Meteorites are a valuable and extremely cheap source of extra-terrestrial material. Unfortunately, on probabilistic grounds we must presume that the bulk land in the oceans, and that even those that do land on dry land must go undetected. In this paper, I look at the possibility of using seismometers as an all-weather, day/night meteorite impact detection system. I show that it is relatively easy to distinguish such impacts from normal seismic events, and by using data taken from reports of the impact of the Lockerbie aircraft in December 1988, I estimate the sensitivity of current seismometers to meteorite impacts.