The influence of earthquake force directions on building construction in Lombok Island: a case study of Pandanduri dam in East Lombok

Abstract

Lombok Island is one of the regions in Indonesia that has a relatively high risk of earthquakes due to being flanked by two earthquake sources, namely from the south in the form of Indo-Australian plate thrusting (subduction mega-thrust) and north there is a north arc pressure (Flores thrust). Pandanduri Dam is located in the direction of the earthquake force N 171° E. This study aims to determine changes in dam planning using earthquake force calculations from SNI 1726-2002 to SNI 1726-2012 and the effect of the direction of earthquake strength on dam stability. The analysis results show that earthquake risk in Lombok Island is 0.34 g and 0.42 g for the possibility of exceeding 10% and 2% in 50 years. SNI changes in earthquake force calculations have decreased by 26% for 500 years and an increase of 10% for 2500 years. The percentage of the earthquake force directions is not known to be greater than the percentage the earthquake force directions known that N 171°E is influenced by the angle produced by the earthquake direction N 171° E which is 0.094° for the main force direction of the dam and 89,906° for the direction perpendicular to the dam.