Indonesian archipelago is located in the convergence zone of four major tectonic plates:
Eurasian plate, Indian-Australian plate, Pacific plate and Philippine plate. Interaction of these plates affected the seism-tectonic of the Indonesian region.
The Indian-Australian plate moving northwards relative to Eurasian plate and the Pacific plate moving westward relative to both Indian-Australian and Eurasian plate.
Moreover, as a result of the India and Australia plates converging with and sub ducting beneath the Sunda plate at a rate of approximately 50 to 70 mm/yr.
Major tectonic setting in this area is subduction zone in western part of Sumatera and Sumatera fault system along the sumatera island. Focal mechanism shows this earthquake major mechanism was strike slip.
2015-11-7 at 22:03:32 UTC or 05:03:23 local time an Earthquake with M 6.5 occurred. Epicenter at 96.1080 E 5.2810 N and 8.6 Km depth. Combination of medium magnitude and shallow depth results building damages as consequences.
USGS focal mechanism give us information that dominant movement mechanism was strike slip, which is not the dominant mechanism of subduction margin, but location far away from the major Sumatera Fault System. Most Possible it is related to Semalanga-Sipopok, the closest known strike slip fault in vicinity area of epicenter. The depth and location of hypocenter also support this argument.
Shakemap of our model estimated maximum intensity is VII-VIII MMI. Preliminary report of media also show some damages level of building those confirm our calculation about maximal intensity.
Our model estimated IDR 100-500 billion of possible economic loss. Based on national earthquake database in MAIPARK we also estimated most possible insurance loss from building damage could be around IDR 0-20 billion.