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Graphics Interchange Format  |  2000-05-25  |  11.5 KB  |  658x376  |  1-bit (2 colors)
   ocr: Cataclysmic eruption. Mount St. Helen's first magmatic eruption Cause: erupton of of 1980, on sunday, May 18, was sudden, violent, and dlsastrous. d volcano, At 8:32 A.M., an earthquake of about magnitude 5 jolted the volcano. The earthquake caused a large part of the upper northy flank of the volcano to break loose along a steep fracture and begin to slide downslope rapidly. The massive rocksllde exposed a steep new rock face. Water from within the volcano flashed to steam--removal of the rockslide slab from the flank had depressurized or "uncorked" the underlving hiqh-pressure system of ma g ...