The Recent Earthquakes in Asia

Abstract

As it is unusual for the Kew magnetographs to be affected by earthquakes, it seems worth mentioning that on the occasion of the Turkestan earthquake, near midnight (G.M.T.) of January 3, both the declination and horizontal force traces show unmistakable effects. The magnets oscillated in a way characteristic of mechanical shocks. According to our Milne seismograph, the preliminary seismic tremors reached Kew about 11.35 p.m., and the large waves about 11.47 p.m., when the limits of registration were exceeded for a minute or so. There was then a comparative lull until about 11.54, when the limits of registration were again exceeded, and these very large movements continued with short interludes for more than fifteen minutes.