Volcanotectonic interactions between inclined sheets, dykes, and faults at the Santorini Volcano, Greece

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dc.article.number107294
dc.catalogadorjca
dc.contributor.authorDrymoni, Kyriaki
dc.contributor.authorBrowning, John
dc.contributor.authorGudmundsson, Agust
dc.date.accessioned2024-06-06T14:28:08Z
dc.date.available2024-06-06T14:28:08Z
dc.date.issued2021
dc.description.abstractDykes and inclined sheets are known occasionally to exploit faults as parts of their paths, but the conditions that allow this to happen are still not fully understood. In this paper, we report field observations from a swarm composed of 91 segments of dykes and inclined sheets, the swarm being particularly well-exposed in the mechanically layered caldera walls of the Santorini volcano, Greece. Here the focus is on dykes and sheets in the swarm that are seen deflected into faults and the mechanical conditions that encourage such deflections. In particular, we present new analytical and numerical models to explain the mechanical principles of dyke/sheet deflections into faults. The numerical models are applied to a normal-fault dipping 65° with a damage zone composed of parallel layers or zones of progressively stiffer rocks with increasing distance from the fault rupture plane. We model a sheet-intrusion, dipping from 0° to 90° and with an overpressure of alternatively 1 MPa and 5 MPa, approaching the fault. We further tested the effects of changing (1) the thickness of the sheet-intrusion, (2) the fault-zone thickness, (3) the fault-zone dip-dimension (height), and (4) the loading by, alternatively, regional tension and compression. We find that the stiffness of the fault core, where a compliant core characterises recently active fault zones, has pronounced effects on the orientation and magnitudes of the local stresses and, thereby, on the likelihood of dyke/sheet deflection into the fault zone. Similarly, the analytical models, focusing on the fault-zone tensile strength and energy conditions for dyke/sheet deflection, indicate that dykes/sheets are most likely to be deflected into and use steeply dipping recently active (zero tensile-strength) normal faults as parts of their paths.
dc.fuente.origenORCID
dc.identifier.doi10.1016/j.jvolgeores.2021.107294
dc.identifier.issn0377-0273
dc.identifier.urihttps://doi.org/10.1016/j.jvolgeores.2021.107294
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0377027321001232?via%3Dihub
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/86502
dc.information.autorucEscuela de Ingeniería; Browning , John; 0000-0001-8022-6234; 1081089
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final15
dc.pagina.inicio1
dc.revistaJournal of Volcanology and Geothermal Research
dc.rightsacceso restringido
dc.subjectDykesInclined sheets
dc.subjectFaults
dc.subjectDyke deflection
dc.subjectSheet deflection
dc.subjectAnalytical models
dc.subjectNumerical models
dc.subjectSantorini Greece
dc.subject.ddc550
dc.subject.deweyCiencias de la tierraes_ES
dc.titleVolcanotectonic interactions between inclined sheets, dykes, and faults at the Santorini Volcano, Greece
dc.typeartículo
dc.volumen416
sipa.codpersvinculados1081089
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