Consideration of geomorphic indices in assessment of relative active tectonics in a part of seismogenic compressional Kashmir Basin

Autor: Mukeem Ahmad, Ishtiyaq Ahmad, Maqbool Yousuf, Umair Ali, Qazi Akhter Rasool, Syed Ahmad Ali
Rok vydání: 2021
Předmět:
Zdroj: Arabian Journal of Geosciences. 14
ISSN: 1866-7538
1866-7511
DOI: 10.1007/s12517-021-07523-3
Popis: The area is located in seismically active belt NW Himalaya resultant of collision between Indo-Eurasian plates. Due to presence of faults, folds, and active tectonics of Himalayan region, mountain front designs, behavior of fluvial system, and landform development have been extensively shaped and sculptured by tectonic activity. In the present study, the assessment of relative tectonic activity is carried out in the Sukhnag catchment using geomorphic indices: the stream length-gradient index (SL), basin asymmetry (Af), hypsometric integral (Hi), valley floor width-valley height ratio (Vf), basin shape (Bs), and mountain-front sinuosity (Smf). These indices were used to compute relative tectonic activity (Iat) among 14 sub-watersheds; class 1 (very high relative tectonic activity, nill); class 2 (high, SF 1, 2, 5, 6, 9, and 11); class 3 (moderate, SF 3, 4, 7, 8, and 13); and class 4 (low, SF10, 12, and 14). Tectonic activity is high in sub-watersheds where various tectonic imprints like stream deflections, straightness of streams, deep valleys, steep slopes, and lineaments of tectonic significance showed their presence; these lineaments showed linear trend with the dominant zones of earthquake epicenters in the surroundings. Thus, the areas with higher tectonic activity are analyzed by geomorphic indices, supported by presence of various geomorphic expressions, tectonic imprints and field evidences.
Databáze: OpenAIRE
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