2018_EJRNL_PP_ANIMESH_MANDAL_1.pdf
Terbatas  
» Gedung UPT Perpustakaan
Terbatas  
» Gedung UPT Perpustakaan
Adequate separation of regional-residual components from observed gravity anomaly is always a challenging
task in gravity interpretation. Several techniques have been developed for effective regional-residual separation,
however, no single approach can perfectly accomplish the job. In thiswork, a hybrid approach has been proposed
with an objective to enhance the performance of Bi-dimensional Empirical Mode Decomposition (BEMD) in
decomposing gravity anomaly by jointly employing low pass filter and BEMD. The paper discusses the efficacy
of this hybrid approach in gravity anomaly separation from noisy synthetic and field data. Synthetic studies
involving forward modelling of asymmetrically placed shallow and deeper spherical bodies with added Gaussian
noises of different levels demonstrate that the proposed approach ismore efficient in separating the regional-residual
components fromobserved gravity anomaly compared to the individual application of filtering or BEMD. It
has an added advantage of suppressing the unwanted noises significantly. After successful test with synthetic
data the proposed approach has been applied to field data and satisfactory results are obtained. Thus, the proposed
hybrid approach ismore effective in delineating gravity signature related to complex near surface features
even from noisy gravity data.