Global Volcanism Program | Image GVP-07085
A small explosion February 8, 1999 produced a plume of gas and minor ash that is seen here from the SE about 5 seconds after the explosion began. Rapid lava effusion beginning November 20, 1998 produced a lava dome in the 1994 crater that soon spilled over the crater rim, producing lava flows that descended the SW flank in several lobes. Block-and-ash flows from collapse of the flow fronts traveled down SW flank drainages. Periodic larger explosions occurred later during this eruption.
Photo by Jim Luhr, 1999 (Smithsonian Institution).