Abstract
Jakarta is the capital city of Indonesia with a very high population density low to the upper distribution of buildings which causes many areas of Jakarta to have a high vulnerability to natural disasters, one of which is an earthquake. One of the earthquakes felt this year was Lebak Banten Earthquake January 23, 2018, with a magnitude 6.1 at 13.34 local time. The depth of the earthquake was 61 Km at -7.09o S - 106.03o E, in the South Indian Ocean of Java Island. The epicenter was 43 km from Cilangkahan Village, Malingping Sub-district, Lebak District, Banten. We analyze the ground motion characteristics in the Jakarta area using 3 component acceleration data at Jakarta City Hall Office (JAKO) and Tanjung Priok Maritime Station (JATA) with dynamic statistical analysis method. The effective duration and earthquake response spectrum are determined using the acceleration data. In this study, the active period of the earthquake was calculated using the Trifunac and Brady method. The results of the analysis show that the most significant acceleration spectrum at JAKO station is found in component E of 0.07742 g in the period of 0.54 s while for the most significant acceleration spectrum JATA station found in component N of 0.04572 g in the period of 0.58 s. The effective duration obtained at JAKO stations was 56.76 s and JATA station 63.47 s. These results indicate that in the case of the Lebak earthquake, the further region from the epicenter of the earthquake has an effective duration which is relatively longer.
Highlights
The population density is one of the factors that causes the vulnerability level of a region to a natural disaster will be higher because it is feared that a large number of fatalities and significant material losses
The results showed that the acceleration spectrum of the Lebak earthquake January 23th, 2018 at Jakarta City Hall Office (JAKO) station had the highest value in component E with a value about 0.07742 g in the period 0.54 seconds
If the value is compared with the value of acceleration spectrum response design calculated based on the provisions of SNI-1726: 2012, the value of acceleration spectrum of Lebak earthquake at JAKO and JATA stations are still far below the spectrum response design for both locations, both for hard soil types (SC), medium soil (SD), or soft soil (SE)
Summary
The population density is one of the factors that causes the vulnerability level of a region to a natural disaster will be higher because it is feared that a large number of fatalities and significant material losses. Jakarta as the largest city, which has an area of approximately 661.52 km (with sea area: 6,977.5 km2), with a population of 9,607,787 inhabitants [1]. As a capital, it is reasonable if Jakarta has a high population density compared to other regions in Indonesia as well as the buildings. It caused Jakarta to be vulnerable to natural disasters, one of which was an earthquake. It causes we need disaster mitigation that is good at, after or before the occurrence of natural disasters
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