Characteristics of Strong Ground Motions in the 30 October 2020, MW6.9 Aegean Sea Earthquake
Characteristics of Strong Ground Motions in the 30 October 2020, MW6.9 Aegean Sea Earthquake
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DOI：
10.3389/fbuil.2022.870279
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
Fatma Sevil Malcioglu;Aisling O'Kane;Kokcan Donmez;Y. Aktas
中科院分区：
文献类型：
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作者：
Fatma Sevil Malcioglu;Aisling O'Kane;Kokcan Donmez;Y. Aktas
爱琴海东部地区于2020年10月30日11：51：27 UTC发生破坏性6. 9级地震。地震使萨摩斯岛北方海岸和伊兹密尔南部海岸之间爱琴海的一个东西走向的正断层破裂，并在整个地区引发了一场中等级别的海啸和数千次余震。地震造成119人死亡，1，051人受伤，许多建筑物倒塌。地震最具灾难性的后果发生在Bayrakl和Bornova区，这两个区建在离主震震中约60-70公里的深冲积盆地上。本文解释了破坏与广泛的地震记录的主震和余震，这是由希腊和土耳其网络提供的数据集。一组地震动参数，如峰值纵坐标，谱量，强度措施和持续时间参数的计算和分析。在萨摩斯岛最近的软土站产生最高的峰值地面加速度和速度。该地区普遍采用的地面运动模型高估了超过60-70公里的Joyner-Boore距离的观测数据，除了最近出版的本地地面运动模型，它利用当地地震模型的推导。与预期相反，硬土记录表现出相当大的频谱加速度在长周期区域，类似于那些在软土。计算的地面运动参数与地震工程现场调查小组（EEFIT）组织的混合侦察使命的结果相关。虽然峰值和有关强度的措施清楚地突出了在土壤条件的变化，在最受损害的地区（Bayrakl和Bornova），基于速度的地面运动参数似乎是更敏感的损害指标。伊兹密尔盆地归一化反应谱的谱形与2018年土耳其地震规范谱不兼容，而其反应谱低于过时和现行土耳其地震规范中提供的475年重现期设计谱。
The eastern parts of the Aegean Sea were struck by a destructive MW 6.9 earthquake on 30 October 2020 at 11:51:27 UTC. The earthquake ruptured an East-West trending normal fault in the Aegean Sea between the northern coast of Samos Island and the southern coast of İzmir and also triggered a medium level tsunami and thousands of aftershocks across the region. 119 fatalities, 1,051 injuries, and many collapsed buildings were reported due to the earthquake in the affected region. The most catastrophic consequences of the earthquake were registered in the Bayraklı and Bornova districts, which are built on a deep alluvial Basin approximately 60–70 km away from the epicentre of the mainshock. This paper explains the damage with an extensive dataset of ground motion records of the mainshock and aftershocks, which are provided by both Greek and Turkish networks. A set of ground motion parameters such as peak ordinates, spectral quantities, intensity measures and duration parameters are calculated and analysed. The closest softer soil station in Samos Island produces the highest peak ground acceleration and velocity. The ground motion models employed commonly for the region overestimate the observed data beyond 60–70 km of Joyner-Boore distance except for the recently published local ground motion model, which utilises local earthquakes in the derivation of the model. Contrary to expectations, stiff soil recordings exhibit considerable spectral accelerations in the long period region, similar to those in soft soils. The calculated ground motion parameters are correlated with the results of the hybrid reconnaissance mission, organized by the Earthquake Engineering Field Investigation Team (EEFIT). Although the peak values and regarded intensity measures clearly highlight the variability in soil conditions in the most damaged area (Bayraklı and Bornova), velocity-based ground motion parameters seem to be the more responsive damage indicators. The spectral shapes of the normalised response spectra in the İzmir Basin are not compatible with the 2018 Turkish seismic code spectrum whereas their response spectra are below the 475-years return period design spectra provided in outdated and current Turkish seismic codes.