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Space-frequency analysis and reduction of potential field ambiguity
- Source :
- Annals of Geophysics, Vol 40, Iss 5 (1997)
- Publication Year :
- 1997
-
Abstract
- Ambiguity of depth estimation of magnetic sources via spectral analysis can be reduced representing its field via a set of space-frequency atoms. This is obtained throughout a continuous wavelet transform using a Morlet analyzing wavelet. In the phase-plane representation even a weak contribution related to deep-seated sources is clearly distinguished with respect a more intense effect of a shallow source, also in the presence of a strong noise. Furthermore, a new concept of local power spectrum allows the depth to both the sources to be correctly interpreted. Neither result can be provided by standard Fourier analysis. Another method is proposed to reduce ambiguity by inversion of potential field data lying along the vertical axis. This method allows a depth resolution to gravity or the magnetic methods and below some conditions helps to reduce their inherent ambiguity. Unlike the case of monopoles, inversion of a vertical profile of gravity data above a cubic source gives correct results for the cube side and density.
- Subjects :
- potential field anomaly
media_common.quotation_subject
potential field
Geometry
lcsh:QC851-999
law.invention
symbols.namesake
Wavelet
law
wavelet
wavelet transform
Continuous wavelet transform
interpretation
Mathematics
media_common
Frequency analysis
Mathematical analysis
lcsh:QC801-809
Potential field
Spectral density
Inversion (meteorology)
Ambiguity
lcsh:Geophysics. Cosmic physics
Geophysics
Fourier analysis
symbols
lcsh:Meteorology. Climatology
data processing
magnetic source
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Annals of Geophysics, Vol 40, Iss 5 (1997)
- Accession number :
- edsair.doi.dedup.....809977f2aec417dcec4be18f60135593