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On and Off Shore Studies of the Trench Canyon Fault Zone, Mono Lake, Northeastern California.

机译：加利福尼亚州东北部莫诺湖的Trench Canyon断层带的陆上和离岸研究。

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The northern Mono Basin, located on the California-Nevada border, lies geographically within the tectonically active central Walker Lane fault system (figure 1), a region currently responsible for accommodating ∼ 10 mm/yr of right lateral slip produced by relative motion between the Pacific and North American plates. I conducted studies on a previously hypothesized but unexamined ∼ 20 km long fault zone (the Trench Canyon Fault Zone (TCFZ)) spanning from Cedar Hill Volcano northeast of Mono Lake to Negit Island within the lake. Onshore studies of the lineament include intensive analysis of: aerial imagery, relict shorelines and their elevations, scarp profiles and field observations. We also conducted seismic surveys of the lake bottom with the aid of the United States Geologic Survey, and side scan sonar surveys were conducted by Dr. Milene Cormier and Hal Johnson from the University of Missouri - Columbia.;Onshore studies reveal that the northern most lineaments in the study area (which was deemed the northern TCFZ) are not in fact fault induced scarps, but rather wave cuts incised during the desiccation of ancient Lake Russell (the parent body of modern day Mono Lake) onto a topographic high. Additionally, no positive evidence of faulting could be discerned spanning from the present day shoreline of Mono Lake northward on land for approximately 4.5 kilometers. Constrained within these northern and southern brackets are sets of discontinuous, en echelon fault induced lineaments, with a known component of normal faulting. Spanning a total of ~6.5 km at an approximate strike of N40E, I propose the onshore component of the TCFZ has been active within the last 3500 -- 12000 years.;Offshore studies and seismic analysis revealed a significant number of faults within Mono Lake. I identified twenty-one potential fault features on 5 of the 9 traverses conducted and analyzed in the study area, revealing dip slip components of offset ranging from ∼ 0.5 meters to greater than 2 meters. However, due to shallow water, natural lake hazards, distances between seismic survey lines, and the discontinuity of interpreted faulting events, I found linear correlation between individual faulting events to be difficult and therefore speculative, as was any association between offshore faulting and the onshore culmination of the TCFZ.;The TCFZ can be positively and confidently identified as a ∼ 6.5 km long set of discontinuous onshore faults, a fraction of the originally proposed ∼ 20 km lineament theorized to span onshore from Cedar Hill Volcano near the California- Nevada border offshore into modern day Mono Lake.
机译：位于加利福尼亚州-内华达州边界的北部Mono盆地在地理上位于构造活动的中央Walker Lane断层系统内（图1），该区域目前负责容纳〜10 mm / yr的右旋滑移，该右旋滑移是由构造运动之间的相对运动产生的。太平洋和北美板块。我对以前假设但未经检查的约20 km长的断层带（Trench Canyon断层带（TCFZ））进行了研究，该断层带从Mono湖东北部的Cedar Hill火山到该湖内的Negit岛。在陆上对沿线的研究包括对以下方面的深入分析：航空影像，遗迹海岸线及其海拔，陡坡剖面和野外观察。我们还借助美国地质调查局对湖底进行了地震勘测，并由密苏里大学哥伦比亚大学的Milene Cormier博士和Hal Johnson进行了侧面扫描声纳勘测；陆上研究表明，北部最北部实际上，研究区的构造（不是北部的TCFZ）并不是断层引起的陡坡，而是在古罗素湖（现代莫诺湖的母体）干燥至地形高处时切开的波浪。此外，从今天的莫诺湖北岸到陆地上约4.5公里，没有发现断层的积极证据。在这些北部和南部支架内，约束有不连续的，梯形断层引起的构造，具有正常断层的已知成分。我认为，在N40E大致走向的情况下，整个跨度约为6.5公里，我认为TCFZ的陆上部分在​​过去3500年至12000年内一直活跃。;海上研究和地震分析显示，莫诺湖内有大量断层。我在研究区域进行了9条导线中的5条，确定了21条潜在的断层特征，揭示了偏移量从〜0.5米到大于2米的倾滑分量。但是，由于浅水，天然湖泊的危害，地震勘测线之间的距离以及解释的断层事件的不连续性，我发现单个断层事件之间的线性相关性很困难，因此是推测性的，海上断层与陆上断层之间的任何关联也是如此TCFZ可以被确定地确定为大约6.5 km长的不连续陆上断层，这是最初提出的大约20 km沿线构造的一部分，理论上认为是从加利福尼亚-内华达州边界附近的Cedar Hill火山跨越陆上近海进入现代的莫诺湖。

著录项

  • 作者

    Novick, Michael William.;

  • 作者单位

    University of California, Davis.;

  • 授予单位 University of California, Davis.;
  • 学科 Geology.;Physical Oceanography.;Geomorphology.
  • 学位 M.S.
  • 年度 2011
  • 页码 104 p.
  • 总页数 104
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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