Ranking and developing ground-motion models for Southeastern Africa

IF 3.1 2区 工程技术 Q2 ENGINEERING, CIVIL
Joanna M Holmgren, Maximilian J Werner, Katsuichiro Goda, Manuela Villani, Vitor Silva, Patrick Chindandali
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引用次数: 0

Abstract

The southern East African Rift System (EARS) is an early-stage continental rift with a deep seismogenic zone. It is associated with a low-to-moderate seismic hazard, but due to its short and sparse instrumental record, there is a lack of ground-motion studies in the region. Instead, seismic hazard assessments have commonly relied on a combination of active crustal and stable continental ground-motion models (GMMs) from other regions without accounting for the unusual geological setting of this region and evaluating their suitability. Here, we use a newly compiled southern EARS ground-motion database to compare six active crustal GMMs and four stable continental GMMs. We find that the active crustal GMMs tend to underestimate the ground-motion intensities observed, while the stable continental GMMs overestimate them. This is particularly pronounced in the high-frequency intensity measures (>5 Hz). We also use the referenced empirical approach and develop a new region-specific GMM for southern EARS. Both the ranked GMMs and our new GMM result in large residual variabilities, highlighting the need for local geotechnical information to better constrain site conditions.
非洲东南部地动模型的排序和开发
东非大裂谷系统(EARS)南部是一个具有深地震带的早期大陆裂谷。它具有中低度地震危险,但由于其时间短、仪器记录稀少,该地区缺乏地动研究。相反,地震灾害评估通常依赖于其他地区的活动地壳和稳定大陆地动模型(GMMs)的组合,而没有考虑到该地区不同寻常的地质环境并评估其适用性。在这里,我们使用新编制的南部 EARS 地动数据库,比较了六个活动地壳 GMM 和四个稳定大陆 GMM。我们发现,活动地壳 GMMs 往往低估了观测到的地动强度,而稳定大陆 GMMs 则高估了地动强度。这在高频强度测量(5 赫兹)中尤为明显。我们还使用了参考的经验方法,并为 EARS 南部开发了一种新的特定地区 GMM。排序的 GMM 和我们的新 GMM 都会产生较大的残差,这突出表明需要当地的岩土工程信息来更好地约束现场条件。
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来源期刊
Earthquake Spectra
Earthquake Spectra 工程技术-工程:地质
CiteScore
8.40
自引率
12.00%
发文量
88
审稿时长
6-12 weeks
期刊介绍: Earthquake Spectra, the professional peer-reviewed journal of the Earthquake Engineering Research Institute (EERI), serves as the publication of record for the development of earthquake engineering practice, earthquake codes and regulations, earthquake public policy, and earthquake investigation reports. The journal is published quarterly in both printed and online editions in February, May, August, and November, with additional special edition issues. EERI established Earthquake Spectra with the purpose of improving the practice of earthquake hazards mitigation, preparedness, and recovery — serving the informational needs of the diverse professionals engaged in earthquake risk reduction: civil, geotechnical, mechanical, and structural engineers; geologists, seismologists, and other earth scientists; architects and city planners; public officials; social scientists; and researchers.
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