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 page 1290 and the Perspective on page 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]

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