排序方式： 共有26条查询结果，搜索用时 15 毫秒
11.
Filippos Vallianatos Andriano Nardi Roberto Carluccio Massimo Chiappini 《Acta Geophysica》2012,60(3):894-909
The application of mechanical stress on a rock sample can induce electromagnetic emissions. Such emissions can be detected
experimentally and in principle could be used as precursors of the upcoming failure. 相似文献
12.
13.
14.
Geotechnical and Geological Engineering - The construction of twin tunnels is a mandatory guideline and a prevailing practice in either conventional or mechanized tunneling. Nevertheless, most of... 相似文献
15.
Michas Georgios Pavlou Kyriaki Avgerinou Sophia-Ekaterini Anyfadi Eleni-Apostolia Vallianatos Filippos 《Journal of Seismology》2022,26(2):201-225
Journal of Seismology - On March 3, 2021, a strong shallow earthquake of magnitude Mw 6.3 struck Northern Thessaly, an area that lies in one of the most active fault zones of mainland Greece. The... 相似文献
16.
Sea floor spreading anomalies in the Lofoten-Greenland basins reveal an unstable plate boundary characterized by several small-offset transforms for a period of 4 m.y. after opening. North of the Jan Mayen Fracture Zone, integrated analysis of magnetic and seismic data also document a distinct, persistent magnetic anomaly associated with the continent-ocean boundary and a locally, robust anomaly along the inner boundary of the break-up lavas. These results provide improved constraints on early opening plate reconstructions, which include a new anomaly 23-to-opening pole of rotation yielding more northerly relative motion vectors than previously recognized; and a solution of the enigmatic, azimuthal difference between the conjugate Eocene parts of the Greenland-Senja Fracture Zone if the Greenland Ridge is considered a continental sliver. The results confirm high, 2.36–2.40 cm yr–1, early opening spreading rates, and are consistent with the start of sea floor spreading during Chron 24r. The potential field data along the landward prolongations of the Bivrost Fracture Zone suggest that its location is determined by a Mesozoic transfer system which has acted as a first-order, across-margin tectono-magmatic boundary between the regional Jan Mayen and Greenland-Senja Fracture Zone systems, greatly influencing the pre-, syn- and post-breakup margin development. 相似文献
17.
18.
Landslide hazard zonation in high risk areas of Rethymno Prefecture,Crete Island,Greece 总被引：4，自引：1，他引：3
Maria Kouli Constantinos Loupasakis Pantelis Soupios Filippos Vallianatos 《Natural Hazards》2010,52(3):599-621
The central part of Rethymnon Prefecture, Crete Island, suffers from severe landslide phenomena because of its geological
and geomorphological settings alternated by the human activities. The main landslide preparatory and triggering causal factors
are considered to be the ground conditions (lithology), geomorphological processes (fluvial erosion, etc.), and the man-made
actions (excavations, loading etc.). The purpose of this study is to develop a decision support and continuous monitoring
system of the area by composing landslide hazard and risk maps. For that reason, several approaches of the weighted linear
combination (WLC), a semi-quantitative hazard analysis method, were adopted in a Geographic Information Systems (GIS) environment.
The results were validated using a pre-existing landslide database enriched with new landslide locations mapped through image
interpretation of a processed IKONOS satellite image. The validation results showed that the WLC method coupled with remote
sensing (RS) and GIS techniques can support engineering geological studies concerning landslide vulnerability of hazardous
areas. 相似文献
19.
Fault population statistics play a key role in the understanding of any statistical seismicity approach. In the present work
a non-extensive statistical physics approach is formulated and tested for the local fault length distribution. The approach
is composed of the following parts: (i) Tsallis entropy, S
q
, (ii) maximization of the Tsallis entropy under appropriate constrains, and (iii) derivation of the cumulative distribution
function (CDF) of the fault length population. This model is tested using fault length data from the Central Crete graben
in front of the Hellenic arc and estimated a thermodynamic q parameter equal to 1.16, which supports the conclusion that the fault system in Central Crete graben is a sub-extensive one. 相似文献
20.
Abstract— Post‐impact crater morphology and structure modifications due to sediment loading are analyzed in detail and exemplified in five well‐preserved impact craters: Mjølnir, Chesapeake Bay, Chicxulub, Montagnais, and Bosumtwi. The analysis demonstrates that the geometry and the structural and stratigraphic relations of post‐impact strata provide information about the amplitude, the spatial distribution, and the mode of post‐impact deformation. Reconstruction of the original morphology and structure for the Mjølnir, Chicxulub, and Bosumtwi craters demonstrates the long‐term subsidence and differential compaction that takes place between the crater and the outside platform region, and laterally within the crater structure. At Mjølnir, the central high developed as a prominent feature during post‐impact burial, the height of the peak ring was enhanced, and the cumulative throw on the rim faults was increased. The original Chicxulub crater exhibited considerably less prominent peak‐ring and inner‐ring/crater‐rim features than the present crater. The original relief of the peak ring was on the order of 420–570 m (currently 535–575 m); the relief on the inner ring/crater rim was 300–450 m (currently ?700 m). The original Bosumtwi crater exhibited a central uplift/high whose structural relief increased during burial (current height 101–110 m, in contrast to the original height of 85–110 m), whereas the surrounding western part of the annular trough was subdued more that the eastern part, exhibiting original depths of 43–68 m (currently 46 m) and 49–55 m (currently 50 m), respectively. Furthermore, a quantitative model for the porosity change caused by the Chesapeake Bay impact was developed utilizing the modeled density distribution. The model shows that, compared with the surrounding platform, the porosity increased immediately after impact up to 8.5% in the collapsed and brecciated crater center (currently +6% due to post‐impact compaction). In contrast, porosity decreased by 2–3% (currently ?3 to ?4.5% due to post‐impact compaction) in the peak‐ring region. The lateral variations in porosity at Chesapeake Bay crater are compatible with similar porosity variations at Mjølnir crater, and are considered to be responsible for the moderate Chesapeake Bay gravity signature (annular low of ?8 mGal instead of ?15 mGal). The analysis shows that the reconstructions and the long‐term alterations due to post‐impact burial are closely related to the impact‐disturbed target‐rock volume and a brecciated region of laterally varying thickness and depth‐varying physical properties. The study further shows that several crater morphological and structural parameters are prone to post‐impact burial modification and are either exaggerated or subdued during post‐impact burial. Preliminary correction factors are established based on the integrated reconstruction and post‐impact deformation analysis. The crater morphological and structural parameters, corrected from post‐impact loading and modification effects, can be used to better constrain cratering scaling law estimates and impact‐related consequences. 相似文献