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- W2302202313 abstract "Pedologic, geomorphic, and geochronologic data suggest that liquefaction occurred along the Bootheel lineament of Missouri and Arkansas during the 1811-1812 New Madrid earthquake sequence. The authors propose that the lineament may be the surface trace of a relatively young fault zone consisting of multiple strike-slip flower structures. These structures have been interpreted over a zone at least 5 km wide exhibiting deformed strata at least as young as a regional Eocene/Quaternary unconformity. In physical models, flower structures form in less rigid material in response to low finite displacement across a discrete strike-slip shear zone in a rigid basement. By analogy, the Bootheel lineament may represent the most recent attempt of a strike-slip fault zone of relatively low displacement to propagate through a weak cover. In addition, the Bootheel lineament extends between two well-established, seismically active strike-slip fault zones that current form a restraining step. Restraining steps along strike-slip fault zones are inherently unstable, and thus the Bootheel lineament may be acting to smooth the trace of the New Madrid seismic zone as displacement increases. The current seismic inactivity along the Bootheel lineament may be explained by sequential accommodation of complex strain in which the stress field is highly variable withinmore » the source volume. In other words, the current stress field may not represent that which operated during the 1811-1812 sequence. Alternatively, an earthquake on a fault associated with the bootheel lineament may have released sufficient strain energy to temporarily shut down activity.« less" @default.
- W2302202313 created "2016-06-24" @default.
- W2302202313 creator A5075429180 @default.
- W2302202313 date "1992-01-01" @default.
- W2302202313 modified "2023-09-23" @default.
- W2302202313 title "The Bootheel lineament, the 1811-1812 New Madrid earthquake sequence, and modern seismicity" @default.
- W2302202313 hasPublicationYear "1992" @default.
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