................................................................................................................................ Jl Introduction........................................................................................................................... 1 Geologic Setting................................................................................................................... 5 Data Acquisition and Processing.......................................................................................... 8 Interpretation......................................................................................................................... 9 BS-1 and BS-2.............................................................................................................. 9 GL-1, GL-2, and GL-3.................................................................................................. 12 GL-4.............................................................................................................................. 12 BS-3.............................................................................................................................. 19 BS-4.............................................................................................................................. 19 GL-5.............................................................................................................................. 20 Discussion and Conclusions................................................................................................. 20 Acknowledgments................................................................................................................ 22 References Cited................................................................................................................... 22 FIGURES 1. Relationship of earthquake epicenters, plutons, rift boundaries, and major geologic features in the New Madrid seismic zone to the study area.................................................................................................................................... J2 2. Illustration of style of faulting................................................................................................................................... 4 3. Location of the reflection profiles, wells, and cross section A-A'............................................................................ 5 4. Detail of cross section A-A'...................................................................................................................................... 6 5. Modified stratigraphic column of the Fort Pillow test well....................................................................................... 7 6. Profile BS-1..................................................................................................................................................^^ 10 7. Profile BS-2 ............................................................................................................................ 11 8. SP and resistivity log for the Wilson and Rankin No. 1 J.M. Leach well................................................................. 12 9. Profile GL-1...................................................................................................................................^ 13 10. Profile GL-3............................................................................................................................................................... 14 11. Profile GL-2............................................................................................................................................................... 15 12. Profile GL-4.....................................................................................................................................................^ 16 13. Profile BS-3 ............................................................................................................................................................... 17 14. Profile BS-4....................................................................................................................................................^ 18 15. Profile GL-5....................................................................................................................................................^ 19 16. Location of Crittenden County fault zone in relationship to Reelfoot rift boundary ................................................ 21 TABLES 1. Locations and names of selected drill-hole data........................................................................................................ J3 2. Data-acquisition parameters ...................................................................................................................................... 8