Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 2025

Powiadomienia systemowe

Sesja wygasła!
Sesja wygasła!

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: składowa resztkowa

Sortuj według:

Ogranicz wyniki do:

A comparative study on some regional and local - residual separation of gravity anomalies for synthetic example and a case study from Mekong River, Vietnam

Nguyen Hai, Nguyen Thanh, Dang Duy, To Loan

Inżynieria Mineralna

2025

Vol. 2, no. 1

art. no. 28

The division of anomalies into regional and local components is a critical and preliminary step when analyzing potential field data, including magnetic and gravity datasets. The regional component represents long-wavelength variations in the potential field associated with large-scale geophysical features, including crustal structures, tectonic boundaries, and density variations within the Earth's interior. Conversely, the residual component corresponds to shorter-wavelength variations linked to local geological structures or specific anomalies of interest. In Vietnam, researchers have employed various analytical methods such as the moving average (MA) and the quadratic least squares (QLS). However, due to the nonlinear and non-stationary nature of magnetic and gravity fields, these methods may not provide optimal solutions. In this study, we suggest a different method that utilizes bidimensional/image empirical mode decomposition (BEMD/iEMD) instead of Fourier and wavelet transforms. To assess the effectiveness of our method, we conducted validation using a gravitational anomaly model consisting of six spherical blocks, which yielded reliable results. Furthermore, we applied the MA, QLS, and iEMD methods to analyze Bouguer data from the Mekong River (in Vietnam), covering the region from the west of the Saigon River to the southwestern coastal area. Comparative analysis demonstrated that the iEMD method outperformed the MA and QLS methods as it allowed for simultaneous analysis of multiple local and regional components. This approach facilitated the generation of local maps and regional maps corresponding to the source field at various depths.