Source field effects on transfer functions at mid-latitudes

Beamish, D.. 1979 Source field effects on transfer functions at mid-latitudes. Geophysical Journal International, 58 (1). 117-134. https://doi.org/10.1111/j.1365-246X.1979.tb01013.x

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Abstract/Summary

Transfer function estimates are required to provide information regarding the lateral variation of conductivity structure within the Earth. Conventional techniques assume that the effect of external field characteristics on transfer function estimates can be removed by a least-squares procedure. This assumption is examined at three mid-latitude stations. It is found that, at all three stations, source field characteristics do affect the transfer function estimates. The source field effects increase with both latitude and period. The source field contribution is minimized by the determination of the transfer function from a weighted mean of estimates of transfer functions obtained from individual records. The weighting function is the vertical field partial coherence and it is, furthermore, necessary to provide a wide distribution of this parameter if a valid transfer function estimate is to be obtained.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1111/j.1365-246X.1979.tb01013.x
Programmes:	BGS Programmes > Seismology and Geomagnetism
ISSN:	0956-540X
NORA Subject Terms:	Earth Sciences
Date made live:	15 Jun 2022 10:05 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/532737

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1111/j.1365-246X.1979.tb01013.x

Programmes:

BGS Programmes > Seismology and Geomagnetism

ISSN:

0956-540X

NORA Subject Terms:

Earth Sciences

Date made live:

15 Jun 2022 10:05 +0 (UTC)