Seismic site classification based on H/V spectral ratio from strong ground motion records: the urban areas of Bursa province

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-03-15 DOI:10.1007/s10950-024-10206-7
Kaan Hakan Coban
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Abstract

It is known that the site classifications are closely related to the damages caused by earthquakes in areas with increased seismic hazard. Additionally, another important parameter utilized to identify the damage is the Peak Ground Acceleration (PGA) value. While measurements and the GMPE are utilized to identify PGA values, site classification is usually conducted by using the Vs30 value. This study aims to identify the site classifications for Bursa province by using a different approach, namely, the H/V spectral ratio method based on the dominant periods. In this regard, 205 records belonging to 82 earthquakes recorded by 41 strong ground motion stations located in Bursa province were utilized. A mean H/V spectral ratio curve was developed for each station based on the Fourier and response spectra of these earthquake records. Generally, double or multiple peaks resulting from the site structure were observed in the H/V curves. Furthermore, for the station locations, the evaluations were conducted in accordance with the site classifications per the dominant period as it is suggested in the literature. The stations were identified as all of the site classifications suggested by (Zhao et al. Bull Seismol Soc Am 96:914–925, 2006), as SC-1, 2, 3 and 5 suggested by (Fukushima et al. J Earthquake Eng 11:712–724, 2007) and as CL I, II, III, IV and VII suggested by (Di Alessandro et al. Bull Seismol Soc Am 102:680–695, 2012). Additionally, various Spectral Acceleration estimations were made with different GMPE equations for scenario earthquakes, and the results were compared with the design spectra suggested by the Turkish Building Earthquake Code (TBEC 2018). As a result of the study, the H/V spectral curves were generated according to both Fourier and response spectra; using a great number of earthquake data, the hazard was assessed by the soil dominant period-based for the first time in Bursa province.

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基于强地面运动记录的 H/V 频谱比的地震带分类:布尔萨省的城市地区
摘要 众所周知,在地震危险增加的地区,场地分类与地震造成的破坏密切相关。此外,地表加速度峰值(PGA)也是用于确定破坏程度的另一个重要参数。虽然测量和 GMPE 可用于识别 PGA 值,但场地分类通常是通过 Vs30 值进行的。本研究旨在使用一种不同的方法,即基于主要周期的 H/V 频谱比方法,确定布尔萨省的场地分类。为此,研究人员利用了位于布尔萨省的 41 个强地动台站记录的 82 次地震的 205 条记录。根据这些地震记录的傅立叶频谱和响应频谱,为每个台站绘制了一条平均 H/V 频谱比曲线。一般来说,H/V 曲线中会出现由站点结构引起的双峰或多峰。此外,对台站位置的评估是按照文献中建议的主要周期进行的。这些台站被确定为(Zhao 等,Bull Seismol Soc Am 96:914-925, 2006)建议的所有台站分类,(Fukushima 等,J Earthquake Eng 11:712-724, 2007)建议的 SC-1、2、3 和 5,以及(Di Alessandro 等,Bull Seismol Soc Am 102:680-695, 2012)建议的 CL I、II、III、IV 和 VII。此外,还采用不同的 GMPE 公式对情景地震进行了各种频谱加速度估算,并将结果与《土耳其建筑抗震规范》(TBEC 2018)建议的设计频谱进行了比较。研究结果显示,根据傅立叶频谱和响应频谱生成了 H/V 频谱曲线;利用大量地震数据,首次在布尔萨省通过基于土壤主导周期的方法评估了灾害。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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