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Detailed Reference Information |
Anders, M.H., Spiegelman, M., Rodgers, D.W. and Hagstrum, J.T. (1993). The growth of fault-bounded tilt blocks. Tectonics 12: doi: 10.1029/93TC01547. issn: 0278-7407. |
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A series of uniformly tilted fault-bounded blocks is a common feature in actively extending regions such as the Basin and Range province. If the tilted blocks were produced by rigid ''domino-style'' rotation, one would predict large voids at either end of a series of these blocks. Using tilt data and a simple flexural calculation, we suggest that much of the apparent rigid behavior could also be produced by internal block deformation. In our model of normal fault growth, isostatic/elastic uplift of the footwall is coupled with hanging wall downdrop within the region between faults, resulting in the appearance of a tilted rigid block. We present tilt data sampled at varying distances from several block-defining faults within the northeast Basin and Range province. Tilt measurements between a series of 30-km spaced block-defining faults are found to be uniform, while tilts between more widely spaced faults exhibit a pattern of tilt that diminishes to zero in less than 30 km. Using a simple flexural calculation for internal block deformation, we show that for this region the patterns of tilt are consistent with a flexural length scale of ~8--12 km and deflections of 2--4 km. These estimates are compatible with both the lower limit to seismicity and basin depth determined from earthquake and seismic reflection studies. ¿ American Geophysical Union 1993 |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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