Experimental insights into factors influencing Vp/Vs ratios at the Nevado del Ruiz Volcano, Colombia

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Joaquin Pablo Aguilera Bustos
Ludmila Adam


Measurements of ultrasonic elastic waves were carried out at atmospheric and in-situ pressure conditions on rock samples from Nevado del Ruiz Volcano (NRV).  The study focuses on Vp/Vs as a function of  Vp as indicators of mineralogy, porosity, fluid-types and anisotropy. We find that Vp/Vs can separate the effect of microcracks vs. vesicles as a function of fluid type and effective pressures. Little-to-no pressure dependence in Vp/Vs suggest that the rock porosity is mainly comprised by vesicles, while largely varying Vp/Vs vs Vp is associated to cracks. This effect occurs under both, dry and fluid saturation conditions. When cracks close, the Vp/Vs values are representative of the rock mineralogy. Finally, as foliation results in a wide range of Vp/Vs, which could lead to misinterpretations. For instance, on NRV foliated rocks, Vp/Vs at dry conditions and parallel to the foliation plane ranges at values which are commonly associated to fluid saturation.


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Aguilera Bustos, J. P. and Adam, L. (2023) “Experimental insights into factors influencing Vp/Vs ratios at the Nevado del Ruiz Volcano, Colombia”, Volcanica, 6(2), pp. 283–299. doi: 10.30909/vol.06.02.283299.
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Received 2023-02-08
Accepted 2023-07-12
Published 2023-08-24
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