Northwestern Extension of the Reelfoot North Fault Near New Madrid, Missouri

Roy Van Arsdale; Daniel Pryne; Edward Woolery

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Northwestern Extension of the Reelfoot North Fault Near New Madrid, Missouri

机译：密苏里州新马德里附近的Reelfoot North Fault的西北延伸

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The New Madrid seismic zone had at least three M >7 earthquakes during the winter of 1811–1812, but its faults are poorly mapped. Interpretation of 140, 91.4 m (300 ft) deep well logs west of New Madrid, Missouri, reveals a 9.7 km by 6.4 km subsurface high with 30 m of relief on Pleistocene-age Mississippi River gravels. Seismic soundings also reveal an average of 55 m of relief on the PaleoceneWilcox Group, 56 m on the top of the Cretaceous, and 83 m on the top of the Paleozoic section. We interpret this as predominantly structural uplift, herein called the Lilbourn uplift. The uplift appears to be a northwestern extension of the Reelfoot North fault and its hanging wall deformation (the Tiptonville dome).

机译：在1811年至1812年冬季，新马德里地震带至少发生了3次M> 7地震，但其断层分布不佳。对密苏里州新马德里以西140口91.4 m（300 ft）深的测井记录的解释显示，更新世时代的密西西比河砾石有9.7 km x 6.4 km的地下高，浮雕30 m。地震测深还表明，古新世Wilcox组的平均释放量为55 m，白垩纪顶部的平均释放量为56 m，古生代顶部的平均释放量为83 m。我们将其解释为主要是结构性隆升，这里称为Lilbourn隆升。隆起似乎是Reelfoot North断层的西北延伸及其悬壁变形（Tiptonville穹顶）。

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《Seismological research letters》 |2013年第6期|共10页
作者
Roy Van Arsdale; Daniel Pryne; Edward Woolery;
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正文语种 eng
中图分类地震学;
关键词
Database; Earthquakes; Ambiguities;

机译：数据库;地震;歧义;

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Northwestern Extension of the Reelfoot North Fault Near New Madrid, Missouri

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