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Region-specific Empirical Models for Arias Intensity, Cumulative Absolute Velocity, and Significant Duration in the Alborz Region

Description: 

New ground-motion models (GMMs) are developed for significant duration (D5–75 and D5–95), Arias intensity (IA), and cumulative absolute velocity (CAV) using the referenced empirical method (REM) introduced by Atkinson (2008). The models are calibrated using a strong-motion dataset from the Alborz region of northern Iran. Existing GMMs by Sandıkkaya and Akkar (2017) for D5–75 and D5–95, and by Campbell and Bozorgnia (2019) for IA and CAV, are adopted as reference models.

Residuals are computed as differences between the logarithms of observed values and corresponding predictions from the reference GMMs. A mixed-effects regression framework is applied to derive region-specific correction factors that adjust the reference models for Alborz conditions. The resulting GMMs adopt a simple functional form in terms of moment magnitude (Mw), Joyner–Boore distance (Rjb), and time-averaged shear-wave velocity (V_S30). Model performance is evaluated through comparisons with observed data, existing GMMs, and detailed residual analyses.

The results indicate good agreement with observations, and the between-event, between-station, and event–site corrected residual components show no systematic bias or trends with respect to Mw, V_S30, or R_jb. The dataset comprises 775 acceleration records from 167 earthquakes recorded at 309 stations between 1976 and 2020, spanning ranges of 3.0 ≤ Mw ≤ 7.4 and 1 km < Rjb < 160 km.

Session: Advancing Seismic Hazard and Risk Assessment through Multi-Disciplinary Approaches [Poster]

Type: Poster

Date: 4/15/2026

Presentation Time: 08:00 AM (local time)

Presenting Author: Shima Pakniat

Student Presenter: Yes

Invited Presentation: 

Poster Number: 46

Authors