Evaluating current-day vertical deformation in the North Tehran transpressional zone using global positioning system and precise leveling data

Authors

1 PhD student, Department of Geology, Faculty of Science, Golestan University, Gorgan, Iran

2 Dept. Of Geology-Faculty of sciences- Golestan University- GOLESTAN Prov.

3 Geodesy and Land Surveying Department , Iran National Cartographic Center, Tehran, Iran

Abstract

Today, geodetic techniques play a significant role in analyzing and estimating the current-day rate of deformation in different tectonic settings of the earth. In this research, using GPS and precise leveling data, the current-day vertical deformation of the North Tehran structural zone, located in the southern central Alborz has been evaluated. The processing and analysis of the data obtained from the Iranian permanent GNSS Network (IPGN) stations shows a clear uplift throughout this structural zone. The western parts of the North Tehran structural zone have a higher uplift rate than the more eastern areas. In contrast, the loading caused by the thrust sheets in this transpressional zone has caused a significant reduction in the rate of uplift and even subsidence of the southern areas in the Tehran foreland. The time series analysis of IPGN data also indicates that the tectonic regimes, the stresses on the region and the deformations resulting from them have been changing over time, so that it can be said that the phenomenon of inversion tectonics has occurred in the region. The analysis of precise leveling data also indicates that the maximum uplift rate is observed around the main faults of the region with dominant thrust mechanism where sometimes have formed pop-up structures. The integration of GPS and precise leveling data shows that the rate of uplift from the North Tehran Fault towards the north shows a decreasing trend.

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Advanced Applied Geology
Volume 15, Issue 1
In progress
March 2025

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