نتایج جستجو برای: pyroclastic units
تعداد نتایج: 172732 فیلتر نتایج به سال:
The study area is located in the south of Qushadagh mountain range, in the north of Asbkhan village, Heris township. In terms of structural geology of Iran, this area is located in the main zone of Central Iran and Alborz-Azerbaijan sub-zone. The geological units of the region are including Eocene igneous and pyroclastic rocks with combination of andesitic, trachyandesitic, basaltic, tuffic and...
A 14 x 16 km diameter collapse Pacaya, and other composite cones are part of this caldera has been recognized 10 km south of volcanic front, while Amatitlan and many other Guatemala City, Guatemala. The caldera is north Central American silicic centers are north of the of the presently active volcano Pacaya and west of volcanic front [Rose et al., 1981]. Agua, a large stratovolcano. The caldera...
Validation and benchmarking of pyroclastic current (PC) models is required to evaluate their performance reliability for hazard assessment. Here, we present results a initiative built four commonly used assess concentrated PC hazard: SHALTOP, TITAN2D, VolcFlow, IMEX_SfloW2D. The benchmark focuses on the simulation channelized flows with similar source conditions over five different synthetic ch...
data envelopment analysis (dea) is a powerful tool for measuring relative efficiency of organizational units referred to as decision making units (dmus). in most cases dmus have network structures with internal linking activities. traditional dea models, however, consider dmus as black boxes with no regard to their linking activities and therefore do not provide decision makers with the reasons...
Introduction: While over 100 lunar pyroclastic deposits have been identified remotely [1], their compositions remain poorly constrained. In this work, we attempt to determine the compositions of three lunar pyroclastic deposits for which we have high-quality spectra: the Aristarchus Plateau, Mare Humorum, and Sulpicius Gallus [2]. The spectral behavior of lunar pyroclastic deposits is a combina...
-The chemical and the mineralogical composition of a group of pumiceous tufts associated with recent salic volcanic episodes from Tenerife (Canary Islands) have been studied. The investigation focused on the two main types of pyroclastic deposits of the zone: ash-flows and ash-falls. The samples can be classified chemically as trachytic and phonolitic rocks with an intermediate silica content a...
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