My experiments with volcanoesJaggar, Thomas Augustus
Science
My experiments with volcanoes
Jaggar, Thomas Augustus
Geologists -- Biography; Volcanoes
This is only a thumbnail sketch of the astonishing luck which met the
photographers and note takers of the Hawaiian Volcano Observatory
in its first decade. There were similar decades in the nineteenth
century, and there were similar jagged crags rising as islands and
shorelines around clover-leaf lakes in 1879 and at other times. There
were undoubtedly earlier similar sympathetic movements whereby Kilauea
had lowered following the end of Mauna Loa outbreaks. But none of this
had ever before been measured from day to day. Our staff from 1912
on occupied the trig stations, every day or night when the weather
permitted, in order to measure within one foot the level of the live
lava up or down. The lava was like the mercury in a barometer and
needed incessant watching. This was done with a telescope, by people
who dwelt on the edge of the vertical pipe. After 1913 the measurements
clearly showed that sinkings were just as important as risings. They
proved that the solid overflow matter and slide-rock slopes around the
edges of lava lakes and coves measurably were a paste. This containing
bank rose and fell at a different rate from that of the gassy liquid
which streamed and fountained inside. The compiled results showed that
the source of the liquid streaming was always at the west side of the
pit bottom and that the streaming was toward fountaining grottos at
the east. The liquid might at any time overflow its banks or sink down
leaving inner cliffs, by failure of full supply up the west wall crack.
All of this may sound highly technical; but notes, photographs,
seismograms, records of weather, and unceasing press releases and
reports to the sponsors, while difficult for literary description,
created a new technique. Science, when one is devising a new approach,
consists of observation first, of experiment second, and of explanation
or theory third. Something of that order has to be followed in the
record of a scientist’s life.
The surprising sympathetic lowering of Kilauea following the end of
Mauna Loa eruptions was only one of numerous surprises during the first
decade of the Observatory. For instance, the temperatures of hot cracks
were repeatedly and systematically measured, and nothing sympathetic
with lava motion was found. The same may be said about the weather.
At the beginning it was supposed that rainfall, air temperature,
barometric pressure, and possibly fluctuation of the trade wind, would
affect the volcano. However, the only quickly evident effect was the
visible vaporing of many cracks on the Kilauea floor which dried up and
diminished when the sunshine appeared, becoming dense and increasing
in cold or wet weather. This obviously meant that the moisture content
of the vaporing cracks, some steam, but mostly moist hot air came from
shallow rain water a short distance underground.
Public-domain text, read in full here on John Shaqi.
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