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Hydrothermal fluid flow: Temperature along the subduction thrust and implications for deformation

Invita DIV. CIENCIAS DE LA TIERRA
Fecha 2018-06-15, 13:30:00 hrs
Lugar: Audiovisual de Ciencias de la Tierra
Ponente(s): Prof. Robert Harris
Professor at College of Earth, Ocean, and Atmospheric
Sciences, Oregon State University
Resumen:  At subduction zones, temperature along the subduction thrust influences the frictional transition between velocity strengthening and velocity weakening. In this talk I summarize evidence for hydrothermal circulation on the incoming plate and how it influences the thermal regime along the subduction thrust by drawing on examples from the Nankai Trough, Japan and Middle America trench, Costa Rica. Although the underlying mechanisms between temperature and the onset of seismicity remain unknown I review several hypotheses within the context of rate and state friction and discount some of them. I conclude with a discussion of thermal models of subduction along the southern Mexican margin and the need for comprehensive heat flow data to better understand hydrothermal circulation and the thermal state of the incoming Cocos plate.

Semblanza: Prof. Robert Harris Robert is interested in using thermal processes to understand the Earth. All geologic processes involve the transfer of energy. Heat (energy) and temperature are fundamental to many earth processes, and quantifying the flow of energy and thermal budgets leads to an appreciation and understanding of Earth dynamics. These interests have led him along three paths: Marine Heat and Fluid Flow, Climate change inferred from borehole temperature-depth profiles and Temperature and rheology.

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