Surface motion was measured above a detonation of liquid explosive in a hydraulic fracture in oil shale and at three stations located at 38, 89, and 193 times the charge burial depth away from the epicenter. No damaging surface motion was expected from a charge of the size detonated, but measurements were made to provide a foundation for the surface motion predictions in the event commercial application of in situ retorting led to detonation of charges of larger size. Measurements recorded were of high quality in spite of the low amplitude. Residual displacement at surface zero as determined from the transient measurement agreed especially well with postshot survey. The measurements produced data which can be used for first-order predictions of surface motion on future detonations of a similar type.