scholarly journals Oblique convergence and slip partitioning in the NW Himalaya: Implications from GPS measurements

Tectonics ◽  
2014 ◽  
Vol 33 (10) ◽  
pp. 2013-2024 ◽  
Author(s):  
Bhaskar Kundu ◽  
Rajeev Kumar Yadav ◽  
Bikram Singh Bali ◽  
Sonalika Chowdhury ◽  
V. K. Gahalaut
Keyword(s):  
Gps Measurements ◽  
Nw Himalaya ◽  
Oblique Convergence ◽  
Slip Partitioning

scholarly journals Onset of slip partitioning under oblique convergence within scaled physical experiments

Geosphere ◽  
2020 ◽  
Vol 16 (3) ◽  
pp. 875-889 ◽  
Author(s):  
Michele L. Cooke ◽  
Kevin Toeneboehn ◽  
Jennifer L. Hatch
Keyword(s):  
Hanging Wall ◽  
Strike Slip ◽  
Reverse Fault ◽  
Convergent Margins ◽  
Experimental Conditions ◽  
Multiple Faults ◽  
Strain Pattern ◽  
Oblique Convergence ◽  
Wide Range ◽  
Slip Partitioning

Abstract Oblique convergent margins host slip-partitioned faults with simultaneously active strike-slip and reverse faults. Such systems defy energetic considerations that a single oblique-slip fault accommodates deformation more efficiently than multiple faults. To investigate the development of slip partitioning, we record deformation throughout scaled experiments of wet kaolin over a low-convergence (<30°), obliquely slipping basal dislocation. The presence of a precut vertical weakness in the wet kaolin impacts the morphology of faults but is not required for slip partitioning. The experiments reveal three styles of slip partitioning development delineated by the order of faulting and the extent of slip partitioning. Low-convergence angle experiments (5°) produce strike-slip faults prior to reverse faults. In moderate-convergence experiments (10°–25°), the reverse fault forms prior to the strike-slip fault. Strike-slip faults develop either along existing weaknesses (precut or previous reverse-slip faults) or through the coalescence of new echelon cracks. The third style of local slip partitioning along two simultaneously active dipping faults is transient while global slip partitioning persists. The development of two active fault surfaces arises from changes in off-fault strain pattern after development of the first fault. With early strike-slip faults, off-fault contraction accumulates to produce a new reverse fault. Systems with early lobate reverse faults accommodate limited strike-slip and produce extension in the hanging wall, thereby promoting strike-slip faulting. The observation of persistent slip partitioning under a wide range of experimental conditions demonstrates why such systems are frequently observed in oblique convergence crustal margins around the world.

DEVELOPMENT OF NON-STEADY STATE SLIP PARTITIONING UNDER OBLIQUE CONVERGENCE

2017 ◽  
Author(s):  
Michele L. Cooke ◽  
◽  
Kevin Toeneboehn ◽  
Jennifer L. Beyer
Keyword(s):  
Steady State ◽  
Oblique Convergence ◽  
Slip Partitioning

Seismotectonics of central and NW Himalaya: plate boundary–wedge thrust earthquakes in thin- and thick-skinned tectonic framework

2018 ◽  
Vol 481 (1) ◽  
pp. 41-63 ◽  
Author(s):  
V. C. Thakur ◽  
R. Jayangondaperumal ◽  
V. Joevivek
Keyword(s):  
Hanging Wall ◽  
Plate Boundary ◽  
Central Himalaya ◽  
Main Central Thrust ◽  
Nw Himalaya ◽  
Oblique Convergence ◽  
Normal Convergence ◽  
Tectonic Framework ◽  
Historical Accounts ◽  
Large Earthquakes

AbstractThe tectonic framework of NW Himalaya is different from that of the central Himalaya with respect to the position of the Main Central Thrust and Higher Himalayan Crystalline and the Lesser and Sub Himalayan structures. The former is characterized by thick-skinned tectonics, whereas the thin-skinned model explains the tectonic evolution of the central Himalaya. The boundary between the two segments of Himalaya is recognized along the Ropar–Manali lineament fault zone. The normal convergence rate within the Himalaya decreases from c. 18 mm a−1 in the central to c. 15 mm a−1 in the NW segments. In the last 800 years of historical accounts of large earthquakes of magnitude Mw ≥ 7, there are seven earthquakes clustered in the central Himalaya, whereas three reported earthquakes are widely separated in the NW Himalaya. The earthquakes in central Himalaya are inferred as occurring over the plate boundary fault, the Main Himalayan Thrust. The wedge thrust earthquakes in NW Himalaya originate over the faults on the hanging wall of the Main Himalayan Thrust. Palaeoseismic evidence recorded on the Himalayan front suggests the occurrence of giant earthquakes in the central Himalaya. The lack of such an event reported in the NW Himalaya may be due to oblique convergence.

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.

scholarly journals Oblique convergence in the Himalayas of western Nepal deduced from preliminary results of GPS measurements

1999 ◽  
Vol 26 (13) ◽  
pp. 1933-1936 ◽  
Author(s):  
F. Jouanne ◽  
J. L. Mugnier ◽  
M. R. Pandey ◽  
J. F. Gamond ◽  
P. Le Fort ◽  
...  
Keyword(s):  
Gps Measurements ◽  
Preliminary Results ◽  
Oblique Convergence

GPS measurements on the island of Hawaii in 1992

1994 ◽  
Author(s):  
Asta Miklius ◽  
E.Y. Iwatsubo ◽  
R.P. Denlinger ◽  
A.T. Okamura ◽  
M.K. Sako ◽  
...  
Keyword(s):  
Gps Measurements
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