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Updated: May 25, 2025
It has been said and written that there are no steam-cracks or similar traces of volcanic action on Mauna Kea, but in several fissures I noticed ferns growing belonging to an altitude 4000 feet lower, and on putting my arm down, found a heat which compelled me to withdraw it, and as the sun rose these cracks steamed in all directions.
Signs of volcanic activity are present more or less throughout its whole depth and for some distance along its margin, in the form of steam-cracks, jets of sulphurous vapor, blowing cones, accumulating deposits of acicular crystals of sulphur, etc., and the pit itself is constantly rent and shaken by earthquakes.
They are all composed of cinders of light specific gravity, and much of the ash is tinged with the hydrated oxide of iron. Very few of the usual volcanic products are present. Small quantities of sulphur, in a very impure form, exist here and there, but there are no sulphur or steam-cracks, or hot springs on any part of the mountain.
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