EXSIM 在双角频源模型解释地震的地动模拟中的改进

IF 2.9 3区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
Wanjun Ma, Zhinan Xie, Lei Fu, Zhendong Shan, Jianqi Lu, Lihua Tang, Xubin Zhang
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引用次数: 0

摘要

随机扩展有限断层地动模拟算法(EXSIM)已被广泛应用于模拟和预测宽带强地动。然而,越来越多的研究人员发现,对于一些大震级地震和/或推力地震,EXSIM 可能会高估低频地动。尽管存在争议,但双角频率模型目前已被接受为远场震源模型的主要类别之一。本研究通过展示 EXSIM 生成的地震运动与 EXSIM 的点源版本 SMSIM(采用 ω 方形单角频率模型)生成的地震运动之间的等效性,证明 EXSIM 对双角频率源模型解释的地震的适用性有限。此外,还对 EXSIM 提出了两点改进建议:(a) 加入表面分布应力下降复合断层模型;(b) 将 EXSIM 与提出的模型混合应用。通过比较 EXSIM 生成的地震运动和 2013 年 6.7 级芦山推力地震的地面运动记录,验证了这两项改进的效果。值得注意的是,高、低频段以及远、近场都实现了一致的模拟精度。改进后的 EXSIM 在模拟高频和低频地动时具有一致的精度,这使其能够直接、独立地应用于宽带地动模拟。此外,EXSIM 在近场和远场情况下的一致精度首次得到验证,进一步加强了其在地震工程实践中的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Improvements to EXSIM in Ground Motion Simulation for Earthquakes Explained by Double-Corner-Frequency Source Model

Improvements to EXSIM in Ground Motion Simulation for Earthquakes Explained by Double-Corner-Frequency Source Model

The stochastic EXtended finite-fault ground-motion SIMulation algorithm (EXSIM) has been widely applied in simulating and predicting broadband strong ground-motion. However, an increasingly number of researchers have found that EXSIM may overestimate ground-motions at low frequencies for some large-magnitude earthquakes and/or thrust earthquakes, for which the far-field source model has been explained by a double-corner-frequency model. Despite controversy, the double-corner-frequency model is now being accepted as one of the main categories of the far-field source model. This study demonstrated the limited applicability of EXSIM to earthquakes explained by the double-corner-frequency source model, by presenting the equivalence between motions generated by EXSIM and those generated by EXSIM's point-source version, SMSIM, which adopts the ω-square single-corner-frequency model. Furthermore, two improvements to EXSIM have been proposed: (a) the incorporation of the asperity-distributed stress-drop compound faults model and (b) the hybrid application of EXSIM with the proposed model. The effects of the two improvements have been verified by comparing EXSIM-generating motions with recorded ground-motions for the 2013 Mw 6.7 Lushan thrust earthquake. Significantly, consistent simulation accuracy has been achieved across high- and low-frequency bands as well as in far- and near-fields. The consistent accuracy of the improved EXSIM in simulating high- and low-frequency ground motions enables its direct and independent application to broadband ground motion simulations. Moreover, the first validation of this consistent accuracy in both near- and far-field scenarios further enhances its application in earthquake engineering practices.

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来源期刊
Earth and Space Science
Earth and Space Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
5.50
自引率
3.20%
发文量
285
审稿时长
19 weeks
期刊介绍: Marking AGU’s second new open access journal in the last 12 months, Earth and Space Science is the only journal that reflects the expansive range of science represented by AGU’s 62,000 members, including all of the Earth, planetary, and space sciences, and related fields in environmental science, geoengineering, space engineering, and biogeochemistry.
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