Determination of the spectral relationship in seismological stations located in the Paraná, Chaco-Paraná, and Pantanal basins
DOI:
https://doi.org/10.24215/10.24215/18527744e003Keywords:
HVSR, fundamental frequency, site effect, seismic noise, sedimentary basinsAbstract
Ambient noise data from 45 stations of the BRASIS network were analyzed, and the spectral ratio between horizontal and vertical amplitudes as a function of frequency was calculated, allowing site effects to be analyzed. The H/V curves were obtained using the Nakamura technique, which enables the evaluation of soil characteristics. This study allows us to improve the resolution of shallow structures in the region's models, showing a better spatial correlation with known tectonic features. By analyzing these curves, information was obtained on the contact between the basement and the underlying sedimentary basin, and for some stations, a shallower contrast was observed. In general, for stations located on the basins, lower fundamental frequency values were obtained, while for stations located at the basin edges, the frequencies showed high values indicative of firm rock. In the stations located in the Chaco-Paraná basin, the fundamental frequency was determined, representing the response to the contact between the basin and the basement, and a second contrast was observed, possibly linked to a volcanic stratum from the Upper Jurassic-Middle Cretaceous at a depth of 550 meters. In the Pantanal basin, the fundamental frequency presented a similar value. Additionally, two impedance contrasts were observed, the most superficial linked to the interface between an Aeolian deposit from the Pleistocene-Holocene, and an older unit associated with lateral migration channels. These results represent a progress in the seismological knowledge of the Chaco-Paraná, Paraná, and Pantanal basins.
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References
Assine, M. L. y Soares, P. C. (2004). Quaternary of the Pantanal, west-central Brazil. Quaternary International, 114(1), 23-34. https://doi.org/10.1016/S1040-6182(03)00039-9
Chatelain, J. L. y Guillier, B. (2013). Reliable fundamental frequencies of soils and buildings down to 0.1 Hz obtained from ambient vibration recordings with a 4.5 Hz sensor. Seismological Research Letters, 84(2), 199-209. https://doi.org/10.1785/0220120003
da Silveira, A. L. A., Amorim, G. M. e., Pessi, D. D., da Silva, N. M., Mioto, C. L., Rodrigues, A. G. S., Pedrozo Júnior, V. R., Paranhos Filho, A. C. y Machado, R. (2021). Evaluation of the depth of the Pantanal sedimentary basin based on seismic events. Research, Society and Development, 10(9), e57710918243. https://doi.org/10.33448/rsd-v10i9.18243
Kamarudin, A. F., Daud, M. E., Ibrahim, Z. y Ibrahim, A. (2015). Part 2: case studies – evaluation of site fundamental frequency and ground characterization on rock and sedimentary sites using HVRS method. International Journal of Applied Engineering Research, 10(81), 72-76.
Kanai, K. y Tanaka, T. (1961). On microtremors. Bulletin of the Earthquake Research Institute, 39, 97-114.
Konno, K. y Ohmachi, T. (1998). Ground-motion characteristics estimated from spectral ratio between horizontal and vertical components of microtremor. Bulletin of the Seismological Society of America, 88(1), 228-241. https://doi.org/10.1785/bssa0880010228
Lachet, C. y Bard, P. Y. (1994). Numerical and theoretical investigations on the possibilities and limitations of Nakamura’s technique. Journal of Physics of the Earth, 42(5), 377-397. https://doi.org/10.4294/jpe1952.42.377
Macau, A., Benjumea, B., Gabàs, A., Figueras, S. y Vilà, M. (2015). The effect of shallow quaternary deposits on the shape of the H/V spectral ratio. Surveys in Geophysics, 36(1), 185-208. https://doi.org/10.1007/s10712-014-9305-z
Marcellini, A. (2006). Guidelines for the implementation of the H/V spectral ratio technique on ambient vibrations [informe técnico]. SESAME European Research Project.
McNamara, D. E. y Boaz, R. I. (2019). Visualization of the seismic ambient noise spectrum. En N. Nakata, L. Gualtieri y A. Fichtner (Eds.), Seismic ambient noise (pp. 1-29). Cambridge University Press. https://doi.org/10.1017/9781108264808.003
Mucciarelli, M., Herak, M. y Cassidy, J. (2007). Increasing seismic safety by combining engineering technologies and seismological data. Springer.
Nakamura, Y. (1989). A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface. Quarterly Report of Railway Technical Research, 30(1), 25-33.
Nakamura, Y. (30 de enero al 4 de febrero de 2000). Clear identification of fundamental idea of Nakamura’s technique and its applications [ponencia]. The 12th World Conference on Earthquake Engineering. Auckland, New Zealand.
Nogoshi, M. y Igarashi, T. (1971). On the amplitude characteristics of microtremor (Part 2). Journal of the Seismological Society of Japan, 24, 26-40.
Ritta, R. J., Suárez, L. E. y Pando, M. A. (2012). Determinación del perı́odo fundamental del suelo usando vibración ambiental y el cociente espectral horizontal/vertical. Mecánica Computacional, 31(8), 1399-1419.
Rocha, M. P., Assumpção, M., Affonso, G. M. P. C., Azevedo, P. A. y Bianchi, M. (2019). Teleseismic P wave tomography beneath the Pantanal, Paraná, and Chaco-Paraná basins, SE South America: Delimiting lithospheric blocks of the SW Gondwana assemblage. Journal of Geophysical Research: Solid Earth, 124(7), 7120-7137. https://doi.org /10.1029/2018JB016807
Rodríguez-Marek, A. R., Bray, J. D. y Abrahamson, N. A. (2009). An empirical geotechnical seismic site response procedure. En M. Mucciarelli, M. Herak y J. Cassidy (Eds.), Technologies and seismological data (pp. 353-380). Springer. https://doi.org/10.1007/978-1-4020-9196-4_24
Shinoda, M., Watanabe, K., Kojima, K. y Tateyama, M. (2009). Outline of performance-based design for railway earth structure in Japan. En T. Kokusho, H. Tsukamoto y B. Yoshida (Eds.), Performance based design in earthquake geotechnical engineering: From case history to practice (pp. 137-148). CRC Press.
Taioli, F., Dos Santos, M. G. M., Assine, M. L. y Mendes, D. (2021). How ground penetrating radar helps to understand the Nhecolândia lakes landscape in the Brazilian Pantanal wetland. Brazilian Journal of Geology, 51(2), 1-11. https://doi.org/10.1590/2317-4889202120200021
Torra, R. (2005). The Chaco Paraná basin rift basin system. An approach to the tectonic-stratigraphical evolution from the late Cretaceous to Quaternary, South America. Ciência e Natura, 27(2), 25-64.
Wathelet, M., Chatelain, J. L., Cornou, C., Di Giulio, G., Guillier, B., Ohrnberger, M. y Savvaidis, A. (2020). Geopsy: A user-friendly open-source tool set for ambient vibration processing. Seismological Research Letters, 91(3), 1878-1889. https://doi.org/10.1785/0220190360
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