BUKITTINGGI, NNC - A 4.0 magnitude earthquake occurred approximately 8 kilometers northwest of Bukittinggi, West Sumatra, at 7:22 a.m. on Tuesday, due to the activity of Semangka Fault which is part of the Sumatran Fault.
The Meteorology, Climatology and Geophysics Agency (BMKG) Geophysical Padang Panjang Station announced that the quake ccurred at coordinates 0.23 South Latitude and 100.37 East Longitude with a hypocenter depth of 7 kilometers.
Head of Geophysics Station Fajar Dwi Prasetyo said that based on the position of the earthquake recorded, it was caused by an activity in the Sumatera Fault in Segian Sianok.
The Sianok segment has a 23mm/year displacement speed with a strike-slip type.
The position of Sianok Segment extends from the east of Lake Singkarak through the southwest of Mt. Marapi, West Sumatra, to Sianok Gorge at a length of 90 kilometers.
The last major earthquake occurring in the segment was recorded twice on March 6 2007 measuring 6.4 and 6.3 on the Richter Scale.
According to Antara on Tuesday, July 17, based on reports received by BMKG, the quake occurring Tuesday morning could be felt in Bukittinggi region in IV MMI, Padang Panjang III MMI, and some areas in Agam District including Ampek Angkek and Lawang.