Abstract
We evaluate the subsoil conditions at La Reforma caldera, located inside the Tres Virgenes Volcanic Complex in Baja California Sur, Mexico, using the Horizontal to Vertical Spectral Ratios (HVSR) method. The spatial distribution of the dominant frequencies has a complex pattern, which could be related to the heterogeneities of the zone. There is a good correlation between the inverted velocity models and the caldera lithology proposed in early studies. Our results show significant contrast between VP and VS, resulting in high VP/VS ratios. These high VP/VS ratios suggest a water-saturated material and define a possible water central pathway in La Reforma caldera. The VP/VS values obtained for La Reforma caldera are different from those found in the rest of the Tres Virgenes volcanic complex.
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