DO EARTHQUAKES HAVE ELECTRICAL PRECURSORS? The elastic waves measured by seismometers are transmitted by the flexing crust while an earthquake is doing its worst. But some scientists believe that flexing also goes on in the hours and even weeks before a quake. Too small to be detected seismically, the flexing might well be sensed electrically. As underground strata rearrange themselves before a quake, the thinking goes, pockets of water are squeezed into new configurations, changing local conduction properties, which can be monitored with buried electrodes. On this basis Panayiotis Varotsos at the University of Athens (011-30-1-894-9849, pvaro@leon.nrcps.ariadne-t.gr), has reportedly predicted certain quakes in Greece weeks ahead of time by triangulating voltage differentials at the level of 10 millivolts/km over distances of 100 km. (Some skeptics dispute this assertion.) In new research, Varotsos buttresses his claims with laboratory studies of another system under pressure which puts out transient electrical signals before it fractures, namely a crystal containing a variety of dislocations and defects. Conductivity patterns in the crystal convince Varotsos that analogous patterns (although on a much bigger distance scale) observed in the buried electrode arrays constitute a true earthquake precursor. (Varotsos et al., Journal of Applied Physics, 1 Jan, 1998; journalists can obtain the paper from physnews@aip.org.)