An Update of Studies of the Bootheel Lineament in the New Madrid Seismic Zone, Southeastern Missouri and Northeastern Arkansas

1992 ◽  
Vol 63 (3) ◽  
pp. 277-284 ◽  
Author(s):  
Eugene S. Schweig ◽  
Ronald T. Marple ◽  
Yong Li
Keyword(s):  
Surface Deformation ◽  
Shear Zones ◽  
Surface Expression ◽  
Seismic Zone ◽  
Near Surface ◽  
Ground Failure ◽  
The North ◽  
Seismogenic Structures ◽  
New Madrid Earthquakes ◽  
New Madrid

Abstract Five trenches across the Bootheel lineament, a possible surface expression of one of the coseismic faults of the great New Madrid earthquakes of 1811 and 1812, indicate that ground failure took place along this 135-km-long feature, probably in 1811 or 1812. The morphology and en echelon pattern of the north-northeast-trending lineament are suggestive of strike-slip displacement on a fault. Three trenches cross portions of the lineament along which liquefied sand was injected. Vertically displaced strata were observed in two of these trenches, but the displacement could be due to collapse caused by the removal of liquefied sand from below. Shear zones exposed in two other trenches do not appear to be directly related to liquefaction and may represent near-surface deformation associated with deeper deformation along potentially seismogenic structures.

Near-surface deformation in the New Madrid Seismic zone as imaged by high resolution SH-wave seismic methods

1993 ◽  
Vol 20 (15) ◽  
pp. 1615-1618 ◽  
Author(s):  
Edward W. Woolery ◽  
Ron L. Street ◽  
Zhenming Wang ◽  
James B. Harris
Keyword(s):  
High Resolution ◽  
Surface Deformation ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Sh Wave ◽  
Near Surface ◽  
Seismic Methods ◽  
New Madrid

scholarly journals Fault source investigation of the 6 December 2016 MwMw 6.5 Pidie Jaya, Indonesia, earthquake based on GPS and its implications of the geological survey result

2020 ◽  
Vol 14 (4) ◽  
pp. 405-412
Author(s):  
Endra Gunawan ◽  
Takuya Nishimura ◽  
Susilo Susilo ◽  
Sri Widiyantoro ◽  
Nanang T. Puspito ◽  
...  
Keyword(s):  
Surface Deformation ◽  
Source Parameters ◽  
Secondary Effects ◽  
Near Surface ◽  
Morphological Attributes ◽  
Ground Shaking ◽  
The North ◽  
Coulomb Failure ◽  
North And South ◽  
Fault Source

AbstractOn 6 December 2016 at 22:03 UTC, a devastating magnitude 6-class strike-slip earthquake occurred along an unidentified and unmapped fault in Pidie Jaya, northern Sumatra. We analysed the possible fault using continuous Global Positioning System (GPS) observation available in the region. In our investigation, we searched for the fault source parameters of the north- and south-dipping left-lateral faults and the west- and east-dipping right-lateral faults. We identified that the fault responsible for the earthquake was located offshore, with a southwest-northeast direction. We also computed the Coulomb failure stress and compared the result with the distribution of the aftershocks. In this study, we demonstrated that the result of the geological field survey conducted soon after the mainshock was attributed to the secondary effects of ground shaking and near-surface deformation, and not surface faulting. The newly identified offshore fault proposed by this study calls for further investigation of the corresponding submarine morphological attributes in this particular region.

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.

On the Search for Paleoliquefaction in the New Madrid Seismic Zone

1992 ◽  
Vol 63 (3) ◽  
pp. 343-348 ◽  
Author(s):  
Steven G. Wesnousky ◽  
Lisa M. Leffler
Keyword(s):  
Drainage Basin ◽  
Return Time ◽  
Historical Seismicity ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Radiocarbon Dates ◽  
New Madrid Earthquakes ◽  
New Madrid

Abstract The great 1811–12 New Madrid earthquakes produced extensive liquefaction in the meisoseismal zone, which is largely within the St. Francis drainage basin of Missouri and Arkansas. We examined 10’s of kilometers of ditch banks within the meisoseismal zone for evidence of prehistoric liquefaction events. Radiocarbon dates indicate that the exposures studied provide a record of the last 5,000 to 10,000 years. Our search has revealed no evidence of widespread paleoliquefaction events and, hence, provides no independent support for the relatively short 550 to 1100 year return time of 1811–12 type earthquakes implied by analyses of the statistics of historical seismicity.

The Darrington seismic zone in northwestern Washington

1989 ◽  
Vol 79 (6) ◽  
pp. 1833-1845
Author(s):  
J. E. Zollweg ◽  
Peggy A. Johnson
Keyword(s):  
Surface Expression ◽  
Seismic Zone ◽  
Single Event ◽  
North Cascades ◽  
Nodal Plane ◽  
Thrust Faulting ◽  
The North ◽  
Crustal Earthquakes ◽  
The Pacific ◽  
Composite Focal Mechanism

Abstract Earthquakes occurring between 1971 and 1988 are evidence for a small zone of crustal seismicity under the western North Cascades near Darrington, Washington. Better-quality hypocenters imply the activity occurs on a fault or fault zone striking N80°W ± 20°, dipping nearly south at 40° ± 15°, with a length along strike of at least 10 km and possibly 20 km or more. We term this feature the Darrington Seismic Zone (DSZ). Focal depths range between 3 and 15 km. A single-event and a composite focal mechanism show nearly pure thrust faulting with one nodal plane in agreement with the hypocenter pattern. P axes strike N20°W to N25°W, in accord with a regional stress direction due to relative motion of the Pacific and North American Plates. No mapped fault can be identified as the surface expression of the zone. The area of the DSZ is adequate to generate a magnitude 5+ earthquake should it rupture in a single event, and an ML 5.6±earthquake on 29 April 1945 in the Cascades ESE of Seattle demonstrates that crustal earthquakes having such magnitudes are possible beneath the western North Cascades. The DSZ is the first crustal seismogenic structure to be identified beneath the North Cascades.

Seismogenic structures of the collision-subduction zone in the eastern Taiwan

2020 ◽  
Author(s):  
Wen-Shan Chen ◽  
Yih-Min Wu ◽  
Hsiao‑Chin Yang ◽  
Po-Yi Yeh ◽  
Yi-Xiu Lai ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Focal Mechanisms ◽  
Reverse Fault ◽  
Seismic Zone ◽  
Eurasian Plate ◽  
Philippine Sea ◽  
The North ◽  
Earthquake Focal Mechanisms ◽  
Seismogenic Structures ◽  
Longitudinal Valley Fault

<p>The Taiwan orogenic belt is relatively young and active with an ongoing arc-continent collision since the middle Miocene. In this study, we systematically investigate the use of seismic tomography, focal-mechanism and distribution of earthquakes to analysis the seismogenic patterns in the collision-subduction zone in the eastern Taiwan, which can be delineated five seismogenic zones of the Longitudinal Valley Fault Seismic Zone (LVFZ), the Central Range Fault Seismic Zone (CRFZ), the Backbone Range Seismic Zone (BRSZ), the Ludao-Lanyu Fault Seismic Zone (LLFZ), and the Wadati-Benioff Seismic Zone (WBSZ).</p><p>The LVFZ and CRFZ, formed along the collision zone between the Philippine Sea and the Eurasian Plates, earthquake focal mechanisms show P axes distributed in direction of 285-335°, reflecting the compressive stress field due to the collision. The LVSZ is the collisional boundary between the Philippine Sea and Eurasian plates. The LLFZ is a high-angle, east-dipping reverse fault separating the Luzon Volcanic Arc and the North Luzon Trough. The Eurasian plate (the South China Sea oceanic crust) subducts beneath the Philippine Sea plat in the southeastern Taiwan forming the WBSZ to a depth of 160 km.</p><p>The CRFZ, located along the eastern limb of Backbone Range, is formed by a zone of west-dipping reverse fault. In addition, the earthquakes on the BRSZ generated by normal and strike-slip faults at about 5-15 km depth which occur in response to left-lateral transtensional deformation by the collision. Earthquake focal mechanisms show P and T axes distributed in direction of 280-330° and 20-70°, respectively.</p>

Sign in / Sign up

Export Citation Format

Share Document