IDENTIFIKASI ZONA BAHAYA GEMPA BUMI BERDASARKAN PERCEPATAN TANAH MAKSIMUM DI KOTA SEMARANG

Indonesian Journal of Environment and Disaster Pub Date : 2022-10-20 DOI:10.20961/ijed.v1i2.428

Sorja Koesuma, Viola Fajrin, Bambang Sunardi

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Abstract

Semarang City as the Capital of Central Java Province requires an earthquake-prone map. It is required since there are two active faults in Semarang, namely the Semarang fault (part of the Baribis - Kendeng fault) and the Ungaran fault. Moreover, Semarang City is composed of alluvial layers that can accelerate earthquake waves. This study aims to determine site class, peak ground acceleration (PGA) in bedrock, PGA at ground level and earthquake hazard index in Semarang City. In this study, the calculation of peak ground acceleration uses the method in SNI 1726: 2019, while the earthquake hazard index refers to the JICA classification. As input data in the form of the peak ground acceleration value in bedrock, the average shear wave velocity to a depth of 30 meters (Vs30) to determine the site class, as well as the value of the amplification factor. The calculation results in almost all areas of Semarang City have a high earthquake hazard index and only Genuk sub-district has a moderate hazard index. The main determinants of peak ground acceleration at the surface are the source of the earthquake and the rock type

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根据三宝垄最大的地速确定地震危险区

三宝垄市作为中爪哇省的首府，需要一张地震多发地图。这是因为三宝垄有两条活动断层，即三宝垄断裂(巴立比斯—肯登断裂的一部分)和乌加兰断裂。此外，三宝垄市由冲积层组成，可以加速地震波。本研究旨在确定三宝垄市的场地等级、基岩峰值地加速度(PGA)、地面峰值地加速度(PGA)和地震危险性指数。在本研究中，峰值地加速度的计算采用SNI 1726: 2019的方法，地震危险性指数采用JICA分级。作为输入数据的形式为基岩中峰值地加速度值，以30米深的平均横波速度(Vs30)来确定场地的等级，以及放大系数的值。计算结果表明，三宝垄市几乎所有地区的地震危险性指数都较高，只有Genuk街道的地震危险性指数为中等。地表加速度峰值的主要决定因素是震源和岩石类型

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Indonesian Journal of Environment and Disaster

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