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A recently compiled 80 000-line-kilometer aeromagnetic survey of the State of Kansas, flown under uniform specifications, provides an excellent database for spectral-enhancement techniques. A suite of spectrally filtered maps of Kansas is proving useful in the regional study of the Precambrian basement. The pole-correction map (i.e., the reduced-to-the-pole map minus the original map) enhances an east-west-trending boundary between Precambrian terranes of different age. The second-vertical-derivative map reveals extensive basement faults trending southwest through central Kansas. The combination of high-frequency-pass and trend-pass filters reveals the bounding faults of the Central North American rift system (CNARS). The upward and downward continuation filters are also useful in delineating basement terranes. These maps reveal parallelism between the Humboldt fault, which bounds the eastern side of the Nemaha uplift, and the CNARS. This suggests that the Humboldt fault probably developed as one of the easternmost faults of the CNARS in late Precambrian time and was reactivated in late Paleozoic time. Recent seismicity indicates that some of the CNARS faults are active today.

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