← Back to Sessions

Toward a Radially and Azimuthally Anisotropic Adjoint Model for the Middle East

Description: 

After our transversely isotropic adjoint model of the Middle East, MEAD-M20, which is a result of 20 conjugate-gradient iterations and shows promising results to improve moment tensor solutions in the region, we continue our iterations by including azimuthal anisotropy in parameterization. Similar to MEAD-M20 we use publicly available seismic data from EarthScope and local networks, such as Kandilli Observatory, and proprietary data from Saudi Geological Survey, Iraqi Seismic Observatory, Iranian Seismological Center through our collaborations. We have made our multitaper traveltime measurements in two period bands within the range of 30-100 s using Rayleigh and Love waves where we will gradually decrease the shorter period to better constrain the crustal structure. Moreover, we will include double-difference multitaper traveltime measurements to achieve higher-resolution underneath densely covered regions combined with multi-scale smoothing of the gradient. At this stage, we use Rayleigh and Love waves for transversely isotropy by updating vertically (βv) and horizontally (βh) polarized shear waves and the anisotropic parameter (η), while we only use Rayleigh waves for azimuthal anisotropy (2θ term) by updating normalized anisotropic parameters Gc' and Gs'. We have performed 3 iterations so far where the initial results of azimuthal anisotropy is consistent with plate motions. At the second stage, our goal is to include the 4θ term in our inversions as well. We will present our new model and discuss our observations in the context of the region’s tectonics, geodynamics and its contribution to improving source parameters.

Session: Earth’s Structure from the Crust to the Core [Poster]

Type: Poster

Date: 4/16/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Ebru

Student Presenter: No

Invited Presentation: 

Poster Number: 90

Authors