The Relationship between Tectonic Activity and Its Impact on Land Subsidence in the Jovein Basin

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Farzinkia Robabeh; Zanganeh Asadi Mohammad Ali; AMIRAHMADI ABOLGHASEM; Zandi Rahman

Title

The Relationship between Tectonic Activity and Its Impact on Land Subsidence in the Jovein Basin

Author(s)

Farzinkia Robabeh | Zanganeh Asadi Mohammad Ali | AMIRAHMADI ABOLGHASEM | Zandi Rahman | Issue Writer Certificate

Keywords

Subsidence

duality

Morphotectonics

Radar Interferometric

Joveyn Plain

Abstract

Introduction: Today, the phenomenon of land Subsidence is one of the most important geomorphologic hazards on a global scale, causing a great deal of damage to urban and rural construction. According to the UNESCO definition, "Subsidence is the collapse or land leveling that occurs due to different large and small scale causes" (Amir Ahmadi et al., 2013: 2). Pourkhosravani et al, (2012) Only with radar interferometer technique studied the geometry of duality, The results of this study showed that, firstly, citing excessive productivity of underground waters is not the main reason for the Subsidence phenomenon; secondly, the phenomenon of Subsidence in Iran's plains is the result of a duality in the crustal motions between the plains and adjacent mountains. In this research, the tectonic indexes and radar interferometry technique have been used with regard to the data and information available to detect the tectonic activity of the area. Methodology: In order to investigate the state of activity of the newly tectonic area, topographic maps of 1: 50000 and 1: 10000 map of geology and radar images are used in the earthquake discussion from USGS US from 1923 to 2018. Also, to study the Subsidence of the Joveyn area, the satellite Sentinel-1A satellite radar data for 2017 and 2018 was used in Canada and processed by SNAP software. The resources used in this research were based on library studies and surveys, topographic maps and radar images and field surveys. Discussion and results and findings: The results of the used Indicators, earthquake zoning and radar interference are defined in the research as follows: River Gradient Index) SL): This index was first presented by Hack (1973), in the study of the role of rock resistance on water flow in the Appalachian Mountains in the southeast of America as numerical values of the river gradient index Table1). Table(1): River Gradient Index)SL) High Δ H(m) Δ L(m) Lsc(m) Sl Condition 1200-1300 100 14769 32050 217 low 1100-1200 100 15814 67170 424 medium 1000-1100 100 29798 122931 412 medium-Asymmetric index(AF): In this calculation, the obtained numbers (33. 7) of the basin showed that the value of the index is less than 50. Therefore, we have the tectonic activity on the left side of the main stream and we face the Subsidence phenomenon on the right.-Reverse topographic symmetry index: (T) to calculate this index in the Joveyn basin, a section has been created in each sub-area and its value has been calculated. According to (table 2), the index value in all three sub-basins is less than 1, indicating the asymmetry and active tectonics in the whole basin. Table (2): Reverse topographic symmetry index Route Da(km) Dd(km) T Condition 1 18/43 21/33 0/86 active 2 15/38 16/91 0/9 active 3 14/53 16/78 0/86 active-Hypsometric and Hypsometric Integral Curves In the hypsometry integral, the numerical value has a value of 0. 5 in the range of young to adult topography. Mountain Sinocity Index: (Smf) Table (3): Mountain Sinocity Index shape LMF LS S Condition 1 26/94 12/34 2/18 Semi active 2 41/86 11/85 3/5Semi active 3 33/05 18/72 1/76 active 4 46/02 23/04 1/99 active-Sinocity index of the river: (S) According to the calculations, the index of the main bend and bend of the main river is less than 1. Which represents the new activities in the region.-Valley Depth Wide Index (VF): In passive regions, the average value of this indicator is usually higher than 7 in terms of over-rupture (Ranjbar Manesh, 2013). Table(4): Valley Depth Wide Index Condition Vf Vfw Eld Erd Esc number active 1. 3 629 2057 2110 1604Figure 1 active 0. 8 127 1408 1498 1307 Figure 2 active 0. 8 73 1354 14241301 Figure 3 active 1. 6 220 1534 1684 1475 Figure 4 active 2 148 1505 1481 1421 Figure 5 active 1. 2 127 1545 1527 1437 Figure 6 active 0/2 87 2324 2115 1877 Figure 7 Radar Interferometric results According to this map, the maximum Subsidence rate in the study area in 2017 and 2018 will be 6. 4 and 5. 6 respectively. Regarding the maps drawn on this plain with radar interferometry, both indicate the Subsidence of the plain. The analysis of plain radar data shows that the highest elevation in the joghatay heights, and the highest Subsidence level, occurred on the Joveyn Plain floor. Conclusion Although most scholars consider untreated groundwater to be an important factor in groundwater depletion and the plains of Iran, the role of tectonic factors in exacerbating this phenomenon should not be overlooked. In a study conducted by Purkhosrovani et al. On the causes of the Subsidence, only Duval's discussion of radar interferometry was discussed without examining tectonic indices. In this study, in addition to radar interferometry, the tectonic status of the basin was also investigated. For this purpose, geomorphic indices such as watershed shape, drainage basin asymmetry index, inverse topographic symmetry index, mountain front sinusoidal index, hipsometry integral, valley floor height to its height, river sine index, river gradient index, gradient index They offer some of the activities of the area's baby boomers. Among the morphotectonic indices that all indicate tectonic activity in the region, the VF index in the region was less than 2, which by standards is below 6 in this index indicating rising areas. Subsidence caused by tectonic movements occurs when there are two faults, graben and upwelling, and relative movement of parts causes Subsidence. The fault status of the area in the southern and northern parts of the region has placed the plain in the graben position. Statistical analysis also showed that the earthquake of 1923 occurred with a magnitude of 6. 4 MS. The future activity of these faults may affect the area. The active morphotectonic conditions of the basin, also showed the results of radar interferometry, in the southern part with higher elevation, parallel to Subsidence in the plain. The existence of this scouring and its appearance on the radar interferometer map indicates the tectonic activity in the southern ranges of the study area. These results indicate a significant relationship between the Subsidence and its lateral elevations, suggesting that these two movements are dual. Based on the above arguments, it can be concluded that one of the factors affecting the Subsidence of the Earth in the juvenile plain is due to its soft crustal motions even in equilibrium. Due to the geomorphic hazards of the basin, it is necessary to prepare a zoning map of the area for development activities and land preparation based on which control, protection, prevention or warning measures will be taken.

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APA: Copy

Farzinkia, Robabeh, Zanganeh Asadi, Mohammad Ali, AMIRAHMADI, ABOLGHASEM, & Zandi, Rahman. (2019). The Relationship between Tectonic Activity and Its Impact on Land Subsidence in the Jovein Basin. HYDROGEOMORPHOLOGY, 5(20 ), 165-185. SID. https://sid.ir/paper/382155/en

Vancouver: Copy

Farzinkia Robabeh, Zanganeh Asadi Mohammad Ali, AMIRAHMADI ABOLGHASEM, Zandi Rahman. The Relationship between Tectonic Activity and Its Impact on Land Subsidence in the Jovein Basin. HYDROGEOMORPHOLOGY[Internet]. 2019;5(20 ):165-185. Available from: https://sid.ir/paper/382155/en

IEEE: Copy

Robabeh Farzinkia, Mohammad Ali Zanganeh Asadi, ABOLGHASEM AMIRAHMADI, and Rahman Zandi, “The Relationship between Tectonic Activity and Its Impact on Land Subsidence in the Jovein Basin,” HYDROGEOMORPHOLOGY, vol. 5, no. 20 , pp. 165–185, 2019, [Online]. Available: https://sid.ir/paper/382155/en

Scientific Information Database

ISSN: 2588-4824

Journal Paper

The Relationship between Tectonic Activity and Its Impact on Land Subsidence in the Jovein Basin