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Scientists call swarms of quakes evidence volcano is still activeIn less than a week, four swarms of more than 120 earthquakes shook Mount St. Helens in late November. Although they were too small to be felt even by someone standing directly over their epicenters, scientists say they reveal
the volcano is likely recharging."Each of these little earthquakes is a clue and a reminder we are marching toward an eruption someday," said Weston Thelen, a U.S. Geological Survey seismologist with the Cascades Volcano Observatory in Vancouver.
However, "there's nothing in this little modest seismicity, and none since 2008, that is a really good indicator of when that eruption will be."
The earthquakes occurred between 1 and 2 miles below the surface and most registered at magnitudes of 0.3 or less; the largest was a magnitude 0.5. While the quakes are too small for human perception, scientists are able to study them thanks to sensitive seismometers stationed around the mountain.
As magma comes into the volcano's system and is stored, scientists think that it releases gases and fluids that travel up into cracks, pressurizing and lubricating them, and causing small quakes.
Comment: It is likely that atmospheric dust loading from increased comet and volcanic activity is contributing to the 'strange skies' we are witnessing, the cooling effect of which causes ice crystals to form. See also:
- Beautiful iridescent clouds appear over Santiago, Chile
- 'Rare' noctilucent clouds put on sunrise show over Whitley Bay, UK
- Rare atmospheric 'crown flash' phenomenon seen above Moscow, Russia
- What causes iridescent clouds?
- Rare undulatus asperatus clouds form over Dorset, UK
- Spectacular multi-colored 'light pillars' illuminate skies in northern China
- Ball-lightning? 'Strange light' seen over Canberra, Australia
- Weird glowing light spotted over Netherlands: plasma discharge event?
Electric universe theory provides rational, intelligible explanations for such atmospheric phenomena as ball lightning, plasma discharges, noctilucent clouds, lightning, hurricanes and tornadoes. For more information on this and much more read, Earth Changes and the Human-Cosmic Connection by Pierre Lescaudron and Laura Knight-Jadczyk.