A Test of Paleomagnetism as a Correlation and Dating Technique in the New Madrid Seismic Zone

1992 ◽  
Vol 63 (3) ◽  
pp. 367-373 ◽  
Author(s):  
Stephen L. Salyards
Keyword(s):  
Geomagnetic Field ◽  
Field Direction ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Signal Degradation ◽  
The Poor ◽  
Similar Explanation ◽  
Sand Grain Size ◽  
New Madrid

Abstract In order to assess the use of paleomagnetic directions of liquefied sands for correlating and dating paleoseismic events, I studied historic liquefaction deposits in the New Madrid seismic zone to verify their ability to record the ambient geomagnetic field direction at the time of liquefaction. Erupted sand from the 1811–1812 New Madrid events are shown to have a remanent magnetic direction in agreement with the field direction recorded in St. Louis in 1819. There is a large variation in the magnetic quality between two adjacent erupted sand layers. These beds show identical magnetic composition and sand grain-size. Lacking a magnetic explanation for their differing behavior, turbulent forces or deformation causing signal degradation during reliquefaction are the preferred explanation. A similar explanation is also suggested for the poor magnetic quality of an injected dike that is coarser-grained, but magnetically identical to the erupted sands.

3D GEOLOGIC MAPPING IN AND ADJACENT TO THE NEW MADRID SEISMIC ZONE, CENTRAL UNITED STATES

2020 ◽  
Author(s):  
Renee M. Reichenbacher ◽  
◽  
Valarie Harrison ◽  
Taylor Andrew Weathers ◽  
Roy B. Van Arsdale ◽  
...  
Keyword(s):  
United States ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Geologic Mapping ◽  
Central United States ◽  
New Madrid

POSSIBLE SURFACE WARPING ALONG THE BOOTHEEL FAULT REVEALED FROM LIDAR, NEW MADRID SEISMIC ZONE, CENTRAL US

2020 ◽  
Author(s):  
Samia Noor ◽  
◽  
Randel Tom Cox ◽  
Robert Smalley ◽  
Md Rizwanul Hasan
Keyword(s):  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
New Madrid

Stream response to repeated coseismic folding, Tiptonville dome, New Madrid seismic zone

Geomorphology ◽  
2002 ◽  
Vol 43 (3-4) ◽  
pp. 313-349 ◽  
Author(s):  
M.J Guccione ◽  
K Mueller ◽  
J Champion ◽  
S Shepherd ◽  
S.D Carlson ◽  
...  
Keyword(s):  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Stream Response ◽  
New Madrid

The June 13, 1975 earthquake and its relationship to the New Madrid seismic zone

1977 ◽  
Vol 67 (1) ◽  
pp. 209-218
Author(s):  
R. B. Herrmann ◽  
G. W. Fischer ◽  
J. E. Zollweg
Keyword(s):  
Parameter Estimation ◽  
Seismic Moment ◽  
Strong Motion ◽  
P Wave ◽  
Eastern North America ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Long Period ◽  
Consistent Solution ◽  
New Madrid

abstract The June 13, 1975 earthquake in the New Madrid seismic zone produced the first recorded strong-motion accelerograms for an event in the region, as well as the largest recorded accelerations to date for any event in eastern North America. The peak strong-motion values obtained from an analysis of the accelerograms are the following: amax = 43 cm/sec2, vmax = 1 cm/sec and dmax = 0.05 cm for the longitudinal S88°W component; amax = 31 cm/sec2, vmax = 0.6 cm/sec and dmax = 0.01 cm for the DOWN component; amax = 64 cm/sec2, vmax = 1.6 cm/sec2, and dmax = 0.09 cm for the tangential S02°E component. Source parameter estimation using long-period surface waves, Lg spectra, P-wave first motions and the integrated accelerograms leads to a consistent solution. The seismic moment is estimated to be 4E21 dyne-cm and the corner period 0.6 sec. The corner period-seismic moment pair for this event agrees with the regional scaling of these parameters observed by Street et al. (1975).

Evidence for contemporary vertical fault displacement from precise leveling data near the New Madrid seismic zone, western Kentucky

1981 ◽  
Vol 71 (6) ◽  
pp. 1933-1942
Author(s):  
F. Steve Schilt ◽  
Robert E. Reilinger
Keyword(s):  
Surface Deformation ◽  
Apparent Movement ◽  
Normal Fault ◽  
Elastic Half Space ◽  
Focal Mechanisms ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
The Times ◽  
Western Kentucky ◽  
New Madrid

Abstract Relative vertical displacements of bench marks in extreme western Kentucky have been determined by comparison of successive leveling surveys in 1947 and 1968. The resulting pattern of apparent surface deformation shows steep offset which can be closely modeled by a normal fault buried in an elastic half-space. The offset is located near the northern boundary of the Mississippi Embayment and the New Madrid seismic zone, an area where faults have previously been inferred on the basis of both geological and geophysical evidence. If the apparent movement is due to slip along a fault, several lines of evidence (regional structure, earthquake data, and lineations) suggest that the postulated fault trends NNE. Thirteen earthquakes were recorded in this area between the times of leveling; focal mechanisms exist for three of these. The nearest of these three focal mechanisms to the leveling offset implies normal faulting. The magnitude of the earthquake, however, appears to be too small to account for the amount of slip required by the fault model. Thus the apparent deformation may have accumulated with several undetected small earthquakes, or gradually as aseismic creep.

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