Structural study of Lunar Crater Volcanic Field (LCVF) through volcanic vent clusters analysis
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Volcanic fields pose a serious risk to human activities and settlements due to their high occurrence around the world and because of the type of eruptive activity that they exhibit. The need for new tools to better undertake volcanic hazard assessment for volcanic fields, especially from a spatial point of view, is the long-term aim of this work. The immediate goal is to determine whether there is a structural control on the occurrence of vent clusters within Lunar Crater Volcanic Field (LCVF), Nevada. For this purpose, Spatial Distribution Pattern (SDP) analysis confirmed whether vents within LCVF were clustered or randomly distributed. Structural analysis based on alignment recognition as determined by satellite images lead to the recognition of 3 main groups of alignments (Group 1, 2 and 3), whose structural or non-structural nature could be given with different grade of confidence. Group 1 and 2 seem to be related with the actual orientation of the regional stress field while for Group 3 this relationship is not obvious and there are also evidences for its non-tectonic meaning. Cluster analysis through hierarchical clustering and K-means clustering lead to the recognition of 9 main clusters that were used for a more detailed structural analysis within each single cluster. Group 1 occurrence has been assessed along with the occurrence of a new possible structural family (Group 4) not clearly marked in the global rose diagram. It is therefore proposed that the contemporaneous occurrence of this two Group (1 and 4) outlines a crustal situation within such areas that is more suitable for magma rising.