Evidence of Active Tectonic Deformation in Kishtwar Area, Jammu and Kashmir, Northwest Himalaya, India

2019 ◽  
Vol 93 (3) ◽  
pp. 331-342
Author(s):  
Ahsan ul Haq ◽  
S. K. Pandita ◽  
Yudhbir Singh ◽  
G. M. Bhat ◽  
Shiv Jyoti Pandey ◽  
...  
Keyword(s):  
Tectonic Deformation ◽  
Jammu And Kashmir ◽  
Northwest Himalaya ◽  
Active Tectonic

How submarine channels (re)shape continental margins

2020 ◽  
Vol 90 (11) ◽  
pp. 1581-1600
Author(s):  
Luke A. Pettinga ◽  
Zane R. Jobe
Keyword(s):  
Continental Margin ◽  
Evolution Model ◽  
Sediment Supply ◽  
Tectonic Deformation ◽  
Continental Margins ◽  
Sedimentary Processes ◽  
Submarine Channels ◽  
Active Tectonic ◽  
Tectonic Settings ◽  
Longitudinal Profiles

ABSTRACT Submarine landscapes, like their terrestrial counterparts, are sculpted by autogenic sedimentary processes toward morphologies at equilibrium with their allogenic controls. While submarine channels and nearby, inter-channel continental-margin areas share boundary conditions (e.g., terrestrial sediment supply, tectonic deformation), there are significant differences between the style, recurrence, and magnitude of their respective autogenic sedimentary processes. We predict that these process-based differences affect the rates of geomorphic change and equilibrium (i.e., graded) morphologies of submarine-channel and continental-margin longitudinal profiles. To gain insight into this proposed relationship, we document, classify (using machine learning), and analyze longitudinal profiles from 50 siliciclastic continental margins and associated submarine channels which represent a range of sediment-supply regimes and tectonic settings. These profiles tend to evolve toward smooth, lower-gradient longitudinal profiles, and we created a “smoothness” metric as a proxy for the relative maturity of these profiles toward the idealized equilibrium profile. Generally, higher smoothness values occur in systems with larger sediment supply, and the smoothness of channels typically exceeds that of the associated continental margin. We propose that the high rates of erosion, bypass, and deposition via sediment gravity flows act to smooth and mature channel profiles more rapidly than the surrounding continental margin, which is dominated by less-energetic diffusive sedimentary processes. Additionally, tectonic deformation will act to reduce the smoothness of these longitudinal profiles. Importantly, the relationship between total sediment supply and the difference between smoothness values of associated continental margins and submarine channels (the “smoothness Δ”) follows separate trends in passive and active tectonic settings, which we attribute to the variability in relative rates of smoothness development between channelized and inter-channel environments in the presence or absence of tectonic deformation. We propose two endmember pathways by which continental margins and submarine channels coevolve towards their respective equilibrium profiles with increased sediment supply: 1) Coupled Evolution Model (common in passive tectonic settings), in which the smoothness Δ increases only slightly before remaining static, and 2) Decoupled Evolution Model (common in active tectonic settings), in which the smoothness Δ increases more rapidly and to a greater final value. Our analysis indicates that the interaction of the allogenic factors of sediment supply and tectonic deformation with the autogenic sedimentary processes characteristic of channelized and inter-channel areas of the continental margin may account for much of the variability between coevolution pathways and depositional architectures.

scholarly journals Subsurface Structural and Crustal Assessment on the Basis of Gravity Data Along Bagh, Dir Kot and Adjoining Areas of Azad Jammu and Kashmir, Pakistan

2020 ◽  
Vol 10 (4) ◽  
pp. 19-24
Author(s):  
Hadayat Ullah ◽  
Mubashir Mehmood ◽  
Muhammad Jehangir Khan ◽  
Sami Ullah ◽  
Shahzada Khurram ◽  
...  
Keyword(s):  
Gravity Data ◽  
Research Work ◽  
Crustal Thickness ◽  
Jammu And Kashmir ◽  
Active Tectonic ◽  
Survey Technique ◽  
Thin Skin ◽  
Surrounding Areas ◽  
Tectonic Belt ◽  
Thick Skin

The research work is based on gravity data is taken from numerous parts of an active tectonic belt of AzadKashmir to delineate the crustal thickness and demarcation of thin- skin and thick-skin structures in the study area. Thestudy area includes Bagh, Dhirkot, Arja, Kohala, Sudhan Gali, Ghazi Abad, Chikkar and Chakoti. The study areabounded by the latitude 33°59′3″ and 34°9′22″ N and longitude 73°37′26″ and 73°40′16″ E. The proposed study area isa complex geological entity and is an active zone. This study has been focused to assess the subsurface lithology andstructural geometry present in Bagh and surrounding areas. For this purpose the gravity data has been acquired with thehelp of CG-5 Auto-grav using multi-profile survey technique. Gravity model suggested that Riasi Thrust in the studyzone is plunging at an angle of 42° NE and pierces to a depth of 7 km in the sub-surface. The model also suggested thatBagh Basement Fault in the study area is dipping at an angle of 75° NE in the crystalline basement up to Moho depth.Shaheed Galli Thrust has been delineated in Dhirkot area. The fault dips at 49° NE and penetrated up to a depth of 8km in the sedimentary/meta-sedimentary wedge. The geological model demarcated, 11 km depth of sedimentary/metasedimentary wedge in the southwest and 13 km in the northeast area. The crustal thickness increases from 51 km in thesouthwest area to about 53.17 km in the northeast area.

Geomorphic analysis reveals active tectonic deformation on the eastern flank of the Pir Panjal Range, Kashmir Valley, India

2013 ◽  
Vol 7 (6) ◽  
pp. 2225-2235 ◽  
Author(s):  
Shabir Ahmad ◽  
M. I. Bhat ◽  
Christopher Madden ◽  
B. S. Bali
Keyword(s):  
Tectonic Deformation ◽  
Kashmir Valley ◽  
Eastern Flank ◽  
Active Tectonic

scholarly journals Identifikasi Deformasi Tektonik Aktif Berdasarkan Ekstraksi Kelurusan Morfologi dan Seismisitas di Sukabumi, Jawa Barat

EKSPLORIUM ◽  
2021 ◽  
Vol 42 (1) ◽  
pp. 31
Author(s):  
Rizqi Muhammad Mahbub ◽  
Candra Ragil
Keyword(s):  
Active Fault ◽  
Research Area ◽  
Fault Reactivation ◽  
Geospatial Data ◽  
Tectonic Deformation ◽  
Fault Movement ◽  
Filtering Method ◽  
Active Tectonic ◽  
The Relationship ◽  
Dominant Direction

ABSTRAK Pusat gempa bumi di Sukabumi telah membentuk deformasi bawah permukaan dan kini terekam juga di permukaan. Hal itu termanifestasi melalui geomorfologi kelurusan gawir dan sungai. Ekstraksi kelurusan-kelurusan akibat deformasi geologi tersebut dapat digunakan untuk mengidentifikasi deformasi tektonik aktifnya. Tujuan penelitian ini adalah untuk mengetahui hubungan antara struktur sesar aktif dengan arah dominan kelurusan di daerah penelitian. Metode Edge Enhancing Filtering digunakan untuk menginterpretasi kelurusan secara manual dan semi-otomatis. Data geospasial kelurusan diekstraksi menggunakan formula Sastratenaya untuk mengetahui kronologi kelurusan yang terbentuk. Hasil analisis menggunakan formula Sastratenaya menunjukkan kelurusan-kelurusan yang terekam melalui olah data peta DEM, yaitu segmen 1 berarah N315°E dan segmen 2 berarah N10°E yang diinterpretasikan sebagai hasil reaktivasi sesar. Hal ini dapat diinterpretasikan bahwa Sesar Cimandiri, yang merupakan sesar aktif dengan pergerakan oblique-slip sinistral N88°E/85° rake 33°, memengaruhi arah dua segmen kelurusan di daerah penelitian wilayah Sukabumi, Jawa Barat.ABSTRACT The epicenter of the earthquake in Sukabumi has formed subsurface deformation which is now also recorded on the surface area. This is manifested through the geomorphology of the scarp and river lineaments. Extraction of lineaments produced by geological deformation can be used to identify its active tectonic deformation. The research objective is to determine the relationship between the active fault structure and the dominant direction of lineaments in the study area. The Edge Enhancing Filtering method is used to interpret lineaments manually and semi-automatically. The lineament geospatial data was extracted using the Sastratenaya formula to determine the chronology of the lineaments formed. The Sastratenaya formula results showed the lineaments recorded by DEM images data processing, the first segment direction is N315°E and the second is N10°E, both are interpreted as the result of fault reactivation. It can be interpreted that the Cimandiri Fault, which is an active fault that has an N88°E/85° rake 33° sinistral oblique-slip fault movement, affects the lineaments direction of two segments in the research area of Sukabumi, West Java.

scholarly journals Geomorphic evidence for active tectonic deformation in the coastal part of Eastern Black Sea, Eastern Pontides, Turkey

2018 ◽  
Vol 30 (1) ◽  
pp. 249-264 ◽  
Author(s):  
Mustafa Softa ◽  
Tahir Emre ◽  
Hasan Sözbilir ◽  
Joel Q. G. Spencer ◽  
Mehmet Turan
Keyword(s):  
Black Sea ◽  
Tectonic Deformation ◽  
Eastern Pontides ◽  
Active Tectonic
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