Rayleigh wave group velocity modeling using Simulated Annealing algorithm and gravity data inversion to estimate the variations of Moho depth, shear wave velocity and density structure of the crust and upper mantle in Makran region

Q: How can I download an article?

To download an article from SID, first log in to the site, search for the article title, and click on the 'Download Article' option.

Q: How can I download an ISI article?

To download an ISI article on SID, enter the keyword or article title in the search bar, view the relevant results, click on the desired article, and select the 'Download Article' option.

Q: How can I access the SID database?

To access the SID database, visit SID.ir, create an account, and log in to access scientific resources.

Q: Is downloading articles from SID free?

Some articles on SID are available for free, while others require payment. Details are specified on the article's page.

ABDOLLAHI SOMAYEH; EBRAHIMZADEH ARDESTANI VAHID; ZEYEN HERMANN

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: IRANIAN JOURNAL OF GEOPHYSICS Year:2019 | Volume:12 | Issue:4 Page(s): 31-47

Download Full-Text

Persian Verion

View:

556

Download:

Cites:

Information Journal Paper

Title

Rayleigh wave group velocity modeling using Simulated Annealing algorithm and gravity data inversion to estimate the variations of Moho depth, shear wave velocity and density structure of the crust and upper mantle in Makran region

Author(s)

ABDOLLAHI SOMAYEH | EBRAHIMZADEH ARDESTANI VAHID | ZEYEN HERMANN | Issue Writer Certificate

Keywords

MakranQ1

Moho depthQ2

gravityQ1

shear wave velocityQ1

Simulated Annealing algorithmQ1

Abstract

In this study, Simulated Annealing algorithm is applied on Rayleigh wave group velocities to image the density variations and shear and compressional wave velocities structure of the crust and upper-mantle of Makran subduction zone. Based on previous studies, surface wave dispersion measurements are primarily sensitive to seismic shear wave velocities. However, it has been proved that the sensitivity to compressional wave velocity is significantly smaller than the sensitivity to shear wave velocity. Also the sensitivity function for the density is smaller than the one for the shear wave velocity. Therefore, shear wave velocity variations are mainly the model parameters in surface wave dispersion analysis. Simulated Annealing is a probabilistic technique for finding the global optimum of a given function. It is especially useful to approximate global optimization in a large search space. The Simulated Annealing method like the Monte-Carlo method, samples the whole model space and can avoid getting stuck in local minima. To evaluate calculation efficiency and effectiveness of Simulated Annealing algorithm, two noise-free and two noisy (10% of white Gaussian noise) synthetic data sets are firstly inverted. Then, a real data from Makran region is inverted to examine the applicability and robustness of the proposed approach on real surface wave data. In next step, gravity data inversion was applied with a priori information based on surface wave analysis results to obtain Moho depth variations and crustal density structure. The reason for using gravity data set is that surface waves group velocity is sensitive to average velocity variations and has a good lateral sensitivity, whereas gravity anomaly is sensitive to depth variations of discontinuities and has a good vertical resolution. Our results show that the Moho depth across the Makran subduction zone increases from the Oman seafloor and Makran forearc setting to the volcanic arc. Generally, the crust in the western Makran is thicker than the eastern part and the maximum crustal thickness in the Makran region reaches 46 to 48 km below the Taftan-Bazman volcanos. The Moho map clearly depicts the western edge of the Makran subduction zone, where the Minab fault (representing the eastern edge of the Hormuz Straits) marks the boundary between the thick continental crust of the Arabian plate and the thin oceanic crust of the Oman Sea. Our results show clearly that the high-velocity slab of the Arabian plate subducts northwards beneath the low-velocity overriding lithosphere of Lut block in the western Makran and Helmand block in the eastern Makran.

Cites

No record.

References

No record.

Cite

APA: Copy

ABDOLLAHI, SOMAYEH, EBRAHIMZADEH ARDESTANI, VAHID, & ZEYEN, HERMANN. (2019). Rayleigh wave group velocity modeling using Simulated Annealing algorithm and gravity data inversion to estimate the variations of Moho depth, shear wave velocity and density structure of the crust and upper mantle in Makran region. IRANIAN JOURNAL OF GEOPHYSICS, 12(4 ), 31-47. SID. https://sid.ir/paper/133846/en

Vancouver: Copy

ABDOLLAHI SOMAYEH, EBRAHIMZADEH ARDESTANI VAHID, ZEYEN HERMANN. Rayleigh wave group velocity modeling using Simulated Annealing algorithm and gravity data inversion to estimate the variations of Moho depth, shear wave velocity and density structure of the crust and upper mantle in Makran region. IRANIAN JOURNAL OF GEOPHYSICS[Internet]. 2019;12(4 ):31-47. Available from: https://sid.ir/paper/133846/en

IEEE: Copy

SOMAYEH ABDOLLAHI, VAHID EBRAHIMZADEH ARDESTANI, and HERMANN ZEYEN, “Rayleigh wave group velocity modeling using Simulated Annealing algorithm and gravity data inversion to estimate the variations of Moho depth, shear wave velocity and density structure of the crust and upper mantle in Makran region,” IRANIAN JOURNAL OF GEOPHYSICS, vol. 12, no. 4 , pp. 31–47, 2019, [Online]. Available: https://sid.ir/paper/133846/en

Related Journal Papers