Study of seismic site effects and soil-structure resonance of Bhaktapur District, Nepal using microtremors

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-04-02 DOI:10.1007/s10950-024-10210-x
Chandra Kiran Kawan, Amit Prajapati, Dinesh Sakhakarmi
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Abstract

Bhaktapur city, one of the historical cities of Nepal, is among the old settlements within Kathmandu Valley that were frequently devastated during major earthquakes. Historical evidence clearly states the high seismic vulnerability of Bhaktapur. So, this study characterizes the free field of the Bhaktapur district in terms of periods. For this, the horizontal to vertical (H/V) technique was used to determine the predominant period of the study area, measuring microtremor data at 200 m × 200 m spacing in the core city area, whereas 400 m × 400 m spacing of measurement was done at the outskirts of the city with rare settlement. The spatial distribution map of the predominant period is prepared with the period obtained from 609 measuring points. The map shows that the predominant period ranges from 0.1 to 4 s and then categorized into four different zones—A (0.10–0.6 s), B (0.6–1.0 s), C (1.0–1.7 s), and D (1.7–4.0 s). The central parts of the study areas are spotted with longer periods (1.7–4.0 s), where the density of the dweller is high. The structural period of 28 reinforced concrete buildings was also determined to understand the level of danger of the buildings due to soil-structure resonance. The predominant period of the buildings ranges from 0.12 to 0.42 s. The possibility of soil structure resonance condition is higher for six buildings, medium for two buildings, and low for the rest of the buildings. The results can be applied to urban planning, seismic hazard mitigation, conservation, and restoration of heritage monuments.

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利用微震源研究尼泊尔巴克塔普尔地区的地震场地效应和土壤-结构共振
巴克塔普尔市是尼泊尔的历史名城之一,也是加德满都谷地的古老居民点之一,在大地震中经常遭到破坏。历史证据清楚地表明,巴克塔普尔在地震中非常脆弱。因此,本研究从周期角度描述了巴克塔普尔地区自由场的特征。为此,采用了水平-垂直(H/V)技术来确定研究区域的主要周期,在核心城区以 200 米×200 米的间距测量微震颤数据,而在定居点稀少的城郊则以 400 米×400 米的间距进行测量。利用从 609 个测量点获得的周期绘制了主要周期的空间分布图。从图中可以看出,主要周期从 0.1 秒到 4 秒不等,然后分为四个不同的区域--A 区(0.10-0.6 秒)、B 区(0.6-1.0 秒)、C 区(1.0-1.7 秒)和 D 区(1.7-4.0 秒)。研究区域的中心地带的周期较长(1.7-4.0 秒),那里的居民密度较高。我们还测定了 28 栋钢筋混凝土建筑物的结构周期,以了解土壤-结构共振对建筑物造成的危险程度。建筑物的主要周期从 0.12 秒到 0.42 秒不等。6 栋建筑物发生土壤结构共振的可能性较高,2 栋建筑物为中等,其余建筑物为低。研究结果可应用于城市规划、减轻地震灾害、保护和修复文物古迹。
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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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