Characterization of Lombok Earthquakes on July-August 2018 using Focal Mechanism Analysis

Focal mechanism study was carried out on 5 major earthquakes that occurred in Lombok on July-August 2018. The KIWI program was applied here to compare the parameters of the 5 earthquake sources. The principle of the KIWI program is inversion of wave components at various stations to obtain the moment tensor. Green's Function is also implemented to create synthetic waves representing the observation waves. Source parameters are taken from the synthetic waves from the five recorded events, and it was found that the 5 earthquakes on July 29^th, 2018, August 5^th, 2018, August 9^th, 2018, and two earthquakes on August 19^th, 2018 have strike values varying between 61°-74°, dip values between 18°-36°, and rake values between 75°-93°. These five earthquakes have similar source parameters, and have focal balls which state that the type of fault in these earthquakes are thrust faults. The similar source parameters, close range of time of occurrence, and hypocenter distances indicate that the earthquake events were most likely caused by the same fault.