The New Madrid seismic zone of the Central United States - Intraplate Earthquakes - page 180

Figure 7.9 Seismically induced Quaternary liquefaction areas in NMSZ, Marianna (M) (Tuttle et al .,
2006 ) , and southeastern Arkansas and northeastern Louisiana (from Cox et al ., 2010 ) . SRFZ, Saline
River fault zone.
(where the Mississippi River crosses Crowley's Ridge at the Missouri-Illinois border)
is relatively seismically quiet now, but has experienced extensive Quaternary faulting
(Harrison et al ., 1999 ; Harrison and Schultz, 2002 ) . Similarly, the southeast Reelfoot
Rift margin north of Dyersburg is seismically quiet, but at Union City, Tennessee, there
is a west-facing fault scarp that reveals Pleistocene faulting of this portion of the rift
margin ( Figure 7.2 ) (Cox et al ., 2001b , 2006). Sikeston Ridge, the southern portion of
Crowley's Ridge (Spitz and Schumm, 1997 ; Van Arsdale et al ., 1995 ) , and Joiner Ridge
are seismically quiet but their bounding faults may have been active during the Pleistocene.
Seventy-five kilometers southwest of Memphis, Tennessee, near the town of Marianna,
Arkansas, is an area of low seismicity that has major earthquake liquefaction that occurred
between 5,000 and 7,000 years ago ( Figure 7.9 ) (Al-Shukri et al ., 2005 ; Tuttle et al ., 2006 ) .