scholarly journals Kinematics of Late Quaternary Slip Along the Qishan‐Mazhao Fault: Implications for Tectonic Deformation on the Southwestern Ordos, China

Tectonics ◽  
2018 ◽  
Vol 37 (9) ◽  
pp. 2983-3000 ◽  
Author(s):  
Xinnan Li ◽  
Peizhen Zhang ◽  
Wenjun Zheng ◽  
Xijie Feng ◽  
Chuanyou Li ◽  
...  
Keyword(s):  
Late Quaternary ◽  
Tectonic Deformation

Fracture lineaments, fault mesh formation and seismicity

2009 ◽  
Vol 42 (1) ◽  
pp. 63-72 ◽  
Author(s):  
Tariq I.H. Rahiman ◽  
Jarg R. Pettinga
Keyword(s):  
Land Surface ◽  
Seismic Reflection ◽  
Late Quaternary ◽  
Statistical Tests ◽  
Tectonic Deformation ◽  
Upper Crust ◽  
Offshore Area ◽  
Seismic Reflection Data ◽  
Spatial Continuity ◽  
Regional Tectonic

Viti Levu, the main island of Fiji, is located in a seismically active area within the Fiji Platform, a remnant island arc that lies in a diffuse plate boundary zone between the Pacific and Australian tectonic plates in the SW Pacific. The upper crust of Viti Levu is dissected by numerous intersecting fault/lineament zones mapped from remote sensing imagery of the land surface (topography, radar and aerial photos) and basement (magnetic) and have been subject to rigorous statistical tests of reproducibility and verification with field mapped fault data. Lineaments on the various imagery correlate with faults mapped in the field, and show spatial continuity between and beyond mapped faults, thereby providing a fuller coverage of regional structural patterns than previously known. Some fault/lineaments zones extend beyond the coastline to the offshore area from the SE Viti Levu study area. Multibeam bathymetry and seismic reflection data show the fault zones occur along and exert control on the location of a number of submarine canyons on the SE slope of Viti Levu. Evidence for Late Quaternary fault activity is only rarely observed in onshore SE Viti Levu (e.g. by displaced shoreline features), and in seismic reflection profiles from offshore. The principal fault sets in Viti Levu represent generations of regional tectonic faulting that pervade the Fiji Platform during and after the disruption of the proto Fijian arc in the Middle to Late Miocene (~15Ma). These fault sets combine to form a complex network of interlocking faults creating a fault mesh that divides the upper crust into a number of fault blocks ranging from ~2-30 km wide. It is inferred that the fault mesh evolved throughout the Neogene as a response to the anticlockwise rotation of the Fiji Platform through progressive development of different fault sets and intervening crustal block rotations. Regional tectonic deformation is presently accommodated in a distributed manner through the entire fault mesh. Low magnitude earthquakes (<M4) occur regularly and may represent ruptures along short linking segments of the fault mesh, while infrequent larger earthquakes (>M4) may result from complex rupture propagation through several linking fault segments of the mesh that lie close to optimum stress orientations. The interpreted model of distributed deformation through the fault mesh for the study area in SE Viti Levu is inferred to be characteristic of the style of active deformation that occurs throughout the entire Fiji Platform.

scholarly journals Submarine Terraces reveal Late Quaternary Tectonic deformation in the Intermediate Zone between the Island Shelf and Rift Zone of the Middle Part of the Nanseishoto Islands, Southwest Japan

2021 ◽  
Author(s):  
Hideaki Goto
Keyword(s):  
Subduction Zone ◽  
Rift Zone ◽  
Late Quaternary ◽  
Middle Part ◽  
Tectonic Deformation ◽  
Southwest Japan ◽  
The West ◽  
West Side ◽  
Marine Terraces ◽  
Island Shelf

Abstract Late Quaternary tectonic deformation of coastal areas is usually examined based on the height distribution of paleo-shorelines observed on marine terraces. However, it is difficult to examine deformation along the subduction zone, in which small, isolated islands are distributed. In this paper, the author focuses on the widespread shallow submarine terraces surrounding the Iheya-Izena islands in the middle part of the Nanseishoto islands, Southwest Japan, where crustal deformation is not known. The islands are located in the intermediate zone between island shelf uplifted during the Late Quaternary and the rift zone occurred to the northwest, along the Okinawa trough. Detailed topographic anaglyph images and maps of the islands were produced using a digital elevation model (DEM) of the seafloor, which is stored by the Japan Coast Guard (JCG) and the Advanced Institute of Science and Technology (AIST). Topographic anaglyph images enabled us to identify the widespread distribution and deformation of the shallow seafloor above −200 m using red-cyan glasses. Four terrace-like features divided by small steps were found on the shallow seafloor, which are named T1, T2, T3, and T4, in descending order. Topographic expressions of paleo-shoreline depths are preserved on submarine terraces formed during the last glacial period. The paleo-shoreline depths of terraces T2 and T3 are −60 m and −70 m on the west side and −70 m and −80 m, respectively, on the east side of Iheyajima island; this indicates southeastward tilting. The tilting ratio of T2 and T3 was calculated to approximately 1‰. The tilting rate is approximately 1×10^4/kyr, assuming that the T2 was formed in 10–11 kyr. This is much more rapid than that of the last inter-glacial marine terraces in the Muroto peninsula of Shikoku, Japan, with a tilting rate of 4×10^5/kyr, which formed by steep northward tilting against the Nankai subduction zone. The author suggests that this phenomenon is not related to mega-thrusting along the subduction zone, but rather to local deformation, probably caused by the reverse faulting of nearby active submarine faults along the west side of the islands.

Seismicity and structure of the Zagros (Iran): the Main Recent Fault between 33 and 35° N

1974 ◽  
Vol 277 (1262) ◽  
pp. 1-25 ◽  
Keyword(s):  
Relative Motion ◽  
Late Quaternary ◽  
Strike Slip ◽  
Arabian Plate ◽  
Tectonic Deformation ◽  
Tectonic History ◽  
History Of ◽  
Slip Deformation ◽  
The Individual ◽  
First Time

The most recent tectonic deformation of the Zagros, and in particular the late Quaternary right-lateral wrench movement along the Main Recent Fault, is summarized in the context of the general tectonic history of the range. The seismicity along the Main Recent Fault between latitudes 33 and 35° N is examined, and details are given for several destructive earthquakes, including the 1909 Selakhor earthquake which was associated with over 40 km of surface faulting along a segment of the Main Recent Fault and which is described here for the first time. The relation between the seismicity and the individual fault segments forming the Main Recent Fault is studied and interpreted in terms of a continuing right-lateral strike slip deformation. The implications of this contemporary deformation for the seismotectonics of the Zagros are considered, and in particular its bearing on the problem of the relative motion of the Arabian Plate with respect to Central Iran.

Oblique Thrust of the Maidan Fault and Late Quaternary Tectonic Deformation in the Southwestern Tian Shan, Northwestern China

Tectonics ◽  
2019 ◽  
Vol 38 (8) ◽  
pp. 2625-2645 ◽  
Author(s):  
Chuanyong Wu ◽  
Wenjun Zheng ◽  
Peizhen Zhang ◽  
Zhuqi Zhang ◽  
Qichao Jia ◽  
...  
Keyword(s):  
Late Quaternary ◽  
Northwestern China ◽  
Tectonic Deformation ◽  
Tian Shan

scholarly journals Submarine terraces reveal Late Quaternary tectonic deformation in the intermediate zone between the island shelf and rift zone of the middle part of the Nanseishoto Islands, southwest Japan

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Hideaki Goto
Keyword(s):  
Subduction Zone ◽  
Rift Zone ◽  
Late Quaternary ◽  
Middle Part ◽  
Tectonic Deformation ◽  
Southwest Japan ◽  
The West ◽  
West Side ◽  
Marine Terraces ◽  
Island Shelf

AbstractLate Quaternary tectonic deformation of coastal areas is usually examined based on the height distribution of paleo-shorelines observed on marine terraces. However, it is difficult to examine deformation along the subduction zone, in which small, isolated islands are distributed. In this paper, the author focuses on the widespread shallow submarine terraces surrounding the Iheya–Izena islands in the middle part of the Nanseishoto Islands, Southwest Japan, where crustal deformation is not known. The islands are located in the intermediate zone between island shelf uplifted during the Late Quaternary and the rift zone occurred to the northwest, along the Okinawa trough. Detailed topographic anaglyph images and maps of the islands were produced using a digital elevation model (DEM) of the seafloor, which is stored by the Japan Coast Guard (JCG) and the Advanced Institute of Science and Technology (AIST). Topographic anaglyph images enabled us to identify the widespread distribution and deformation of the shallow seafloor above − 200 m using red–cyan glasses. Four terrace-like features divided by small steps were found on the shallow seafloor, which are named T1, T2, T3, and T4, in descending order. Topographic expressions of paleo-shoreline depths are preserved on submarine terraces formed during the last glacial period. The paleo-shoreline depths of terraces T2 and T3 are − 60 m and − 70 m on the west side and − 70 m and − 80 m, respectively, on the east side of Iheyajima Island; this indicates southeastward tilting. The tilting ratio of T2 and T3 was calculated to approximately 1‰. The tilting rate is approximately 1 × 10–4/kyr, assuming that the T2 was formed in 10–11 kyr. This is much more rapid than that of the last inter-glacial marine terraces in the Muroto peninsula of Shikoku, Japan, with a tilting rate of 4 × 10–5/kyr, which formed by steep northward tilting against the Nankai subduction zone. The author suggests that this phenomenon is not related to mega-thrusting along the subduction zone, but rather to local deformation, probably caused by the reverse faulting of nearby active submarine faults along the west side of the islands.

scholarly journals Supplemental Material: Late Quaternary active faulting on the inherited Baoertu basement fault within the eastern Tian Shan orogenic belt: Implications for regional tectonic deformation and slip partitioning, NW China

2021 ◽  
Author(s):  
Chuanyong Wu ◽  
et al.
Keyword(s):  
Late Quaternary ◽  
Orogenic Belt ◽  
Tectonic Deformation ◽  
Active Faulting ◽  
Nw China ◽  
Basement Fault ◽  
Regional Tectonic ◽  
Slip Partitioning ◽  
Tian Shan

Figure S1: Profile of velocity components normal to structure striking (E-W components) across the eastern Tian Shan (profile from (85.3°, 41.0°) to (85.3°, 45.0°) with a width of 240 km.

scholarly journals Late Quaternary active faulting on the inherited Baoertu basement fault within the eastern Tian Shan orogenic belt: Implications for regional tectonic deformation and slip partitioning, NW China

2021 ◽  
Author(s):  
Chuanyong Wu ◽  
Guangxue Ren ◽  
Siyu Wang ◽  
Xue Yang ◽  
Gan Chen ◽  
...  
Keyword(s):  
Tarim Basin ◽  
Late Quaternary ◽  
Orogenic Belt ◽  
Tectonic Deformation ◽  
Active Faulting ◽  
Basement Structure ◽  
Thrust Faulting ◽  
Oblique Convergence ◽  
Slip Partitioning ◽  
Tian Shan

The deformation pattern and slip partitioning related to oblique underthrusting of the Tarim Basin in the eastern Tian Shan orogenic belt are not well understood because interior deformation images are lacking. The Baoertu fault is an E-W−striking, ∼350-km-long reactivated basement structure within the eastern Tian Shan. In this study, we quantify its late Quaternary activity based on interpretations of detailed high-resolution remote sensing images and field investigations. Three field observation sites along an ∼80-km-long fault segment indicate that the Baoertu fault is characterized by sinistral thrust faulting. Based on surveying of the displaced geomorphic surfaces with an unmanned drone and dating of the late Quaternary sediments using radiocarbon and optically stimulated luminescence (OSL) methods, we estimate a late Quaternary left-lateral, strike-slip rate of 1.87 ± 0.29 mm/yr and a N−S shortening rate of 0.26 ± 0.04 mm/yr for this fault. The lithospheric Baoertu fault acts as a decoupling zone and accommodates the left-lateral shearing caused by the oblique underthrusting of the Tarim Basin. In the eastern Tian Shan orogenic belt, the oblique convergence is partitioned into thrust faulting across the entire range and sinistral slip faulting on the high-dip basement structure within the orogen. This active faulting pattern in the eastern Tian Shan of sinistral shearing in the center and thrust faulting on both sides can be viewed as giant, crustal-scale positive flower structures.

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