depth estimation of gravity anomalies by s-transform of analytic signal
نویسندگان
چکیده
the s-transform has widely been used in the analysis of non-stationary time series. a simple method to obtain depth estimates of gravity field sources is introduced in this study. we have developed a new method based on the spectral characteristics of downward continuation to estimate depth of structures. this calculation procedure is based on replacement of the fourier transform with the s-transform in traditional downward formula. we expect the localized estimation of the depth of anomalies using the s-transform spectrum rather than fft spectrum. likewise in the wavelets which don’t have a direct relationship with wave numbers, the s-transform corresponds to wave number instead of scale or pseudo wavenumber. this is the main advantage of using s-transform instead of wavelets. this advantage will lead to easier and more precise calculation of depth estimation. synthetic examples indicate the usefulness of this method. the method was applied to field examples producing reasonable results comparable to some common methods such as wavelet-based source characterization and euler deconvolution. it is possible to average the local spectra over the wavenumber axis that leads to the spectrum referenced to position axis. the depth of anomaly can be computed in any point of the profile by using localization of spectrum. thereby, we can analyze distinguished traces of shallow and deep anomalies while the lateral effects are also considered.
منابع مشابه
Depth estimation of gravity anomalies by S-transform of analytic signal
The S-transform has widely been used in the analysis of non-stationary time series. A simple method to obtain depth estimates of gravity field sources is introduced in this study. We have developed a new method based on the spectral characteristics of downward continuation to estimate depth of structures. This calculation procedure is based on replacement of the Fourier transform with the S-Tra...
متن کاملcombined analytic signal and euler method (an-eul) for depth estimation of gravity anomalies
the method expressed by salem and ravat. (2003) for depth estimation of magnetic sources is used on gravity anomalies for the first time. the depth of some rectangular prisms as synthetic models are estimated through the method. the gravity effect of these models is also considered with a relatively high value of random noise. a field example is also included and the depth of the main anomaly h...
متن کاملdepth and body type estimation of the magnetic anomalies using analytic signal and euler deconvolution.
a variety of semiautomatic methods, based on the use of derivatives of the magnetic anomalies, have been developed for the determination of both of the causative source parameters such as locations of boundaries and depths. one of these techniques is the method of the analytic signal for magnetic anomalies, which was initially used in its complex function form and makes use of the properties of...
متن کاملdepth estimation of gravity anomalies using hopfield neural networks
the method of artificial neural network is used as a suitable tool for intelligent interpretation of gravity data in this paper. we have designed a hopfield neural network to estimate the gravity source depth. the designed network was tested by both synthetic and real data. as real data, this artificial neural network was used to estimate the depth of a qanat (an underground channel) located at...
متن کاملFrequency Estimation Using Analytic Signal via Wavelet Transform
Frequency estimation of a sinusoid in white noise using maximum entropy power spectral estimation has been shown to be very sensitive to initial sinusoidal phase. This paper presents use of wavelet transform to find an analytic signal for frequency estimation using maximum entropy method (MEM) and compared the results with frequency estimation using analytic signal by Hilbert transform method a...
متن کاملa genre analytic study of research papers written by bilingual writers and their beliefs: a case of persian-english writers
تحقیق حاضر گزارشی است از تحلیل بخش مقدمه دو دسته از مقالات که عبارتند از: 11 مقاله از دو نویسنده دوزبانه فارسی زبان, که شامل مقدمه 4 مقاله به زبان انگلیسی و چاپ شده در مجلات بین المللی, مقدمه 3 مقاله به زبان انگلیسی و 4 مقاله به زبان فارسی چاپ شده در مجلات داخلی می شود؛ و 12 مقاله از محققان خارجی که در مجله applied linguistics به چاپ رسیده است. مبنای تئوری این تحلیل ها نظریه سوئلز (1990) یا هما...
15 صفحه اولمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
فیزیک زمین و فضاجلد ۴۱، شماره ۴، صفحات ۱۱۵-۱۲۴
کلمات کلیدی
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023