Nearly 700 trekkers headed down Mount Rinjani on Indonesia's tourist island of Lombok on Monday, a day after a powerful earthquake of magnitude 6.4 terrified the climbers as boulders tumbled down the slopes of the volcano. unday's earthquake, which was centred on the northern part of Lombok, but was also felt on the resort island of Bali to the west, stood at 16. More than 335 people were injured, many by collapsing buildings.