ABSTRACT. This paper presents results of a study conducted on laboratory and field in order to analyze the parameter amplitude of electromagnetic wave in qualitative assessment of soil moisture contents. We obtained empirical correlations between instantaneous amplitude of the wave, recorded by GPR -Ground Penetrating Radar, and the values of volumetric sediment moisture contents, obtained by TDR -Time Domain Reflectometer, in laboratory experiment as well as in soil samples in a field experiment. Results showed that there is a strong correlation between environmental moisture contents and instantaneous amplitude parameter of electromagnetic wave.In controlled laboratory conditions, this correlation showed a strong coefficient of determination. However, in the field experiment, the coefficient was only 0.64 due to the small amount of data used. This method is easy to implement through a processing flowchart of rapid execution, and can be used in addition to the velocity attribute usually employed in these correlations.
ABSTRACT. This paper presents results of seismic data from shallow seismic reflection onshore acquisition in the coastal plain of Bertioga (São Paulo State, Brazil) in order to support studies of its geological-geomorphological evolution. By using data from a CMP survey, we sought to analyze and interpret the record of three distinct events: reflected waves, refracted waves and surface waves. From the data processing, three sections were generated: stacked section of the reflected waves, tomographic section from the inversion of travel times of refracted P waves, and S-wave velocity section obtained from the inversion of dispersion curves of surface waves. The integration provided a detailed geological section with information about important contacts of quaternary units, surface of the basement rock and a geological structure that suggests a quaternary reactivation of an inferred fault.Keywords: seismic methods, coastal plain of Bertioga, quaternary deposits.
RESUMO.Este trabalho apresenta resultados da interpretação de dados obtidos em uma aquisição de sísmica de reflexão rasa onshore na planície costeira de Bertioga (São Paulo) visando subsidiar estudos da sua evolução geológica-geomorfológica. Utilizando-se dos dados de umúnico levantamento CMP, buscou-se analisar e interpretar o registro de três eventos distintos: ondas refletidas, ondas refratadas e ondas de superfície. Do processamento dos dados foram geradas: seção empilhada das ondas refletidas, seção tomográfica da inversão dos tempos de percurso das ondas P refratadas e seção de velocidades das ondas S, obtida a partir da inversão das curvas de dispersão das ondas de superfície. A integração forneceu uma seção geológica detalhada com informações de contatos importantes entre unidades quaternárias, superfície do embasamento rochoso, e estrutura que sugere reativação quaternária de falha inferida.Palavras-chave: métodos sísmicos, planície costeira de Bertioga, depósitos sedimentares quaternários.
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