Letter | Published:

The Turkestan Earthquake of January 3–4

Naturevolume 85page372 (1911) | Download Citation



SOME details of the seismographic and magnetographic records of the great earthquake of January 3 may be of interest to readers of NATURE. The three oscillation phases as seen on the seismogram are comparatively large. They commenced suddenly, each with a westward displacement, at 11h. 37m., 11h. 44.5m., and 11h. 48.5m. p.m. respectively. The large waves (third phase) then continued for 23.5 minutes, producing rapid oscillations of the boom at an average of 35 mm. double amplitude, indicating 14.4″ arc swing of the pillar. But these suffered an early interruption of 5 minutes by an apparent interference of two systems, reducing the amplitude to a minimum at 11h. 54m. p.m. The recovery was immediate and sharp, as if by the arrival of a second train of large waves, resembling closely the effect of the initial shock of the first large waves.

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  1. Stonyhurst College Observatory



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