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首页> 外文期刊>Bulletin of the Seismological Society of America >Late Pleistocene Record of Off-Fault Deformation and Vertical Slip Rates from the Wasatch Fault Zone, Utah: Implications for Fault Segmentation from Lake Bonneville Shorelines
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Late Pleistocene Record of Off-Fault Deformation and Vertical Slip Rates from the Wasatch Fault Zone, Utah: Implications for Fault Segmentation from Lake Bonneville Shorelines

机译：犹他州瓦哈特断层区的迟交逆转变形和垂直滑动率的晚期更新者记录：博涅维尔湖海岸线的故障细分含义

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摘要

In an effort to better understand the Pleistocene history of the Wasatch fault zone, we evaluate the deformation and displacement of the Bonneville and Provo high-stand shorelines of Lake Bonneville along the Wasatch Front. We apply an automated shoreline elevation measurement application developed as part of this study to measure Lake Bonneville shoreline elevations along the Weber and Brigham City segments of the fault, adding to a previously published dataset of shoreline elevations on the Salt Lake City segment. Tectonically deformed shorelines on the footwall of the fault demonstrate elevation patterns that are inconsistent with the idea that the Pleasant View salient, a bedrock salient marking the segment boundary between the Weber and Brigham City segments of the fault, is a persistent barrier to fault rupture since the late Pleistocene. Shoreline features are elevated similar to 20 m across the segment boundary as compared to shoreline features on the northern part of the Brigham City segment. We suggest the possibility that fault rupture through the Pleasant View salient has been common since the late Pleistocene and speculate that a similar relationship could exist between the Provo and Salt Lake City segments, based on similarities between the shoreline elevation patterns on the Brigham City and Salt Lake City segments of the fault. Vertical slip rates measured from displaced shorelines at the Pleasant View salient (Brigham City-Weber segment boundary) are generally higher compared to those at the Honeyville spur (Collinston-Brigham City segment boundary). Statistically significant vertical slip rates calculated from the Provo shoreline at the Pleasant View salient (0.8 +/- 0.5 to 0.9 +/- 0.6 mm/yr and 0.7 +/- 0.5 to 0.9 +/- 0.6 mm/yr) suggest that late Pleistocene vertical slip rates are slightly lower than Holocene rates; however, large uncertainties in the shoreline elevation measurements exist.
机译：为了更好地了解播种器断层区的全新世历史，我们评估了Bonneville Lake Bond Frone的Bonneville和Provo High-Stack海岸的变形和位移。我们应用自动海岸线高程测量应用程序，作为本研究的一部分，以沿着韦伯和布里格姆城区段测量博涅维尔海岸线海拔的一部分，在盐湖城市段中添加到先前发表的海岸线海拔数据集。故障的脚本壁上的细胞般变形覆盖物展示了与令人愉快的观点突出的想法不一致的仰角模式，标记了韦伯和布里格城市区段之间的段边界的基岩突出，是故障破裂的持续障碍迟到的更新世。与Brigham City段的北部的海岸线特征相比，海岸线特征升高到20米。我们建议通过令人垂涎欲滴的突出的故障破裂的可能性，因为普齐罗内科并推测了普罗沃和盐湖城城区之间可能存在类似的关系，基于海盗城市和盐的海岸线高程模式之间的相似之处湖城的断层段。与Honeyville Spur（Collinston-Brigham City Stand边界）相比，垂直滑动率在宜人视角突出（Brigham City-Webter段边界）中的垂直滑动率通常更高。从令人愉快的视图突出的普罗沃海岸线计算的统计学显着的垂直滑移率（0.8 +/- 0.5至0.9 +/- 0.6 mm / Yr和0.7 +/- 0.5至0.9 +/- 0.6 mm / Yr）表明已故的更新世垂直滑动率略低于全茂金率;然而，存在海岸线高程测量中的大不确定性。

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