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By Ruth A. M. Schmidt, Warren J. Nokleberg, Robert A. Page

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Geol. Surv. Prof. , 1969. B. Brady, F. A. Page, Evidence for Quaternary movement on the McKinley strand of the Denali fault in the Delta River area, Alaska, Geol. Soc. Am. Bull 84,939-948, 1973. , and L. S. ~ e o lSurv. Prof. , 1912. M. Brocher, G. J. L. Smith, Seismic reflection images of the crust of the northern part of the Chugach terrane, Alaska: Results of a survey for the Trans-Alaska Crustal Transect 1989, in press. (TACT), J. Geophys. L. D. I. Christensen, Crustal structure of accreted terranes of southern Alaska, Chugach Mountains and Copper River basin, from seismic-refraction results, J.

In addition, velocity anisotropy is not as pronounced as it is in the Chugach terrane metaflysch (layer 3'); similar velocities are seen in the Prince William terrane on both lines CP and MG, which meet at a large angle (Figure 1). 5 kmls), locally overlain by a low-velocity zone (layer 6'; LVZ), underlies both the Peninsular and northern Chugach terranes at 9-km depth, extending across the deep projection of the Border Ranges fault system. This relationship suggests that, at least near the Border Ranges fault system, the Peninsular and Chugach terranes are thin and have moved relative to their roots.

A. Page, Evidence for Quaternary movement on the McKinley strand of the Denali fault in the Delta River area, Alaska, Geol. Soc. Am. Bull 84,939-948, 1973. , and L. S. ~ e o lSurv. Prof. , 1912. M. Brocher, G. J. L. Smith, Seismic reflection images of the crust of the northern part of the Chugach terrane, Alaska: Results of a survey for the Trans-Alaska Crustal Transect 1989, in press. (TACT), J. Geophys. L. D. I. Christensen, Crustal structure of accreted terranes of southern Alaska, Chugach Mountains and Copper River basin, from seismic-refraction results, J.

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