| Autor: |
Mostafazadeh, Mehrdad, Mahshadnia, Leila |
| Předmět: |
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| Zdroj: |
Journal of Seismology & Earthquake Engineering; May2021, Vol. 23 Issue 2, p9-30, 22p |
| Abstrakt: |
The study of seismic stress distribution in subduction zones is done from two viewpoints: vector quantity study (purpose of the present study) and numerical quantity, which are important topics in seismology. The structural zone of the Makran, with the accretionary wedge as its main structure, is a kind of incremental wedge located in the hanging wall of a shallow subduction zone. In this study, earthquakes from the Harvard University Seismic Catalog (GCMT) with magnitudes equal to or greater than 5 were used. In the simultaneous inverse solving algorithm, several earthquakes were used and the stress field for different zones was calculated by the inversion method. Results of stress field analysis in the Makran zone, show heterogeneous stress fields throughout the region. Makran zone was divided into nine separate units based on structural morphology and seismic clusters. The inversion solution was performed simultaneously with several earthquakes in Michel's inverse solution algorithm, and the seismic stress field was calculated for each zone by the inversion method separately for depths less than and more than 20 km. The results of the analysis of the stress field in the Makran region show the heterogeneous spatial distribution of stress (horizontal and depth) throughout the region. The obtained stress field was compared with extended faults in each zone and active fault groups were determined. The seismic activity of the Makr an zone and its border with the adjacent tectonic zones is concentrated in several areas, which is probably due to the complex behavior of fault intersections and the interaction between fault systems. Seismic activity is concentrated in the eastern and western borders of Makran and the place where the compressive mechanism of faults (in the fold and thrust area of Makran) is converted to strike-slip regime. Another group of earthquakes occurred at the intersection of fault systems in the center of Makran and between Jazmurian depression and Moshbal, which shows the complexity of the structure at the intersection of the Sistan suture with the Makran thrust system. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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