The use of the D+ solution in magnetotelluric interpretation

Beamish, D.; Travassos, J.M.. 1992 The use of the D+ solution in magnetotelluric interpretation. Journal of Applied Geophysics, 29 (1). 1-19.

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The MT interpretation procedure begins with a set of sounding data in the frequency domain. The overall quality of these data can be variable both as a function of frequency and location. Many simple interpretation procedures, such as the assessment of static distortion, act directly on the sounding data. A number of response characteristics, such as the location (in frequency ) and number of turning points, are important to the interpretation. Localised scatter ( noise ) in the response estimates can produce false gradients which degrade the quality of the inferences made from the data. This study considers how the o+ solution can be used to process the raw sounding data to provide a number of interpre­ tational advantages. Although the o+ solution has strict formal roots in I D inverse theory, it is used here simply to en­ hance those data attributes, particularly that of physical validity, which lead to a more meaningful assessment of data characteristics. The data considered are 84 broadband array soundings from the Parami basin, Brazil. The advantages provided by the o+ processed data set are demonstrated by using the raw and processed data in two main interpretational procedures. The first procedure concerns the ability of the data to provide quantitative assessments of the influence of static distortion. The second procedure concerns the application of transform methods which attempt to recover a resistiv­ ity I depth or reflectivity profile directly from the sounding data.

Item Type: Publication - Article
Digital Object Identifier (DOI):
NORA Subject Terms: Earth Sciences
Date made live: 24 Jun 2014 14:19 +0 (UTC)

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