Abstract

MONTALVO-ARRIETA, J. C. et al. Microzonation of the Linares, Northeast Mexico area, based on geology and shear-wave velocity measurements. Geofís. Intl [online]. 2005, vol.44, n.4, pp.331-340. ISSN 2954-436X.

We determined the velocity structure of S-wave (VS), P-wave (VP) and the average shear velocity to 30 meters depth (Vs30) at 30 locations in the Linares, Nuevo León area. V s and V P measurements were made from seismic refraction profiles. Four different lithologic units were defined in the upper 30 m: silts with 338 m/s and 221 m/s for V P and V s respectively, which correspond to the lowest velocities measured in the area; Quaternary deposits with 957 m/s and 559 m/s for VP and VS; Tertiary conglomerates with 2471 m/s and 1220 m/s for V P and Vs; and shales of the Upper Cretaceous Mendez Formation with 3195 m/s and 2149 m/s for V P and Vs. Sites of class C (Vs30 < 760 m/s) are dominant in the area, corresponding to maximum thicknesses of less than 16 m of soft sediments.

Keywords : Borehole data; travel time curves; seismic velocity structure; seismicity; site effects; seismic refraction profiles.

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