July 2018 Lombok earthquake

July 2018 Lombok earthquake
Joko Widodo Lombok Earthquake damage.jpg
President Joko Widodo inspected the damage on the worst hit area after an earthquake struck Lombok
July 2018 Lombok earthquake is located in Indonesia
July 2018 Lombok earthquake
UTC time2018-07-28 22:47:37
Local date29 July 2018 (2018-07-29)
Local time06:47:37 WITA
Duration10–20 seconds
Magnitude6.4 Mw
Depth14.0 km (8.7 mi)
Epicenter8°16′26″S 116°29′28″E / 8°16′26″S 116°29′28″E / -8.274; 116.491
FaultFlores Back Arc Thrust Fault[1]
TypeDip-slip (reverse)
Areas affectedWest Nusa Tenggara, Indonesia
Max. intensityVIII (Severe)
Casualties20 dead[3]
401 injured
10,062 displaced[4]
Map of 2018 Lombok earthquakes

A Mw 6.4 earthquake struck the island of Lombok on the morning of 29 July 2018 at a shallow depth of 14 km (8.7 mi).[5] Widespread damage was reported in the area, and authorities confirmed that 20 people were killed in the earthquake while hundreds were injured.[3][6]

The epicentre was located in Sembalun Subdistrict, East Lombok Regency. The earthquake was a foreshock for the more powerful Mw  6.9 earthquake which struck the island a week later.[7]

Tectonic setting

Lombok lies on the destructive plate boundary between the Australian Plate and the Sunda Plate. To the east of Bali the plate boundary starts to involve a collision between the leading edge of the Australian continent and the eastern part of the Sunda Arc and the western end of the Banda Arc.[8] In response to this collision, the arc itself has begun to be pushed over the back-arc Bali Basin along a major thrust fault, the 500 km (310 mi) long Flores Thrust. The Lombok earthquake has been attributed to movement along the Flores Thrust.[1]