In 1888 R. D. Oldham, the seismologist best known for first quantifying the diameter of the Earth’s core using seismic waves, provided a description of the surface rupture of an active fault at the southeast end of the Kashmir Valley. Intriguingly, he described it as a normal fault parallel to the strike of the trend of the Himalaya, with 2 m of slip that had impounded several sag ponds. He provided no map of its location, and the fault is not shown on recent maps, nor is it described by later authors. In September 2011 we retraced his footsteps and...

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