Abstract
The strain release curve of the aftershock sequence of the great Assam earthquake of August 15, 1950 exhibits three linear segments. A secondary aftershock sequence has also been reported; the strain release curve in this case is also linear. The b value, using the maximum likelihood method of Utsu, for the sequence is 0.52 ± 0.095. The fault plane solution shows that the fault strikes almost cast-west and dips northward at an angle of 80°; the motion is predominently strike slip (right lateral type). The spatial distribution of aftershocks shows two main centers of activity at the two ends of the probable fault.
Highlights
On August 15, 1950 at 14:09.5 GMT an earthquake of Richter magnitude 8.7 [21] having the epicenter at 28.6°ii, 96.5°E occurred in upper Assam
The focal depth of this shock was estimated to be about 15 km. Effects of this earthquake in Assam are given in detail in a publication of the Central Board of Geophysics [20]
When this earthquake occurred one of the authors was in Myitkyina in a town of northern Burma
Summary
On August 15, 1950 at 14:09.5 GMT an earthquake of Richter magnitude 8.7 [21] having the epicenter at 28.6°ii, 96.5°E occurred in upper Assam. This is because the B values for the first segment is very low, as a result of which tlie ratio in the present case appears to be 1:5:15 This is because the first listed aftershock in the sequence occurred at t = 0.111 days, i.e., 2h39m50s after the main shock. The frequency of occurrence was quite high, but after ten hours the frequency started falling and the number of shocks per hour reduced to 4 by August at hours In this case the general trend of decay followed the same inverse power law as given in Eq [1], Frequency-Magnitude can be expressed by the relationship [14]. Where N is the number of earthquakes with magnitudes between M and M + &M, and a and b are constants
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