Details
| Original language | English |
|---|---|
| Pages (from-to) | 123-128 |
| Number of pages | 6 |
| Journal | Journal of applied geophysics |
| Volume | 72 |
| Issue number | 2 |
| Early online date | 11 Aug 2010 |
| Publication status | Published - Oct 2010 |
| Externally published | Yes |
Abstract
We examine the nature of continental crust from the power law scaling behaviour of magnetic susceptibility and density variations. We analyze the data from the main hole of the German Continental Deep Drilling Program (KTB) using the Fast Fourier Transform (FFT) and the multitaper method. On the basis of depth-dependent behaviour of the calculated scaling exponents the KTB well can be divided into four zones of depth 0-0.8 km, 0.8-3.5 km, 3.5-7.7 km and 7.7-9.1 km which are also lithologically distinguishable. The scaling exponents for the susceptibility data correlate by 22-32% and 16-25% with the conversion log and the fracture density. In the case of density a correlation between the scaling exponent values and conversion log and the fracture density are found to be 19-45% and 44-66%, respectively. The multitaper method provides more reliable values of scaling exponents and calculated values are having higher correlation with the conversion log and fracture density than the FFT. The defined zones 3 and 4 are having lower values of scaling exponents and higher values of fractal dimension than the shallower sections. This observation indicates an increase of crustal heterogeneity in terms of fault or fracture density.
Keywords
- Density, Fractal, German Continental Deep Drilling Program (KTB), Magnetic susceptibility, Scaling exponent
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
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In: Journal of applied geophysics, Vol. 72, No. 2, 10.2010, p. 123-128.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Power law distribution of susceptibility and density and its relation to seismic properties
T2 - An example from the German Continental Deep Drilling Program (KTB)
AU - Bansal, A. R.
AU - Gabriel, G.
AU - Dimri, V. P.
N1 - Funding Information: We are thankful to the Council of Scientific and Industrial Research (CSIR), New Delhi , and the International Bureau of BMBF, Project Management Agency DLR, Germany , for financial support . We are thankful to Mark Pilkington, M. Fedi, T. Beilecke for useful discussion and Klaus Holliger (Editor- in-Chief), John A. Goff, and an anonymous reviewer for constructive criticism and thoughtful suggestions for improving the manuscript. ARB is thankful to the Director, NGRI for granting permission for publishing this paper.
PY - 2010/10
Y1 - 2010/10
N2 - We examine the nature of continental crust from the power law scaling behaviour of magnetic susceptibility and density variations. We analyze the data from the main hole of the German Continental Deep Drilling Program (KTB) using the Fast Fourier Transform (FFT) and the multitaper method. On the basis of depth-dependent behaviour of the calculated scaling exponents the KTB well can be divided into four zones of depth 0-0.8 km, 0.8-3.5 km, 3.5-7.7 km and 7.7-9.1 km which are also lithologically distinguishable. The scaling exponents for the susceptibility data correlate by 22-32% and 16-25% with the conversion log and the fracture density. In the case of density a correlation between the scaling exponent values and conversion log and the fracture density are found to be 19-45% and 44-66%, respectively. The multitaper method provides more reliable values of scaling exponents and calculated values are having higher correlation with the conversion log and fracture density than the FFT. The defined zones 3 and 4 are having lower values of scaling exponents and higher values of fractal dimension than the shallower sections. This observation indicates an increase of crustal heterogeneity in terms of fault or fracture density.
AB - We examine the nature of continental crust from the power law scaling behaviour of magnetic susceptibility and density variations. We analyze the data from the main hole of the German Continental Deep Drilling Program (KTB) using the Fast Fourier Transform (FFT) and the multitaper method. On the basis of depth-dependent behaviour of the calculated scaling exponents the KTB well can be divided into four zones of depth 0-0.8 km, 0.8-3.5 km, 3.5-7.7 km and 7.7-9.1 km which are also lithologically distinguishable. The scaling exponents for the susceptibility data correlate by 22-32% and 16-25% with the conversion log and the fracture density. In the case of density a correlation between the scaling exponent values and conversion log and the fracture density are found to be 19-45% and 44-66%, respectively. The multitaper method provides more reliable values of scaling exponents and calculated values are having higher correlation with the conversion log and fracture density than the FFT. The defined zones 3 and 4 are having lower values of scaling exponents and higher values of fractal dimension than the shallower sections. This observation indicates an increase of crustal heterogeneity in terms of fault or fracture density.
KW - Density
KW - Fractal
KW - German Continental Deep Drilling Program (KTB)
KW - Magnetic susceptibility
KW - Scaling exponent
UR - http://www.scopus.com/inward/record.url?scp=77957751585&partnerID=8YFLogxK
U2 - 10.1016/j.jappgeo.2010.08.001
DO - 10.1016/j.jappgeo.2010.08.001
M3 - Article
AN - SCOPUS:77957751585
VL - 72
SP - 123
EP - 128
JO - Journal of applied geophysics
JF - Journal of applied geophysics
SN - 0926-9851
IS - 2
ER -