<P> On March 15 , 1991 , a succession of earthquakes was felt by villagers on the northwestern side of the volcano . Further earthquakes of increasing intensity were felt over the next two weeks , and it became clear some kind of volcanic activity was likely . On April 2 , the volcano awoke , with phreatic eruptions occurring near the summit along a 1.5 km ( 0.93 mi ) long fissure . Over the next few weeks , small eruptions continued , dusting the surrounding areas with volcanic ash . Seismographs recorded hundreds of small earthquakes every day . </P>
<P> On March 15 , 1991 , a succession of earthquakes was felt by villagers on the northwestern side of the volcano . Further earthquakes of increasing intensity were felt over the next two weeks , and it became clear some kind of volcanic activity was likely . On April 2 , the volcano awoke , with phreatic eruptions occurring near the summit along a 1.5 km ( 0.93 mi ) long fissure . Over the next few weeks , small eruptions continued , dusting the surrounding areas with volcanic ash . Seismographs recorded hundreds of small earthquakes every day . </P>
what was the first sign that mt . pinatubo had awoken
what was the first sign that mt . pinatubo had awoken
March 15 , 1991
March 15 , 1991