LATERAL VARIATIONS IN CRUSTAL STRUCTURE BENEATH THE MONTANA LASA
Seismic data lab rept.
TELEDYNE INDUSTRIES INC ALEXANDRIA VA EARTH SCIENCES DIV
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The analysis of a variety of geologic and geophysical data indicates that significant lateral variations in crustal structure exist across 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, LASA is divided into an eastern and a western sector. An attempt is made to explain the observations in each sector in terms of crustal models consisting of 3 to 5 distinct layers. The observations show that the maximum lateral change in structure across LASA takes place in a NE-SW direction.
- Geology, Geochemistry and Mineralogy