Contents

28 February 1997
Vol 275, Issue 5304

About The Cover

One of the hundreds of explosive eruptions that occur annually at Sakurajima Volcano, Japan. These discrete explosive events are accompanied by shock waves and lightning. Eruption pressures of 0.2 to 5 megapascals (50 times atmospheric pressure) are estimated from shocks recorded on microbarographs. See 1290 and the Perspective on 1278. [Photograph: Kazuhiro Ishihara, taken from the Sakurajima Volcano Research Center, 5.5 kilometers west of the summit at 23:03 Japanese standard time on 18 May 1991]