On July 10, 2016, an MLv 3.7 earthquake had been occurred in Purworejo region, Central Java, Indonesia. BMKG reported that the earthquake has an aftershock just 5 hours after the MLv 3.7. The following event occurred in 23:17 UTC that only recorded in local seismic stations. It is interested that a small earthquake has an aftershock. For further analysis, we need to know about the seismotectoni…