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首页> 外文期刊>Journal of geodynamics >Tectonic displacement and far-field isostatic flexure of pluvial lake shorelines, Dixie Valley, Nevada
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Tectonic displacement and far-field isostatic flexure of pluvial lake shorelines, Dixie Valley, Nevada

机译：内华达州迪克西河谷冲积湖岸线的构造位移和远场等静弯曲

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摘要

Shoreline features formed by the late Pleistocene pluvial Lake Dixie in Dixie Valley, central Nevada, record crustal deformation resulting from isostatic rebound of the Lake Lahontan basin, and from Holocene and historic surface faulting. Constructional beach bars on the east side of Dixie Valley show eastward tilt of 0.16m/km, indicating that lithospheric flexure due to isostatic rebound is symmetrical with the west side of the Lahontan basin. The tilt signal is potentially complicated by post-Lake Dixie fault displacements on the west side of the valley. However, elevation changes recorded geodetically across the analogous 1983 Borah Peak, Idaho earthquake ruptures suggest that coseismic deformation is probably not significant on the east side of the valley relative to the shoreline elevation uncertainties and the overall tilt signal. A survey of faulted shorelines on the west side of the valley suggest that previous fault slip rates estimated from an earlier survey of these same shorelines are in error by nearly a factor of two. Better constrained slip rates from elsewhere along the fault indicate Holocene vertical slip rates of 0.3-0.5 mm/a, consistent with estimates of long term slip rates on the Dixie Valley fault.
机译：内华达州中部迪克西谷的晚更新世冲积湖迪克西形成的海岸线特征记录了由拉洪坦湖盆地的等静回弹，全新世和历史性地表断层引起的地壳变形。迪克西河谷东侧的建设性海滩酒吧向东倾斜0.16m / km，这表明由于等静压回弹引起的岩石圈弯曲与拉洪坦盆地的西侧对称。倾斜信号可能由于山谷西侧的迪克西湖后断层位移而变得复杂。但是，在类似1983年的博拉峰（Borah Peak）上，通过大地测量记录的高程变化，爱达荷州的地震破裂表明，相对于海岸线的高程不确定性和整体倾斜信号，在山谷的东侧，同震变形可能并不明显。对山谷西侧的断层海岸线进行的一项调查表明，根据对这些相同海岸线的早期调查所估计的先前断层滑移率，其误差接近两倍。沿断层其他地方受约束的滑移率较好，表明全新世垂直滑移率为0.3-0.5 mm / a，与Dixie Valley断层的长期滑移率估算值一致。

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