Ground　vibration　induced　by　subsurface　detonations　in　geological　media　such　as　soil,　termed　as　ground　shock,　has　long　been　measured　for　decades,　since　the　free　field　time　history　and　peak　intensity　of　the　shock　is　the　incident　load　to　underground　structures　and　important　for　design.　To　address　the　affected　measurement　accuracy　due　to　acoustic　impedance　mismatch,　a　simple　but　effective　approach　is　proposed:　A　sensor　is　embedded　into　a　cellular　solid　casing　before　being　installed　in　soil,　whose　acoustic　impedance　is　designed　to　be　the　same　as　that　of　the　surrounding　soil　to　eliminate　the　reflection　between　the　soil-casing　interface　while　the　relative　motion　between　the　sensor　and　casing　is　minimized.　A　field　test　and　theoretical　analysis　are　conducted　to　investigate　the　proposed　approach,　and　it　is　found　that　the　accuracy　of　ground　shock　measurement　is　improved.