Significance of Pulse-Like Ground Motions and Directivity Effects in Moderate Earthquakes: The Example of the Mw 6.1 Gölyaka-Düzce Earthquake on 23 November 2022

IF 2.6 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Bulletin of the Seismological Society of America Pub Date : 2023-10-12 DOI:10.1785/0120230043
Elif Türker, Ming-Hsuan Yen, Marco Pilz, Fabrice Cotton
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引用次数: 2

Abstract

ABSTRACT The 1400 km long North Anatolian Fault Zone in Türkiye runs through numerous densely populated regions, including the city of Düzce that was recently hit by an Mw 6.1 earthquake on 23 November 2022. This was the first moderate event in the region after the devastating Mw 7.2 earthquake in 1999, which cost the lives of over 700 people. Despite its moderate size, the earthquake caused unexpected severe damage to a significant number of buildings, as reported by local institutions (Disaster and Emergency Management Presidency, AFAD). It is well established that ground motions in the near field can lead to increased damage due to near-field domain effects, such as ground-motion pulses and directivity effects (i.e., when the site is aligned with rupture propagation). We examine potential near-field effects using the strong ground motion database of AFAD-Turkish Accelerometric Database and Analysis Systems. To achieve this, we first analyze the behavior of the ground-motion intensities in terms of their spatial distribution and observe higher peak ground velocity than expected by ground-motion models in spatially constrained azimuthal ranges. Furthermore, we find that the majority of the near-fault recordings contain velocity pulses that are primary concentrated on the fault-parallel component. This outcome questions the widely accepted understanding from the previous studies, which mainly suggested that impulsive ground motions that are associated with directivity effects primarily occur on the fault-normal component of large-magnitude events.
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脉状地震动和指向性效应在中震中的意义——以2022年11月23日Mw 6.1 Gölyaka-Düzce地震为例
位于基耶省的北安那托利亚断裂带长达1400公里,穿越了许多人口稠密的地区,包括最近于2022年11月23日发生6.1级地震的d zce市。这是该地区自1999年毁灭性的7.2级地震以来的第一次温和地震,那次地震夺走了700多人的生命。据当地机构(灾害和应急管理局主席)报告,尽管地震规模不大,但对大量建筑物造成了意想不到的严重破坏。众所周知,由于近场域效应,例如地震动脉冲和指向性效应(即,当场地与破裂传播对齐时),近场地震动会导致破坏增加。我们使用afad -土耳其加速度数据库和分析系统的强地面运动数据库来检查潜在的近场效应。为此,我们首先从空间分布的角度分析了地震动强度的行为,并观察到在空间受限的方位范围内,地震动模型的峰值地速度比预期的要高。此外,我们发现大多数近断层记录包含主要集中在断层平行分量的速度脉冲。这一结果质疑了先前研究中广泛接受的理解,这些研究主要表明与指向性效应相关的脉冲地面运动主要发生在大震级事件的断层-正向分量上。
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来源期刊
Bulletin of the Seismological Society of America
Bulletin of the Seismological Society of America 地学-地球化学与地球物理
CiteScore
5.80
自引率
13.30%
发文量
140
审稿时长
3 months
期刊介绍: The Bulletin of the Seismological Society of America, commonly referred to as BSSA, (ISSN 0037-1106) is the premier journal of advanced research in earthquake seismology and related disciplines. It first appeared in 1911 and became a bimonthly in 1963. Each issue is composed of scientific papers on the various aspects of seismology, including investigation of specific earthquakes, theoretical and observational studies of seismic waves, inverse methods for determining the structure of the Earth or the dynamics of the earthquake source, seismometry, earthquake hazard and risk estimation, seismotectonics, and earthquake engineering. Special issues focus on important earthquakes or rapidly changing topics in seismology. BSSA is published by the Seismological Society of America.
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