The analysis of a variety of geologic and geophysical data indicates that significant lateral variations in crustal structure exist across the large aperture seismic array (LASA). This structural complexity is inferred from observation of Rayleigh-wave dispersion, body-wave spectral ratios, P-wave amplitude and travel-time anomalies, seismic refraction profiles, and gravity and magnetic anomalies. To explain these results, we divide LASA into an eastern and a western sector. An attempt is then made to explain the observations in each sector in terms of crustal models consisting of three to five distinct layers. The observations show that the maximum lateral change in structure across LASA takes place in a NE-SW direction.
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Glover et al. (1969) studied this question.