Investigating the effect of structural and non-structural factors on the vertical changes of the earth's surface with a special look at the subsidence of Bushroyeh and Tabas cities using radar interferometry technique.

Articles in Press

Document Type : Research Article

Authors

1 Department of Geology, Faculty of Basic Sciences, University of Birjand

2 Department of Geology, Faculty of Earth Science, Birjand University, Birjand, Iran,

3 International Institute of Seismology and Earthquake Engineering

4 Faculty of Earth Science, Birjand University, Birjand, Iran

Abstract

The plains of Tabas and Bushroyeh, are located in the western and eastern parts of horst Shotori, respectively. especially around the cities of Tabas and Bushroyeh, which have suffered subsidence during the past few decades. One of the most widely used and least expensive methods in monitoring the vertical changes of the earth's crust (subsidence-uplift) is the radar interferometry technique. It is an effective technique with n extensive coverage in showing the changes in the earth's surface with high resolution. In this research, the plains of Tabas and Bushroyeh were selected in order to determine the pattern of vertical changes and measure its relationship with the main and active structures of the region and the overdrafting from the aquifers of Tabas and Bushroyeh in a 5 years period (2015-2020). In order to determine the relationship between the pattern of vertical changes of the earth's crust and the results of the radar interferometric technique by benefiting from the integration of structural information and the drop in the level of underground water during the desired period of time. The results of this research show that parts of the research area are rising more than 5.2 mm in the direction of the Esfandiar fault, while the subsidence in these unique plains is in two bands with an almost north-south and northwest-southeast direction. More than -37 mm during the desired period. The correlation of the pattern of vertical changes of the earth's crust with the main and active structures of the region shows that these two subsidence bands coincide with the faults identified in the region. Also, correlation measurement of the pattern of vertical changes of the earth's crust with the drop of the underground water level of Tabas and Bushroyeh aquifers shows that the uplift pattern in some areas of the region. In this way, these results show that the pattern of vertical changes in Bushroyeh plain is mostly subject to structural factors. And it is possible to consider the subsidence around the poems of Bushroyeh and Tabas under the influence of structural factors and to a greater extent subject to non-territorial factors such as the lithology of seasonal floods and indiscriminate harvesting and successive droughts. The high rate and range of changes in the western and east part of the Shotori Plateau, especially in folds and young thrust faults, due to the low rate of inter-seismic deformation and the absence of high-magnitude earthquakes in the time period of the interpretation of the images used in this study, is an important non-tectonic reason. The absence of high magnitude earthquakes in the interpretation period of the images used in this study has an important non-tectonic reason. In the region, a very influential factor in the formation of such changes is the occurrence of

severe seasonal floods and the deposition of sediments carried by them in the region.

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Main Subjects

Bulletin of Earthquake Science and Engineering

Articles in Press, Accepted Manuscript
Available Online from 13 May 2024

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History

  • Receive Date: 07 November 2023
  • Revise Date: 28 March 2024
  • Accept Date: 13 May 2024

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