Abstract

Abstract Fault activities was detected during periods of 2016 to 2018 which presented by land subsidence in East Lombok and Central Lombok regencies during this period. In order to find out the impact of the earthquake which occurred from July to August 2018, time lapse microgravity anomaly before and after earthquake was compared, i.e. time lapse microgravity anomaly 2016 to 2018 period and 2018 to 2019 period. Measurements were carried out at about 80 points which distributed in both of regencies. Time lapse microgravity anomalies periods of 2016 and 2018 show positive values at all measurement points and deformation analysis revealed that subsidence occurred at all study areas. The results of the time lapse microgravity anomaly data processing between the periods of 2018 to 2019 show the opposite one. The results of data analysis and processing of time lapse microgravity anomaly during period 2016 to 2019 shows the deformation process on the surface before the earthquake Lombok and it was stopped due to the events of the Lombok Earthquake in 2018. The earthquake that generated by the thrust fault mechanism causing elevation change of the research area in Central Lombok Regency and East Lombok, an event of uplifting occurred.

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