Inversion of Source Parameters, Attenuation and Site Response

Generalized Inversion Theory

To gain new insights into the ground-motion phenomenon in New Zealand, I led the efforts to decompose over two decades of seismicity data from 2000 to 2021. We apply a non-parametric generalized inversion technique in the Fourier domain to isolate the systematic source, path, and site effects from 20, 813 seismograms of 1200 shallow crustal events (Mw>3) recorded by 693 sensors at 439 unique localities.

Zhu, C., S. Bora, B. A. Bradley, D. Bindi (2024). Spectral Decomposition of Ground Motions in New Zealand using the Generalized Inversion Technique. Geophysical Journal International, https://doi.org/10.1093/gji/ggae16   

Non-Ergodic Analysis

Velocity and attenuation of the subsurface vary in 3D space. Refined modeling of velocity and attenuation structures could lead to better characterization of site-response and source effects. I, with my collaborators,  have been working on non-ergodic analysis of ground motions.

Chuanbin Zhu, Brendon Bradley, et al. (202x). Lateral Variation in Anelastic Attenuation in New Zealand from Single-Path Inversion (in preparation).