PRETELL RESEARCH GROUP

SITE RESPONSE FOR VERTICAL SHAKING

Team: Santosh Katuwal, Renmin Pretell

AFliq — Vertical site response for a hypothetical site (Katuwal and Pretell 2026). TF_x and TF_z are the transfer functions for horizontal and vertical shaking, respectively.

SITE RESPONSE MODEL FOR THE CALIFORNIAN SIERRAS

Team: Santosh Katuwal, Renmin Pretell, Ramin Motamed, Jeff Bayless (AECOM), Norman Abrahamson (UC Berkeley)

Vs_TFs — Effect of shear-wave velocity (V_S) profile gradient on site amplification (Katuwal and Pretell 2025) .

LIQUEFACTION EFFECTS ON GROUND MOTIONS

Team: Renmin Pretell, Scott Brandenberg (UCLA), Jonathan Stewart (UCLA)

AFliq — Variation of amplification factor liquefaction (AF_liq) with factors of safety against liquefaction triggering (Pretell et al. 2025) . AF_liq is defined as the ratio of the pseudo-spectral acceleration at ground surface computed considering and neglecting the effect of excess porewater pressure.

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