My experiments with volcanoesJaggar, Thomas Augustus
Science
My experiments with volcanoes
Jaggar, Thomas Augustus
Geologists -- Biography; Volcanoes
I was interested in the relics of liquid basalt collected on the lip
of the great rift through Tarawera Mountain. The rupture extends the
length of Rotomahana Lake, which sank away as a groundwater phenomenon
in 1886. This, like Bandaisan, was one of the great steamblast
eruptions of history. It was right on the line of volcano spacing
extending from White Island in the Bay of Plenty, to Ngauruhoe and
Ruapehu Volcanoes, beyond Lake Taupo at the south. Here was a land
of echelons of deep cracks, building up along scores of miles from
submarine eruptions such as Falcon Island in the Tonga group. Farther
south is the dangerous looking White Island close to the New Zealand
shoreline, resembling Bogoslof, and so on to the lava volcanoes at the
south. Big earthquakes have been characteristic, along with uplift, of
both shorelines of Cook Strait.
This kind of gradation is certainly like the transitions from
submarine eruption to continental uplift, crowned with volcanoes, so
characteristic of Japan, the Aleutians, California, and Italy. It is
impossible to think of it, when we consider water depths of 4,000
fathoms, and a step upward to such altitudes as the New Zealand alps,
all linear for a distance of several hundred miles, except in terms of
the faulted deep earth crust. And seismologists tell us that that crust
is 1,800 miles deep.
The associations made on this trip were destined to have far-reaching
effect in meetings with New Zealand scientists at later dates. I
met Professor Bartrum of Auckland; the officials of the New Zealand
Geological Survey; Dr. Ernest Marsden, distinguished physicist who
had worked with Rutherford in England; and Dr. C. A. Cotton, physical
geographer and author. Cotton showed us the elevated shorelines
of Wellington associated with the big earthquakes of 1851. Other
personages were Professor Speight, geologist of Christchurch College,
and in Dunedin, Professor R. L. Jack, physicist of Otago University
and our host. Dr. C. E. Adams, government astronomer of Wellington,
we were to meet again on Tin Can Island in 1930, during the United
States Eclipse Expedition. Dr. J. MacMillan-Brown, chancellor of
the University of New Zealand, and his daughter entertained us in
Christchurch; and he later visited us several times in Hawaii in the
course of his extensive travels.
I was glad to stimulate volcanology in New Zealand and pleased when
there eventually appeared the splendid work of Dr. L. I. Grange, on
the “Rotorua District,” with a project for geophysical surveys made
imperative by the Napier earthquake disaster.
Public-domain text, read in full here on John Shaqi.
Reviews
Reviews
No reviews yet
Be the first to share your thoughts on this work.
Elsewhere in the archive
Join the Discussion
Join the discussion
Sign in to leave a comment or review.
Sign InorCreate an account