caa a22 4500 47581326X CHVBK 20180406123803.0 cr unu---uuuuu 170329e20000901xx s 000 0 eng 10.1007/PL00001128 doi (NATIONALLICENCE)springer-10.1007/PL00001128 Microtremors as a Geophysical Exploration Tool: Applications and Limitations [Elektronische Daten] [J. Delgado, C. López Casado, J. Giner, A. Estévez, A. Cuenca, S. Molina] —The usefulness of microtremors as a geophysical exploration tool has been analyzed. This application is possible due to the relationship between the main resonance frequency of a given soil, obtained from the H/V spectral ratios of microtremors, its thickness and average shear velocity. We first measured the ambient noise at 33 sites and determined their main resonance frequency. Detailed geotechnical information was available for 23 of the sites, thereby allowing us to establish a quantitative relationship between the resonance frequency and the thickness of the soil, and indirectly between either of them and the shear velocity of the soil. The practical application of this relationship has revealed its usefulness in determining the surface structure of a valley with excellent accuracy, with an error of only 15% in the depths calculated. These errors are due to the simplification of the problem that this method implies: it requires that the shear velocity vary constantly with depth throughout the study region, which is evidently not always so, and that the input data themselves intrinsically have a certain degree of uncertainty. This method is therefore not valid when there is no mechanical contrast between the study soil and the underlying layer or when the shear velocity varies irregularly with depth in the study area. Birkhäuser Verlag Basel,, 2000 Key Words: Frequency of resonance, geophysical exploration, H/V ratios, microtremors, soil thickness nationallicence Delgado J. Dpt. Ciencias de la Tierra, Universidad de Alicante, Ap. Correos 99, E-03080, Alicante, Spain. E-mail: jose.delgado@ua.es, ES aut López Casado C. Dpt. Fıásica Teórica y del Cosmos, Facultad de Ciencias, Universidad de Granada, Granada, Spain. E-mail: clcasado@goliat.ugr.es, ES aut Giner J. Dpt. Ciencias de la Tierra, Universidad de Alicante, Ap. Correos 99, E-03080, Alicante, Spain. E-mail: jose.delgado@ua.es, ES aut Estévez A. Dpt. Ciencias de la Tierra, Universidad de Alicante, Ap. Correos 99, E-03080, Alicante, Spain. E-mail: jose.delgado@ua.es, ES aut Cuenca A. COPUT, Dirección de Carreteras, Ctra, Ocaña s/n, Alicante, Spain., ES aut Molina S. Dpt. Ciencias de la Tierra, Universidad de Alicante, Ap. Correos 99, E-03080, Alicante, Spain. E-mail: jose.delgado@ua.es, ES aut https://doi.org/10.1007/PL00001128 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/PL00001128 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Delgado J. Dpt. Ciencias de la Tierra, Universidad de Alicante, Ap. Correos 99, E-03080, Alicante, Spain. E-mail: jose.delgado@ua.es, ES aut NATIONALLICENCE 700 1- López Casado C. Dpt. Fıásica Teórica y del Cosmos, Facultad de Ciencias, Universidad de Granada, Granada, Spain. E-mail: clcasado@goliat.ugr.es, ES aut NATIONALLICENCE 700 1- Giner J. Dpt. Ciencias de la Tierra, Universidad de Alicante, Ap. Correos 99, E-03080, Alicante, Spain. E-mail: jose.delgado@ua.es, ES aut NATIONALLICENCE 700 1- Estévez A. Dpt. Ciencias de la Tierra, Universidad de Alicante, Ap. Correos 99, E-03080, Alicante, Spain. E-mail: jose.delgado@ua.es, ES aut NATIONALLICENCE 700 1- Cuenca A. COPUT, Dirección de Carreteras, Ctra, Ocaña s/n, Alicante, Spain., ES aut NATIONALLICENCE 700 1- Molina S. Dpt. Ciencias de la Tierra, Universidad de Alicante, Ap. Correos 99, E-03080, Alicante, Spain. E-mail: jose.delgado@ua.es, ES aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer