Force & Resilience

Yesterday, I watched NOVA's premiere on PBS with the title "M^T S^T HELENS BACK FROM THE DEAD". The show informs us about insights gained from thirty years of examination of Mount St. Helens and its surroundings, after the volcano blew out its top and one entire side in a massive explosion on May 18, 1980.

The footage of the eruption is breath-taking. The destructive forces unleashed in the catastrophic blast are incomprehensible. Pyroclastic flows wiped out life over 230 square miles. But I was most impressed, following in time-lapse life bounce back in this alien, primordial landscape of utter destruction and desolation. After three months life returned.  A tiny whiskered rodent the size of a hamster, the Northern Pocket Gopher Thomomys talpoides, had survived in its burrows, and even in the most devastated pumice zone, nitrogen-fixating lupines began to flourish. On the surface things seem to progress astonishingly well.

By contrast, underground the outlook is different. Though we have learned much about the forces driving the mountain's eruptions, the interviews with geologists on NOVA make clear that we understand little about the rhythms of seismic activity under the volcano, rendering accurate risk assessment and reliable prediction of a major eruption virtually impossible. I remember watching the last period of noticeable volcanic activity five years ago. I witnessed a dome grow inside the crater and lava glow at night. Ever since, the volcano appears ostensibly quiet.

Despite this respite, the show urgently reminds us of the need to keep a close eye on the mountain. The behavior of burrowing animals with a highly developed sense of touch may provide signatures that may help warn us of a major impending seismic event (see related posts). It may be instructive to observe Northern Pocket gophers. I periodically check the U.S. Forest Service's volcanocam, the least because on some days, weather willing, the mountain looks magnificent and I love to watch the seasons change on her:

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