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• W3043263916 abstract "&lt;p&gt;&lt;span&gt;Building on previous work aimed at identifying and characterizing the potential mechanical &lt;/span&gt;&lt;span&gt;trigger&lt;/span&gt;&lt;span&gt; controlling eruptions and destabilization at Piton de la Fournaise, we study the mechanical behavior of the &lt;/span&gt;&lt;span&gt;volcanic edifice&lt;/span&gt;&lt;span&gt; on a crustal scale. Do &lt;/span&gt;&lt;span&gt;the&lt;/span&gt; &lt;span&gt;recurrent &lt;/span&gt;&lt;span&gt;earthquake &lt;/span&gt;&lt;span&gt;pattern&lt;/span&gt;&lt;span&gt; correspond to a destabilization structure, precursor &lt;/span&gt;&lt;span&gt;of&lt;/span&gt;&lt;span&gt; a large-scale flank slid&lt;/span&gt;&lt;span&gt;ing&lt;/span&gt;&lt;span&gt;? &lt;/span&gt;&lt;span&gt;Or instead to a&lt;/span&gt;&lt;span&gt; reactivated &lt;/span&gt;&lt;span&gt;area of &lt;/span&gt;&lt;span&gt;magma storage (partially crystallized &amp;#8220;sill&amp;#8221;)? To answer these questions, we design numerical models which estimate the stress field associated with the volcanic complex. We use the ADELI finite element method in three dimensions, which handles&lt;/span&gt; &lt;span&gt; elasto-visco-plastic rheolog&lt;/span&gt;&lt;span&gt;ies&lt;/span&gt;&lt;span&gt;. In these models, we take into account 1) the topographic &lt;/span&gt;&lt;span&gt;load&lt;/span&gt;&lt;span&gt;, 2) the major density and resistance heterogeneities within the volcano obtained from previous studies, and 3) the &lt;/span&gt;&lt;span&gt;overpressure induced by the &lt;/span&gt;&lt;span&gt;in&lt;/span&gt;&lt;span&gt;tr&lt;/span&gt;&lt;span&gt;usion of a dike of arbitrary geometry.&lt;br&gt;The model&lt;/span&gt;&lt;span&gt;ed dike &lt;/span&gt;&lt;span&gt;injection generates deformation and stress fields such that their &lt;/span&gt;&lt;span&gt;isocontours&lt;/span&gt;&lt;span&gt; highlight an ellipsoidal cup structure &lt;/span&gt;&lt;span&gt;extending &lt;/span&gt;&lt;span&gt;from the central cone to a depth close to 0 and reaching the ends of the eastern flank. This zone could be assimilated to the zone of seismicity observed and described previously. &lt;/span&gt;&lt;span&gt;Toget&lt;/span&gt;&lt;span&gt;h&lt;/span&gt;&lt;span&gt;er with several systematic test cases, w&lt;/span&gt;&lt;span&gt;e will discuss the significance of these results, &lt;/span&gt;&lt;span&gt;such as whether&lt;/span&gt;&lt;span&gt; it &lt;/span&gt;&lt;span&gt;reveals&lt;/span&gt;&lt;span&gt; a rheological delimitation zone of the hydrothermalized &lt;/span&gt;&lt;span&gt;bed&lt;/span&gt;&lt;span&gt;rock, &lt;/span&gt;&lt;span&gt;resulting from&lt;/span&gt;&lt;span&gt; the combin&lt;/span&gt;&lt;span&gt;ed&lt;/span&gt;&lt;span&gt; influence of the topographic load and that of a magmatic injection.&lt;/span&gt;&lt;/p&gt;" @default.
• W3043263916 created "2020-07-23" @default.
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• W3043263916 date "2020-03-23" @default.
• W3043263916 modified "2023-09-26" @default.
• W3043263916 title "Piton de la Fournaise, elasto-plastic models of stresses and deformation accounting for the topographic load and a magmatic injection" @default.
• W3043263916 doi "https://doi.org/10.5194/egusphere-egu2020-11571" @default.
• W3043263916 hasPublicationYear "2020" @default.
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