Richard Dixon Oldham's classic memoir on the great Mw = 8.1 Assam earthquake of 1897 is seminal for its seismological observations, insights, and conclusions (Oldham 1899). Teleseismic arrivals of waves from Shillong led Oldham (1858–1936) to distinguish the three types of seismic waves and eventually to recognize from them the distinctive presence of the Earth's core. Oldham, however, did not feel the earthquake. He had left the Calcutta office of the Geological Survey of India (GSI) in the care of his colleague Thomas Henry Digges La Touche (1856–1938) two weeks previously (see figure 1). Now recently...

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