基于水平与垂直谱比(HVSR)方法的西帕卢湾海岸线地震易损性分析

None Amirudin, Iktri Madrinovella, None Sofian
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引用次数: 0

摘要

本研究绘制了优势频率(f0)、放大因子(A0)、地震敏感性指数(Kg)、Vs30、沉积层厚度(H)和峰值地面加速度(PGA)的分布图。微震测量采用TDL-303S型三分量地震仪,测点多达27个。采用水平与垂直光谱比(HVSR)方法对数据进行分析。参考2018年9月28日的帕鲁-东加拉地震,使用Kanai方程进行PGA计算。结果表明:主导频率值(f0)分布范围为0.4149 Hz ~ 0.8869 Hz,土壤放大因子(A0)分布范围为2199 ~ 4884,地震易损性指数(Kg)分布范围为8.79 s2/cm ~ 41.41 s2/cm, 30 m纵深横波速度(Vs30)分布范围为197.7 m/s ~ 320.2 m/s;利用烈度(MMI) VI ~ VII的Mw 7.4级地震,确定了金奈地区的沉积层厚度为260.3 m ~ 291.1 m,峰值地加速度(PGA)为137.3 gal ~ 234.2 gal。West Palu bay的沿海地区具有中等地震易损性II到高地震易损性IV,因此在发生地震灾害时将非常脆弱。脆弱性指数较高的地区位于西部上部和最东部地区,而脆弱性指数较低的地区往往脆弱性指数较低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seismic Vulnerability Analysis Using the Horizontal to Vertical Spectral Ratio (HVSR) Method on the West Palu Bay Coastline
This research was carried out to make a map of the dominant frequency (f0), amplification factor (A0), seismic susceptibility index (Kg), Vs30, Sediment Layer Thickness (H) and Peak ground acceleration (PGA). Microtremor measurements were carried out with a three-component seismometer of the TDL-303S type as many as 27 measurement points. The data was analyzed by the Horizontal to Vertical Spectral Ratio (HVSR) method. The PGA calculation was carried out using the Kanai equation with a reference to the Palu-Donggala earthquake on September 28, 2018. The results showed that the distribution of the dominant frequency value (f0) ranged from 0.4149 Hz-0.8869 Hz, the soil amplification factor (A0) ranged from 2,199–4,884, the seismic vulnerability index (Kg) ranged from 8.79 s2/cm-41.41 s2/cm, the shear wave velocity to a depth of 30 meters ( Vs30) ranged from Vs30 197.7 m/s-320.2 m/s , the thickness of the sedimentary layer ranges from 260.3 m-291.1 m and the peak ground acceleration (PGA) of Kanai ranges from 137.3 gal – 234.2 gal by using Mw 7.4 earthquakes with an intensity scale (MMI) VI to VII. The coastal area of West Palu bay has an intermediate seismic vulnerability II to a high seismic vulnerability IV so that it will be vulnerable in the event of an earthquake disaster. Areas that have a very high vulnerability index are in the upper western and easternmost regions while those with a lower level tend to have a lower vulnerability index value.
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