Table 4. Kilauea SO2 emission rates - Fixed-wing measurements EAST RIFT ZONE Date SO2 (t/d) SD 05/28/98 2400 520 06/08/98 2020 120 SUMMIT Date SO2 (t/d) SD 05/28/98 none detected xxx 06/08/98 <100 xxx Abreviations: t/d=metric tonne (1000 kg)/day, SD=standard deviation, WS=wind speed, WD=wind direction east of north, N=number of traverses