M 6.2 TOLOTANGGA EARTHQUAKE ON FRIDAY, DECEMBER 30, 2016
Australia plate move to the North and subducted beneath Sunda plate. Rate of this motion around 64-73 mm/year. Earthquakes profile beneath Sumbawa shows subduction indication clearly. Subduction in this area is part of the Sunda Arc subduction margin.
at 2016-12-29 22:30:18 UTC or 2016-12-30 05:30:18 WIB, an M 6.2 Earthquake occurred behind Java Ridge. Epicenter at 118.6090 E - 9.0670 S and 72.3 Km depth.
Big blue point in the figure above shows the epicenter location. Slice projection is showed by blue line across the epicenter. Figure bellow is cross section of historical earthquake along the blue line. It shows the subduction zone clearly.
Combination of Magnitude and the depth of this event didn’t produce enough vertical deformation at surface, so there was no tsunami generated. However, due to depth and Magnitude, it might be felt in wide area but with no damage at all, it is a signature of medium depth earthquake with medium magnitude.
MAIPARK cat model estimated maximum intensity in affected area could reach VI MMI scale and no or very minor losses only. Preliminary report of BNPB also did not show any substantial damage around the nearest area.