Abstract
On the 4th of June, 2000 and 12th of September, 2007, Ratu Agung Sub-district, Indonesia experienced significant damage due to liquefaction after the earthquakes. Therefore, this study aims to determine the Liquefaction Potential Index in the area. Data of shear wave velocity (Vs) was collected using the Multichannel Analysis of Surface Wave (MASW) method. The measurement location was set up on a grid of 32 observations points with field investigations. Furthermore, Simplified Procedure and LPI methods were used to measure the soil liquefaction potential and vulnerability level. The results showed that the value of shear wave velocity in the Ratu Agung Subdistrict ranged from 102 m/s to 442 m/s. Also, the liquefaction vulnerability levels varied from high to very high categories due to the maximum soil acceleration and conditions dominated by loose sand, as well as the influence of different geological formations in the zone. In conclusion, an empirical equation was successfully proposed to analyze the liquefaction vulnerability.
Highlights
Bengkulu City is vulnerable to earthquakes that trigger liquefaction [1], due to the Indo-Australian and the Eurasian Plates subduction zone
The liquefaction potential index (LPI) values that are estimated from obtained 32 observation points spread across Ratu Agung Sub-district are observed to vary from 5.36 to 29.89
The results showed that all test points in the Ratu Agung Sub-district had a high liquefaction potential
Summary
Bengkulu City is vulnerable to earthquakes that trigger liquefaction [1], due to the Indo-Australian and the Eurasian Plates subduction zone. The trigger factor of liquefaction in Bengkulu City is the earthquake event that occurred on June 4, 2000, and September 12, 2007, with magnitudes of Mw 8.0 and Mw 8.6, respectively. Those earthquakes are later known as Bengkulu-Enggano Earthquake and Bengkulu-Mentawai Earthquake, respectively. Several previous studies showed that the coastal zone of Bengkulu City including Ratu Agung Sub-district is vulnerable to undergo liquefaction as well [6]
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