Earthquake Focal Mechanisms in the New Madrid Seismic Zone

2014 ◽  
Vol 85 (2) ◽  
pp. 257-267 ◽  
Author(s):  
G. A. Johnson ◽  
S. P. Horton ◽  
M. Withers ◽  
R. Cox
Keyword(s):  
Focal Mechanisms ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Earthquake Focal Mechanisms ◽  
New Madrid

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.

Focal mechanism studies in the New Madrid seismic zone

1978 ◽  
Vol 68 (4) ◽  
pp. 1095-1102 ◽  
Author(s):  
Robert B. Herrmann ◽  
Jose-Antonio Canas
Keyword(s):  
Surface Wave ◽  
Focal Mechanism ◽  
Focal Mechanisms ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Long Period ◽  
Composite Focal Mechanism ◽  
Surface Wave Data ◽  
Array Geometry ◽  
New Madrid

abstract A recent study of seismicity in the New Madrid seismic zone by Stauder et al. (1976) has shown the existence of linear micro-earthquake patterns of up to 120 km in length. This study presents the results of composite microearthquake focal mechanism studies along these trends together with focal mechanisms obtained using long-period surface-wave data from larger events. Due to the present microearthquake array geometry, the composite focal mechanism studies do not indicate a complete picture of the nature of the earthquake processes for all the trends. However, the motion on the major 120-km long trend into northeastern Arkansas has significant components of right lateral fault motion. The consistency of surface-wave focal mechanisms and the composite focal mechanism along this trend indicates that it should be considered as a single tectonic unit.

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
Sign in / Sign up

Export Citation Format

Share Document