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  • The fault zones trend down the line of a failed Precambrian rift.
  • Faults responsible for seismic activity in the New Madrid Fault zone are not exposed on the surface.
  • Seismic activity in the area could also be due to the stresses involved with glacial unloading.
  • Intraplate earthquakes are relatively infrequent, and currently there is no working model for intraplate seismicity.
  • Intervals between earthquake occurrences along the New Madrid may exceed the span of historical records, and evidence for the occurrences must be gleaned from paleoseismic or seismic means.
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14y ago
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Q: Why is the New Madrid Fault difficult to study?
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