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In the present study, the attenuation relationships of horizontal and vertical peak ground acceleration and 5%-damped spectral acceleration, suitable for the northern region of Iran (Alborz Zone), are presented. The dataset contains 308 three-component records from 104 events with moment magnitudes between 4.5 and 7.6 and hypocentral distances from 10 to 200 km. Site conditions of the stations have been classified into two categories, rock and soil. To determine the unknown constants of the relations, one-step nonlinear regression analysis was used. Finally, it was found that the proposed attenuation relationships show good compatibility with a number of past well-known studies.

Attenuation Relationships for Horizontal and Vertical Peak and Spectral Accelerations for Alborz Zone of Iran