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TIME: Almanac 1995
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1995-02-24
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<text id=93TT2512>
<title>
Feb. 15, 1993: When Will It Blow?
</title>
<history>
TIME--The Weekly Newsmagazine--1993
Feb. 15, 1993 The Chemistry of Love
</history>
<article>
<source>Time Magazine</source>
<hdr>
THE WEEK, Page 20
HEALTH & SCIENCE
When Will It Blow?
</hdr>
<body>
<p>Gravity could provide clues to the timing of volcanic eruptions
</p>
<p> Predicting volcanic eruptions is a notoriously inexact
science, and no one knows that better than people along the "ring
of fire" that extends through Southeast Asia. Without warning
last week the Philippines' Mayon volcano blew up, killing at
least 68 and driving thousands from their homes.
</p>
<p> There is hope, though, that forecasts will improve. In
Nature, geophysicist Hazel Rymer and colleagues at England's
Open University reported a possible sign of an impending
eruption: shifts in gravity. They found that the gravitational
field around Italy's Mount Etna increased sharply six months
before it spewed forth in December 1991.
</p>
<p> Rymer cautions that gravity data should be used only with
more conventional forecasting methods. Moreover, the technique
can be dangerous, since researchers often climb into a volcano
to take gravity readings. Last month Rymer's colleague Geoff
Brown died when Colombia's Galeras volcano blew just as he was
setting up his equipment.
</p>
</body>
</article>
</text>