Skip to main content

ORIGINAL RESEARCH article

Front. Earth Sci.
Sec. Geohazards and Georisks
Volume 12 - 2024 | doi: 10.3389/feart.2024.1434194
This article is part of the Research Topic Prevention, Mitigation, and Relief of Compound and Chained Natural Hazards Volume II View all 3 articles

Empirical Relationships between Arias Intensity and Peak Ground Acceleration for western China

Provisionally accepted
Jia M. Liu Jia M. Liu 1*Bin Zhang Bin Zhang 2Xu D. Zhao Xu D. Zhao 1
  • 1 Institute of Geomechanics, Chinese Academy of Geologi­cal Sciences (CAGS), Beijing, China
  • 2 Institute of Earthquake Forecasting, China Earthquake Administration, Beijing, China

The final, formatted version of the article will be published soon.

    We establish empirical relationships for Arias Intensity (AI) and peak ground acceleration (PGA) for western China, utilizing 3169 horizontal and 979 vertical strong motion records with PGA ≥ 0.01g from 274 earthquakes (M S 4.0-8.0), originating in eight provinces in southwest (Yunnan, Sichuan) and northwest China (Gansu, Shaanxi, Ningxia, Qinghai, Inner Mongolia, and Xinjiang). The influences of M S and epicenter distance are validated. The dependence on V S30 and generic site classes (i.e. rock and soil) is explored. The results confirm that the logarithm of AI increases linearly with the increase of the logarithm of PGA and M S , and decreases with the logarithm of V S30 . However, the influence of site conditions on AI-PAG relationships can't be recognized by the simple generic rock and soil site classes. The epicenter distance has little effect on the AI-PAG relationships. Empirical relationships are developed to estimate horizontal or vertical AI as a function of PGA (basic model), PGA and M S (model 2) for southwest, northwest, and western China, using all the records. Empirical relationships for AI as a function of PGA, M S , and V S30 (model 1) are established using the 2248 horizontal (70.9% of the total) and 670 vertical (68.4% of the total) records with V S30 . The notable disparity between model 1 of the southwest and northwest regions indicates that the AI-PGA correlation is region-dependent. This region-dependent effect is chiefly attributed to local site conditions. We consider our new models to be applicable for M S ranging from 4.0 to 8.0, V S30 between 148 and 841m/ s and PGA ≥ 0.01g. They enable one way of estimating AI from PGA for western China and will also enhance the understanding of AI attenuation.

    Keywords: Arias intensity, peak ground acceleration, conditional model for Arias Intensity, Empirical correlations, Western China

    Received: 17 May 2024; Accepted: 24 Jun 2024.

    Copyright: © 2024 Liu, Zhang and Zhao. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Jia M. Liu, Institute of Geomechanics, Chinese Academy of Geologi­cal Sciences (CAGS), Beijing, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.