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Full-Waveform Inversion of the Upper Mantle Beneath the Arabia-Eurasia Collision Zone

Description: 

Despite being one of the most recent major orogenic events, the timing of the Arabia-Eurasia collision is still debated. Much of the discrepancy arises due to uncertainties over the amount of continental subduction of the Arabian passive margin and the timing of a hard collision of cratonic Arabian lithosphere with Eurasia. However, subducted continental lithosphere and underthrusted cratons can be imaged using high resolution seismic tomography, as has recently been demonstrated in the Himalayan region (Liu, 2023). In this study, we perform a full waveform inversion of mantle structure beneath the Turkish-Iranian plateau, using regional earthquakes, which have good horizontal and vertical resolution in the upper mantle. We use a normalized cross-correlation misfit function, which fits both the phase and relative amplitude of multi-path arrivals (Tao et al., 2017). This allows us to extract additional information from complex triplicated waves that provide good coverage of the upper mantle. We present preliminary results of our model of upper mantle structure beneath the Middle East and use it to test different tectonic scenarios for the Arabia-Eurasia collision.

References:

Liu, C. (2023). Constraining East Asia Tectonics From Full Waveform Seismic Tomography (PhD Thesis). The University of Texas at Austin. Tao, K., Grand, S. P., & Niu, F. (2017). Full-waveform inversion of triplicated data using a normalized-correlation-coefficient-based misfit function. Geophys. J. Int., 210, 1517–1524.

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

Type: Poster

Date: 5/2/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Edward

Student Presenter: Yes

Invited Presentation: 

Authors