Abstract
This paper presents one dimensional non-linear site response analysis of liquefaction potential caused by the 2000 and the 2007 earthquakes in coastal area of Bengkulu City, Bengkulu, Indonesia. Site investigations, including Standard Penetration Test (SPT) and shear wave velocity (VS) measurement, were conducted in three locations along the coastal area of Bengkulu City. Further, the site investigation data were used in simulation of one-dimensional non-linear site response analysis by applying the synthetic ground motions at bedrock. The results show that liquefaction could happen at 0 to 1.5 m deep. This was indicated by the excess pore water pressure ratio (ru) which exceeded one. At depth between 1.5 m and 20 m, the excess pore water pressure almost reached the initial effective stress decreasing the effective confinement pressure close to zero. The results also indicated that liquefaction is possible to occur in this depth range if a stronger earthquake occurs.
Highlights
During the last decade, two strong earthquakes occurred in Bengkulu City, Indonesia, i.e. the 8 Mw Earthquake in 2000 and the 8.7 Mw Earthquake in 2007
Both earthquakes resulted in the devastating impact to many buildings and resulted in some liquefaction, which were found along coastal area of Bengkulu City
The result of the study was interpreted by Misliniyati et al [3] in a vulnerable map of liquefaction corresponding to the impacted depth
Summary
Two strong earthquakes occurred in Bengkulu City, Indonesia, i.e. the 8 Mw Earthquake in 2000 and the 8.7 Mw Earthquake in 2007 Both earthquakes resulted in the devastating impact to many buildings and resulted in some liquefaction, which were found along coastal area of Bengkulu City. Several liquefaction studies using empirical analysis in coastal area of Bengkulu City had been conducted. Muktadir [1] studied liquefaction potential in Lempuing, a part of coastal area of Bengkulu City. Monalisa [4] analysed the liquefaction potential in the same area using the simple probability concept. Mase and Sari [5] extended the study of Monalisa [4] to compose the liquefaction resistance curve based on peak ground acceleration and grain size distribution. In 2016, Mase and Somantri [6,7] studied the other important coastal areas in Bengkulu City, i.e. Pantai Panjang and Anggut, which are known as the tourists destinations in Bengkulu City
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