USGS: 3rd earthquake this week reported in Kansas February 16, 2017 by Post Staff Leave a Comment Location of Thursday’s quake-USGS image HARPER COUNTY — An earthquake shook South Central Kansas just 7:40a.m. on Thursday. The quake measured a magnitude 2.7, according to the U.S. Geological Survey and was centered approximately 16 miles east of Anthony. On Monday a 3.3 quake hit just north of the Oklahoma State line in Sumner County. On Sunday, a 3.1 magnitude quake shook 16 miles northwest of Harper. There were no reports of damage or injuries on Thursday, according to the Harper County Sheriff’s Department.