordinates of the cluster members.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
10.
Empirical and analytical procedures are developed to determine the morphological properties of galaxy clusters. The apparent
orientations and shapes are obtainted in two dimensional space while the direction towards the cluster pole is found in three
dimensional space. These properties were determined for three Abell clusters and found to be strongly related.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献