My experiments with volcanoesJaggar, Thomas Augustus
Science
My experiments with volcanoes
Jaggar, Thomas Augustus
Geologists -- Biography; Volcanoes
Pettersson had a skilled staff consisting of biologist, physicist,
chemist, and geologist; and they had laboratories on board the
_Albatross_ for study of the collected bottom materials. They
also took echo data of explosions near sea bottom, giving depths of
soft materials over hard rock. This place of transition was found to
be shallower under the Pacific Ocean than under the Atlantic. They
discovered hard lava flows in many places between Tahiti and Hawaii
and under the Indian Ocean, indicating extensive submarine volcanic
eruption. An attempt was made to measure the temperature of a core,
and this suggested that the bottom of the boring was warmer than the
top, meaning a thermal gradient of sea bottom. A core of volcanic
agglomerate was obtained in the deep trench opposite the East Indies.
It was during this period that President Gregg Sinclair of the
University of Hawaii urged a plan for geophysics of the Pacific, and
Professor R. W. Hiatt of that institution succeeded in advancing
interest in organic oceanography. I wrote an appeal, based on such work
as that of Pettersson, Perret, and others urging the Regents of the
University to plan a large geophysical institute in Hawaii, to make a
science of the rock bottom of the Pacific Ocean.
Thousands of soundings made in the Gulf of Alaska and in the central
Pacific had shown seamounts, or guyots, shaped like high volcanoes on
the sea floor, some of them with flat tops, but having characteristics
of ancient isolated volcanoes. New soundings revealed mountain
ranges on the sea floor, probably volcanic, one of them right across
the middle of the Hawaiian chain. No one had yet discovered fiery
eruption in deep water, but oceanographers were beginning to use
boring machines, cameras, electric lights, and devices for determining
radioactivity of the muds. As sea bottom occupies three-quarters of the
globe, it is inconceivable, when compared with the continents, that
it has no hot solfataras, hot springs, and hot volcanoes. In fact,
we know some of the latter in shallow water. It is only a question
of scientific organization to locate the sources of Pettersson’s
submarine lava flows. President Sinclair took to the chiefs of the
Rockefeller and Carnegie Foundations a proposal for a five million
dollar Geophysical Institute at the University of Hawaii, to utilize
the advantages of its central Pacific position.
Public-domain text, read in full here on John Shaqi.
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