TheFlores back-arc thrust fault is a major system of west–east trendingthrust faults that extend eastwards from west ofLombok just south of whereSunda Shelf ends atBali Sea, towards the islands ofSumbawa,Flores, andAlor, with a total length of at least 800 km.,[1] entering theWeber Basin andAru Basin adjacentSahul Shelf of theAustralian plate. The thrust faults are south-dipping and lie within theback arc region of theSunda–Banda Arc, which is related to the ongoingsubduction of theAustralian plate beneath theSunda andBanda Sea plates. The thrust fault system developed as a result of the onset ofcontinental collision ascontinental crust of the Australian plate reached theSunda Trench. The eastern part of the fault system is also known as the Wetar thrust. Above the main thrust fault are a series of imbricate (overlapping) thrust faults. These imbricate thrust faults are shallower in depth than the main Flores thrust.[2] Although the exact thrust faults have not been established, these faults were thought to be responsible for the2018 Lombok earthquakes.
