Initially reported as a magnitude 6.1 event by the USGS at the depth of 51 kilometres (32 mi), it was later revised to 5.9 (Mwb ) or 6.0 (Mww ) at 10 kilometres (6.2 mi) depth.[13][1] The USGS said that it occurred along either a northeast-striking left-lateral fault or northwest-striking right-lateral fault.[1] The GEOSCOPE Observatory reported the earthquake at a magnitude of 6.2 Mw at a depth of 6 km (3.7 mi), [14] and proposed two fault solutions. The first was a south-southwest–north-northeast striking, 70° west–northwest dipping left-lateral fault. A second solution is on a west-northwest–east-southeast trending, near-vertical, right-lateral fault.[14] The European-Mediterranean Seismological Centre (EMSC) reported the magnitude as 5.9 Mw .[15] Meanwhile, the Global Centroid Moment Tensor recorded the event as 6.2 Mw at 15.1 km (9.4 mi) depth.[16] A magnitude 4.5 aftershock occurred 6 km (3.7 mi) south of the mainshock epicenter, one minute later.[17]