Geomorphic assessment of active tectonics in the Acambay graben, Mexican Volcanic Belt

Ramírez‐Herrera, María Teresa

doi:10.1002/(sici)1096-9837(199804)23:4<317::aid-esp845>3.3.co;2-m

Cited by 40 publications

(58 citation statements)

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“…Rapidly uplifted mountain fronts generally produce elongated and steep basins [21]. In active tectonic areas, the shape of young drainage basins relatively are elongated in parallel to the topographic slope of a mountain.…”

Section: Drainage Basin Shape Index (Bs)mentioning

confidence: 99%

“…The horizontal projection of a basin may be described by the basin shape index or the elongation ratio, Bs [21] or elongation ratio is expressed as:…”

Section: Drainage Basin Shape Index (Bs)mentioning

confidence: 99%

“…Therefore, "Bs" is related to the rate of active tectonics. "Bs" was calculated by using the DEM and classified into three classes: class 3 (inactive (Bs < 3)); class 2 (semi active (3 < Bs < 4)) and class 1 (active (4 < Bs)) [10] & [21]. Computations show that sub-basin 4 has the lowest Bs value (1.4) and sub-basin 12 has the highest (5.5) ( Table 2 and Table 4).…”

Section: Drainage Basin Shape Index (Bs)mentioning

confidence: 99%

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Evaluate Tectonic Activity of Tehran City (Iran) Based on Geomorphic Indices, Field Investigation and Remote Sensing Study

Asl¹,

Abbassi²

2019

OJER

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Active tectonics in the south part of Alborz Mountain (Iran) has greatly influenced the drainage system and geomorphic expressions. The metropolis of Tehran is located at the southern foothills of the Alborz Mountains at the abrupt topographic boundary between the mountain range and the northern border of the central Kavir Desert. The presence of active faults and tectonic activity, threatens the area and shows the vulnerability of this Tehran city. So the evaluation of active tectonics of Tehran City is necessary because of vast human activity, which has hidden geomorphic feature. Active tectonics of Tehran City was evaluated by using Digital elevation model (DEM) derived drainage network and three geomorphic indices basin (asymmetry factor (AF), basin shape index (Bs) and mountain front sinuosity (Smf)). The average of the three measured geomorphic indices was used to evaluate the distribution of relative tectonic activity in the study area. Furthermore to overcome some inevitable error in this method, field investigation was carried out also remote sense was studied, and finally the obtained results were compared with existing seismic data. The result confirms that the East South, East North and West North Tehran have high rate of relative tectonic activity (RTA) respectively.The tectonic activity in the Alborz mountain range, northern Iran, is results of both to the northward convergence of central Iran toward Eurasia, and to the northwestward motion of the South Caspian Basin with respect to Eurasia inducing a left-lateral wrenching along this range. These two mechanisms give rise to a NNE-SSW transpressional regime. The GPS measurements shown NNE-directed shortening with a rate of 5 ± 2 mm yr −1 ; In addition, a range-wide shearing is observed at a rate of 4 ± 2 mm yr −1 , which is related with left-lateral motion on E-W striking structures [7] [8] (Figure 1). MethodologyIn recent decades various researchers along morpho-tectonic quality indices, Z. Mohammadi Asl, M. R. Abbassi

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Section: Drainage Basin Shape Index (Bs)mentioning

confidence: 99%

“…The horizontal projection of a basin may be described by the basin shape index or the elongation ratio, Bs [21] or elongation ratio is expressed as:…”

Section: Drainage Basin Shape Index (Bs)mentioning

confidence: 99%

Section: Drainage Basin Shape Index (Bs)mentioning

confidence: 99%

See 1 more Smart Citation

Evaluate Tectonic Activity of Tehran City (Iran) Based on Geomorphic Indices, Field Investigation and Remote Sensing Study

Asl¹,

Abbassi²

2019

OJER

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“…In general, a series of cones and facets are developed within the trace of the fault. Generally, the triangular to polyhedral hill slopes are situated between two adjacent drainage structures within a given mountain front escarpment [56], which are generated by the recurrent faulting along the base of the escapements [57,58] and mostly occur in the tectonically active areas [59]. Generally, the Saryu River is very wide from Seraghat to Naichun along the zone of NAT (see Figure 6(a)).…”

Section: Landscape Characteristics Of Rfmentioning

confidence: 99%

“…The longitudinal profile is used to identify the tectonic and river response as it is a graph of the relationship between river elevation and river length [37]. The longitudinal profiles of the river show irregular pattern which might reflect disequilibrium conditions, suggesting uplift along active faults [56]. The sudden break in the river profile suggests the presence of knick points along the slope (Figure 7(c)).…”

Section: Longitudinal Profiles and Stream Gradient Indexmentioning

confidence: 99%

Structural Overview and Morphotectonic Evolution of a Strike-Slip Fault in the Zone of North Almora Thrust, Central Kumaun Himalaya, India

Joshi

Pant

Kotlia

et al. 2016

Journal of Geological Research

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The aim of the present research is to provide the base line details of the NNW-SSE trending Raintoli fault (RF) which is running parallel to the North Almora Thrust (NAT) along the Saryu valley from Seraghat-Naichun to Seri in the central sector of the Uttarakhand Himalaya, India. The RF is characterized as dextral strike slip fault and behaves as a ductile shear zone within the zone of NAT. The dextral sense of shear movement of RF is delineated by the fabric of the shear zone rocks including microscopically observed indicators such as sigma and delta porphyroclasts, quartz c-axis, and the field structural data. Additionally, in the quaternary period the dextral strike slip fault is reactivated with oblique slip component as characterized by various geomorphic indicators, for example, triangular facets, abandoned river channels, unpaired fluvial terraces, and V-shaped valleys with recurrent seismicity. Further, the morphometric parameters including Valley Floor Width to Valley Height (Vf), asymmetry factor (AF), and gradient index (GI) further prove active nature of RF as suggested by low values of hypsometric integration, V-shaped valley, higher gradient index, and tilting of Saryu basin.

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Geomorphologic assessment of relative tectonic activity in the Maharlou Lake Basin, Zagros Mountains of Iran

et al. 2011

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Spatial differences of Quaternary deformation and intensity of tectonic activity are assessed through a detailed quantitative geomorphic study of the fault-generated mountain fronts and alluvial/fluvial systems around the Maharlou Lake Basin in the Zagros Fold-Thrust Belt of Iran. The Maharlou Lake Basin is defined as an approximately northwest-southeast trending, linear, topographic depression located in the central Zagros Mountains of Iran. The lake is located in a tectonically active area delineated by the Ghareh and Maharlou faults. Combined geomorphic and morphometric data reveal differences between the Ghareh and Maharlou mountain front faults indicating different levels of tectonic activity along each mountain front. Geomorphic indices show a relatively high degree of tectonic activity along the Ghareh Mountain Front in the southwest, in contrast with less tectonic activity along the Ahmadi Mountain Front northeast of the lake which is consistent with field evidence and seismotectonic data for the study area. A ramp valley tectonic setting is proposed to explain the tectonosedimentary evolution of the lake.

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Geomorphic assessment of active tectonics in the Acambay graben, Mexican Volcanic Belt

Cited by 40 publications

References 0 publications

Evaluate Tectonic Activity of Tehran City (Iran) Based on Geomorphic Indices, Field Investigation and Remote Sensing Study

Evaluate Tectonic Activity of Tehran City (Iran) Based on Geomorphic Indices, Field Investigation and Remote Sensing Study

Structural Overview and Morphotectonic Evolution of a Strike-Slip Fault in the Zone of North Almora Thrust, Central Kumaun Himalaya, India

Geomorphologic assessment of relative tectonic activity in the Maharlou Lake Basin, Zagros Mountains of Iran

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