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Influence of Local 3-D Structure at Degelen Test Site on Short-Period Teleseismic P-Wave via Reciprocal Hybrid Modeling

Description: 

The large historical Blacknest Kazakhstan dataset, including underground nuclear tests conducted at the Degelen test site, provides a valuable resource for exploring how structural effects in the immediate vicinity of the source are carried over at teleseismic distances.

It shows significant differences in the recorded waveforms across four arrays (EKA, GBA, WRA, YKA), up to 2 Hz frequency. The rugged topography of the Degelen mountain range and its heterogenous crust should serve as a marker for source parameters identification (location, depth, magnitude), through the scattering of the incident P-wave at the free surface.

We investigated these source properties using a hybrid modeling methodology to simulate the the teleseismic wavefield between the Degelen region and the 4 arrays. It is based on a reciprocal coupling of the DSM solver, for the 1-D Earth background wavefield, and the SEM solver, for the 3-D complex Degelen area. This coupling approach ensure the generation of full Green tensor waveforms throughout the Degelen area and accurate up to 2 Hz frequency.

Session: Advancements in Forensic Seismology and Explosion Monitoring [Poster Session]

Type: Poster

Date: 5/2/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Gael

Student Presenter: No

Invited Presentation: 

Authors