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PRECURSOR EVENTS
In 1980, the University of Washington had just completed the establishment of a system of seismometers to help monitor the Cascade volcanoes. The computer feeds for the station went into operation on March 1. The first indications of a major problem came on March 20, when a 4.2 magnitude earthquake was recorded beneath Mt. St. Helens. Three days later another 4.0 M was recorded, and that evening the earthquakes began occurring in swarms centered directly beneath the volcano, at a rate of about 15 per hour. By March 25, magnitude 4 events were shaking Mt. St. Helens at a rate of about 3 per hour. On the same day, several overflights revealed new fractures on the glacier surfaces and a number of avalanches and rockfalls.
In early afternoon on March 27, a loud explosion was heard from the direction of Mt. St. Helens. Although the volcano was shrouded in clouds, a summit eruption was verified by a news team from the Vancouver Columbian. As they circled the summit in an airplane, they spotted a dense column of ash rising through the clouds to a height of about 2000 m. As the weather cleared later in the day, a new crater was visible, with a diameter of about 70 m, and snow on the summit area was covered by a thin veneer of dark ash. The summit eruption on March 27 was typical of several small eruptions that would occur through April and early May. None of these eruptions were magmatic in character, but instead they were steam eruptions generated by the heating of groundwater above a rising plug of magma that had invaded the central conduit of the volcano.
At 12:36 p.m. on March 27, at least one but possibly two nearly simultaneous phreatic eruptions (exploding groundwater-derived steam) ejected and smashed rock from within the old summit crater, excavating a new crater 250 feet (76 m) wide[5] and sending an ash column about 7,000 feet (2,100 m) into the air.[7] By this date, a 16,000-foot (4,900 m) long, east-trending fracture system had also developed across the summit area.[8] This was followed by more earthquake storms and a series of steam explosions that sent ash 10,000 to 11,000 feet (3,000 to 3,400 m) above their vent.[5] Most of this ash fell within 3 to 12 miles (5 to 20 km) from its vent, but some was carried as far as 150 miles (240 km) south to Bend, Oregon, and 285 miles (460 km) east to Spokane, Washington.[9]
A second, new crater and a blue flame was observed on March 29.[10][9] The flame was visibly emitted from both craters and was probably created by burning gases. Static electricity generated from ash clouds rolling down the mountain sent out lightning bolts that were up to two miles (3 km) long.[9] Ninety-three separate outbursts were reported on March 30,[9] and increasingly strong harmonic tremors were first detected on April 1, alarming geologists and prompting Governor Dixy Lee Ray to declare a state of emergency on April 3
Originally posted by trusername
because the last harmonics set off a volcano icon on RSOE so it's probably not wind
Originally posted by ressiv
YPP went harmonic too.
Originally posted by Indy
Originally posted by trusername
because the last harmonics set off a volcano icon on RSOE so it's probably not wind
Can you explain what RSOE is? And what particular location are you speaking of?
Originally posted by ressiv
YPP went harmonic too.
Can you provide a source? If you guys are seeing the harmonic signature in the seismographs could you please be so kind as to post the images and mark the area of concern for the rest of us? If the harmonic signature is present that is indeed a very significant thing.
Thanks in advance.