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Structure of the inter-basin transition zone between Dixie Valley and Fairview Valley, Nevada, USA.

机译：美国内华达州迪克西谷和费尔维尤谷之间的流域间过渡带的结构。

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摘要

In 1954, two major earthquakes spaced four minutes apart produced two surface rupture systems: the Fairview Peak fault zone and Dixie Valley fault zone distributed over the area between the Dixie Valley Structural Basin (DVSB) and Fairview Valley Structural Basin (FVSB). The two fault systems display a ten km inter-rupture discontinuity, which this study refers to as the Inter-Basin Transition Zone (IBTZ).;This study offers an interpretation of the structural geometry of the IBTZ based on new gravity data (318 stations) integrated with rupture patterns, GPS strain tensor, seismic focal mechanism, and related geological studies. A new Complete Bouguer Anomaly (CBA) gravity map reveals the basement structural relief in the IBTZ. Northwest gravity gradients and rupture termination alignments were chosen as the approximate structural boundaries of the IBTZ which measures approximately 20 km north to south. An interpretation of basement depths assuming densities associated with Tertiary alluvium and volcanic basin fill over Mesozoic metasedimentary basement indicates the DVSB and FVSB terminate in smaller structural basins. These form a roughly antisymmetric pair of north-south trending, right-stepping graben (3 to 5 km wide and 600-700 m deep), which attenuate in relief toward a central overlap area.;The graben are consistent with the concept of a zone of maximum east-west extension cutting through the IBTZ, which aligns with the southward projection of the maximum east-west extension in western Dixie Valley reported by other studies. The right-overlap area and significant rupture segments associated with the 1954 Fairview Peak-Dixie Valley earthquake sequence seem to be controlled by the interpreted boundaries of the gravity defined IBTZ, which appears to be an anticlinal antithetic accommodation zone with relay ramps.;Analysis of GPS strain tensor, earthquake focal mechanism solutions, and rupture patterns support the influence of northwest-southeast crustal shear across the 60 km wide zone containing the north-south Fairview Peak surface ruptures.;Elevenmile Canyon and Pirouette Mountain geothermal fields are two low temperature geothermal systems located in antisymmetric structural nodes of the IBTZ, where northwest IBTZ boundaries intersect the north-south graben (range-front) faults. We suggest that these intersection zones have potential to facilitate deep convective geothermal flow.
机译：1954年，相距四分钟的两次大地震产生了两个地表破裂系统：Fairview峰断裂带和Dixie Valley断裂带分布在Dixie谷构造盆地（DVSB）和Fairview谷构造盆地（FVSB）之间。这两个断层系统显示了10 km的破裂间断，该研究被称为盆地间过渡带（IBTZ）。该研究基于新的重力数据（318个测站）对IBTZ的结构几何进行了解释）与破裂模式，GPS应变张量，地震震源机制以及相关的地质研究相结合。新的完全布格异常（CBA）重力图显示了IBTZ中地下室的结构浮雕。选择西北重力梯度和破裂终止线作为IBTZ的近似结构边界，该边界的测量范围为北至南约20 km。假设与中生代沉积基底上的第三纪冲积层和火山盆地相关的密度，对基底深度的解释表明，DVSB和FVSB终止于较小的构造盆地。这些形成了一对大致呈反对称的南北向，向右拐弯的棘爪（宽3至5 km，深600-700 m），向中央重叠区域的释放力减弱。其他研究报道，最大的东西向扩展区穿过IBTZ，与迪克西河谷西部最大的东西向扩展区的南投影一致。与1954年Fairview Peak-Dixie Valley地震序列相关的右交叠区域和明显的破裂片段似乎受重力定义的IBTZ边界的控制，该边界似乎是一个带有中继坡道的反斜线对偶适应带。 GPS应变张量，地震震源机制解和破裂模式支持了西南-东南地壳剪切力在60 km宽的区域内的影响，该区域包含南北向Fairview峰表面破裂。十一英里峡谷和皮鲁埃特山地热场是两个低温地热系统位于IBTZ的反对称结构节点上，西北IBTZ边界与南北向uth陷（范围前）断层相交。我们建议这些相交带具有促进深对流地热流动的潜力。

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  • 作者

    Mankhemthong, Niti.;

  • 作者单位

    University of Nevada, Reno.;

  • 授予单位 University of Nevada, Reno.;
  • 学科 Geology.;Geophysics.
  • 学位 M.S.
  • 年度 2008
  • 页码 132 p.
  • 总页数 132
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;地球物理学;
  • 关键词

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