Dykes blocked the tributaries of the Brahmaputra; that in the Dibang valley broke without causing damage, but that at Subansiri opened after an interval of 8 days and the wave, 7 metres high, submerged several villages and killed 532 people.
Radiocarbon dating identified the deposits at roughly 500 years old, which would correspond with a recorded earthquake in 1548.
This shock was more damaging in Assam, in terms of property loss, than the earthquake of 1897.
The extraordinary sounds heard by Kingdon-Ward and many others at the times of the main earthquake have been specially investigated.
Seiches were observed as far away as Norway and England. 63-64.) This great earthquake, destructive in Assam and Tibet, has a calculated magnitude of 8.6 and Strasbourg regards it as the most important since the introduction of seismological observing stations.
The only available on-the-spot account is that of F.
Kingdon-Ward, a botanical explorer who was at Rima.However, he had little opportunity for observations; he confirms violent shaking at Rima, extensive slides, and the rise of the streams, but his attention was perforce directed to the difficulties of getting out and back to India.A new account of the earthquake is now available in "Once I Was Young" a book by Helen Myers Morse (Terre-Haute, Indiana, 2003, page 167-171), She was living near Putao (North Myanmar) at the time and wrote letters home.occurred on 15 August and had a moment magnitude of 8.6. The earthquake was destructive in both Assam and Tibet, and between 1,500 and 3,300 people were killed.It was the sixth largest earthquake of the 20th century.Bustling and hectic at times, the city is the heart of commerce in the region and accordingly has all the modern amenities which are almost at par with other cities of the world.