级联分样与分频段功率谱计算的大地电磁张量阻抗估算对比

doi:10.11720/wtyht.2018.1.23

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Abstract

Cascade and sub-band frequency spectrum calculation are two power spectrum calculation methods in magnetotelluric data processing. This paper is based on Welch power spectrum calculation method, and sets the processing parameters under the same conditions, so as to use two spectrum calculation methods to estimate magnetotelluric impedance with simulated data and field data respectively. The results show that, for both the apparent resistivity and the impedance phase, the two power spectrum calculation methods obtain nearly the same results for the simulated data and the field data; nevertheless, the sounding curve with sub-band frequency spectrum calculation method is more continuous and more reasonable than that with cascade method at lower frequency, while at high frequency, the cascade method can get slightly better curves than sub-band frequency spectrum calculation.

Key words： cascade sub-band frequency spectrum calculation magnetotelluric tensor impedance

Received: 20 January 2017 Published: 20 February 2018

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	Gang ZHANG
	Xian-Guo TUO
	Xu-Ben WANG
	Huai-Liang LI

Cite this article:

Gang ZHANG,Xian-Guo TUO,Xu-Ben WANG, et al. A comparison of magnetotelluric impedance estimation effects with cascade and sub-band frequency spectrum calculation methods[J]. Geophysical and Geochemical Exploration, 2018, 42(1): 185-191.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2018.1.23 OR https://www.wutanyuhuatan.com/EN/Y2018/V42/I1/185

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