Vol 63, Núm. 2, 2011, P. 217-233.

Una aproximación a la regionalización sísmica del estado de Nuevo León, basada en velocidades de propagación de ondas de corte y evidencias geología

An approximation to the seismic regionalization in the state of Nuevo León, based on the propagation velocities of cutting waves and geological evidence

Juan Carlos Montalvo Arrieta1,*, Luis Gerardo Ramos Zúñiga1, Ignacio Navarro de León1 y Juan Alonso Ramírez Fernández1

1 Facultad de Ciencias de la Tierra, Universidad Autónoma de Nuevo León, Carretera a Cerro Prieto km 8, Ex–Hacienda de Guadalupe, 67000 Linares, Nuevo León.

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This paper presents the first seismic regionalization map for Nuevo Leon state, at a scale of 1:250 000. It was made using geological information and P and S wave propagation velocity data. Seismic refraction methodology was used to obtain the wave velocity propagation. A total of 708 profiles were made on different geologic units that are included in the Nuevo Leon state type–lithological column. Outcrops on which the profiles were carried out include sedimentary, igneous, and metamorphic rocks, and Quaternary deposits. The generation of the seismic site conditions map is based on site effect codes, as proposed by the National Earthquake Hazards Reduction Program (NEHRP, U.S.A.), from VS30 determination and its correlation with lithological information. The regionalization map using VS30, has revealed that A (VS30 > 1500 m/s), B (760 < VS30 ≤ 1500), and C (360 < VS30 ≤ 760) class sites predominate in the study area. Areas characterized by alluvial material show lower values of VS30 (560 m/sec), whereas consolidated rocks, for example, those that constitute the Mesozoic sequences, display high seismic wave velocity propagation values (VS30 = 1200 – 3500 m/s). The results obtained in this work provide a first approximation of the seismic response of shallow materials in the state, whose use is important in the land use planning, urban development and for the calculation of seismic risk and other geological perils, particularly for areas with historical evidence of seismic activity, but with little or no seismic instrumentation.

Keywords: Seismic refraction profiles, VS30, Northeast Mexico, seismic site effects, intraplate seismicity.