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首页> 外文学位 >Geophysical and geological analysis of fault activity and seismic history of the Obion river area, New Madrid Seismic Zone (NMSZ), western Tennessee, USA.
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Geophysical and geological analysis of fault activity and seismic history of the Obion river area, New Madrid Seismic Zone (NMSZ), western Tennessee, USA.

机译：美国田纳西州新马德里地震带（NMSZ）Obion河地区的断层活动和地震历史的地球物理和地质分析。

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摘要

The New Madrid Seismic Zone (NMSZ) is well known for producing some of the largest intra-cratonic earthquakes within the North American Plate. The common hypothesis for the geological structure within the NMSZ is that stress is released across three major faults: the Cottonwood Grove Fault, the New Madrid North Fault, and the Reelfoot Thrust Fault. Evidence exists that would suggest an alternative model of geologic deformation in the area: that stress is being released across more than these three faults. A geologic and geophysical investigation was done to investigate a hypothetical fault west of Dyersburg, TN to test the alternative multi-fault hypothesis. A seismically created sand blow was logged in close proximity to the fault projection. Weathering of the sand blow indicated that the age of the sand blow came from a seismic event prior to the 1811-1812 earthquakes. There was no evidence to confirm this sand blow was created by a hypothetical fault in close proximity. A seismic exploration of the area was done across four seismic lines, primarily mapping Quaternary-age Mississippi River flood plain deposits. These seismic surveys yielded no evidence to suggest the presence of an additional fault. Across all surveys no evidence was found to conclusively support any existing theory on fault movement in the NMSZ.
机译：新马德里地震带（NMSZ）以在北美板块内产生一些最大的克拉通地震而闻名。 NMSZ内地质结构的普遍假设是应力在三个主要断层之间释放：三叶杨树林断层，新马德里北断层和Reelfoot逆冲断层。有证据表明该地区可以采用另一种地质变形模型：应力释放的范围比这三个断层还多。进行了地质和地球物理调查，以调查田纳西州代尔斯堡以西的假想断层，以检验替代性多断层假说。在断层投影附近记录了地震产生的沙尘。风吹沙的风化表明，风吹沙的年龄来自1811-1812年地震之前的地震事件。没有证据可以证明这种吹沙是由假设的断层造成的。该地区的地震勘探横跨四条地震线，主要是绘制第四纪密西西比河洪水平原沉积物的地图。这些地震调查没有证据表明存在额外的断层。在所有调查中，均未发现任何证据可以最终支持NMSZ中有关断层运动的任何现有理论。

著录项

  • 作者

    Martin, Jake.;

  • 作者单位

    Boston College.;

  • 授予单位 Boston College.;
  • 学科 Geophysics.;Geology.
  • 学位 M.S.
  • 年度 2014
  • 页码 97 p.
  • 总页数 97
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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