Microgravity surveys in urban areas require very careful data acquisition and processing. Being typical anomalies of low amplitude, enhanced and stable methods of filtering and interpretation are needed to preserve the source-related information content. A microgravity survey was carried out in the town of Cardito, Italy, along a profile crossing a known cavity. On these data we tested the procedures of local filtering, based on the wavelet transform, and of stable interpretation, based on multiscale methods. To compute the Bouguer anomaly we had particular care in the removal of gravity effects of the buildings close to the measurement stations. The buildings were modelled in detail by using prismatic models. A local filtering based on the Discrete Wavelet Transform (DWT) was used to denoise the data near the cavity and proved to be more effective than classic wavenumber filtering in the Fourier domain, not altering significantly the gradients of the anomaly. Multiscale methods conjugate stability and resolution in an optimal way. High resolution methods, such as the Multiridge Euler Deconvolution and the Depth from Extreme Points (DEXP) yield consistent results about the depth and the shape of the source, in good agreement with the actual location and shape of the cavity.
Enhanced methods to interpret microgravity anomalies in urban areas / Castiello, G.; Florio, Giovanni; Grimaldi, Marino; Fedi, Maurizio. - In: FIRST BREAK. - ISSN 0263-5046. - STAMPA. - 28:8(2010), pp. 93-98.
Enhanced methods to interpret microgravity anomalies in urban areas
FLORIO, GIOVANNI;GRIMALDI, MARINO;FEDI, MAURIZIO
2010
Abstract
Microgravity surveys in urban areas require very careful data acquisition and processing. Being typical anomalies of low amplitude, enhanced and stable methods of filtering and interpretation are needed to preserve the source-related information content. A microgravity survey was carried out in the town of Cardito, Italy, along a profile crossing a known cavity. On these data we tested the procedures of local filtering, based on the wavelet transform, and of stable interpretation, based on multiscale methods. To compute the Bouguer anomaly we had particular care in the removal of gravity effects of the buildings close to the measurement stations. The buildings were modelled in detail by using prismatic models. A local filtering based on the Discrete Wavelet Transform (DWT) was used to denoise the data near the cavity and proved to be more effective than classic wavenumber filtering in the Fourier domain, not altering significantly the gradients of the anomaly. Multiscale methods conjugate stability and resolution in an optimal way. High resolution methods, such as the Multiridge Euler Deconvolution and the Depth from Extreme Points (DEXP) yield consistent results about the depth and the shape of the source, in good agreement with the actual location and shape of the cavity.File | Dimensione | Formato | |
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