在土耳其布尔萨尼吕费尔北安纳托利亚断层地震威胁下地震微区划分的重要性

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Güldane Boyraz Bıçakcı , Ferhat Özçep , Savaş Karabulut , Mualla Cengiz
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引用次数: 0

摘要

在南马尔马拉地区的布尔萨中心区中,尼吕费尔区经历了最近的城市化进程,建筑工程迅速完工。自公元前 358 年以来,北安纳托利亚断层(NAF)的分支发生了多次破坏性地震,对布尔萨市附近的建筑物造成了严重破坏和人员伤亡。除了为确定布尔萨附近的土壤行为而进行的一些研究外,尼吕费尔地区的地震危害研究仍然缺乏。因此,我们开展了一项微区研究,包括以下步骤。首先,我们进行了地震危害分析,并确定了预期地震的峰值地面加速度 (PGA) 值。接下来,我们对尼吕费尔区 28 个社区 54 个点的 MASW(多通道地表波分析)测量结果进行了评估。在 11 个钻孔中测定了土壤力学参数,以评估液化潜力。结果发现,仅从易损性指数(Kg)来看,几乎一半的研究区域受损程度较低,而易损性指数则取决于场地效应。因此,除 Kg 值外,我们还利用土壤液化、沉降、地下水位变化和频谱加速度平均值的结果绘制了微区图。研究区域被划分为从低到高的四个破坏等级。仅使用 Kg 指数无法量化研究区域的潜在破坏等级,因此我们发现阿尔特恩谢赫尔、希波德罗姆、于吕恩吕和阿拉丁贝、埃尔图鲁尔、29 Ekim、23 Nisan、Ahmetyesevi 和 Minareliçavuş 等地区被确定为潜在的高风险破坏区。这项研究的结果清楚地表明,考虑 Kg 指数(该指数仅取决于当地的影响)可能会导致不适当的破坏值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Importance of seismic microzonation under the threat of an earthquake of the north anatolian fault in nilüfer, bursa, turkiye

The Nilüfer district experienced the most recent urbanization among the central districts of Bursa in South Marmara region with the completion of rapid construction. Since 358 BCE, many destructive earthquakes were reported on the branches of the North Anatolian Fault (NAF) which caused extensive damage to buildings and loss of life near Bursa city. Besides some studies conducted to define the soil behavior in the vicinity of Bursa, a seismic hazard study in Nilüfer is still lacking. We, therefore, carried out a microzonation study including the following steps. First, an earthquake hazard analysis was conducted and the peak ground acceleration (PGA) values were determined for an expected earthquake. In the next step, MASW (Multi-Channel Analysis of Surface Wave) measurements conducted at 54 points in 28 neighbourhoods of Nilüfer district were evaluated. Soil mechanical parameters were determined at 11 boreholes to assess the liquefaction potential. It was found that almost half of the study area suffers from low damage considering only the vulnerability index (Kg) index, which depends on the site effect. Therefore, in addition to the Kg values, we created a microzonation map using the results of soil liquefaction, settlement, changes in groundwater level, and the average values of spectral acceleration. The study area is classified by four damage levels changing from low to high. Using only the Kg index could not quantify the potential damage level in the study area, thus we showed that the districts of Altınşehir, Hippodrome, Ürünlü and Alaaddinbey, Ertuğrul, 29 Ekim, 23 Nisan, Ahmetyesevi and Minareliçavuş were identified at potentially high-risk damage zones. The results of this study clearly showed that considering the Kg index, which depends only on the local site effect, may lead to inadequate damage values.

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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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