Ancient Seismites (GSA Special Paper 359) by Frank R. Ettensohn, Nicholas Rast, Carlton Elliot Brett

By Frank R. Ettensohn, Nicholas Rast, Carlton Elliot Brett

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The absence of any soil development over the vent sand indicates a minimal time interval between the sand blow and channel deposition. The lag-gravel deposit appears to be conformably interbedded with the middle of the stream channel, but laterally lies unconformably over small sand-blow vents, ejected sand from one vent, and the older fluvial and lacustrine deposits. The upper part of the channel, above the lag gravel, accumulated in a syndepositional syncline along the main fault and thus reflects a surface rupture and is interpreted as a paleoseismite.

Quaternary Geology of the Western Madison Range, Madison Valley, Tobacco Root Range, and Jefferson Valley—Rocky Mountain Friends of the Pleistocene, August 15–19, 1990, Fieldtrip Guidebook: Indianapolis, Indiana University, Department of Geology, p. 194–237. , 1991, Sequence stratigraphy of Cenozoic continental rocks, southwestern Montana: Geological Society of America Bulletin, v. 103, p. 1335–1345. , Guidebook to the geology of Eastern Idaho: Idaho Museum of Natural History, p. 131–139. , 1984, A review of crust and upper mantle structure studies of the Snake River Plain–Yellowstone volcanic system: A major lithospheric anomaly in the western USA: Tectonophysics, v.

The youngest loess deposit (L1, see Fig. 4, Fig. 9) accumulated as colluvial wedges adjacent to both the main and secondary faults. Additionally, the retro-deformation of the faults and strata in the trench log, combined with analysis of structural data from the trench and historic seismicity, allowed us to determine which stress field caused each of the six events. We then calculated the displacement rates and the recurrence intervals for surface rupture for the stress fields that caused these events on the basis of an estimated age of ca.

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