Given the massive scale of the disaster, SHEEP Indonesia Foundation (YSI) decided to conduct an assessment to determine the priority scale of the disaster impact response. The YSI team conducted a field assessment on 2-6 August 2018, together with the Team from GPIB Imanuel Church as the first contact who respond to initial data requests from YSI.
In contrast to the seismic cycle that occurs in Indonesia in general, which is known as the "ring of fire", where the main earthquake will be followed by aftershocks that are smaller in scale (tremor); The earthquake in Lombok with magnitude 6.4 SR on July 29 was followed by aftershocks on July 5, 2018 at 19:47 hours with a scale of 7 SR with potential Tsunami. When the second major earthquake occurred, YSI's assessment team was located in Masbagik-East Lombok Village (about 10 miles) from Sembalun-East Lombok, which was the worst affected in the previous earthquake. The entire area of East Lombok Regency after the 7 SR earthquake experienced power outages, as well as parts of West Lombok and Mataram City. The YSI team only returned to be able to communicate after arriving in the city of Mataram at 23:30 hours.
Based on the results of the YSI Team's assessment sourced from primary in field and secondary data from various parties, YSI summarized it as follows: