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The return periods of Karakoram glacier surges are poorly quantified. Here, we present evidence of an his- toric surge of the Khurdopin Glacier that began in the mid- 1970s and peaked in 1979. Measured surface displacements reached > 5 km a 1 , two orders of magnitude faster than dur- ing quiescence. The Khurdopin Glacier next surged in the late 1990s, equating to a return period of 20 years. Surge evolution in the two events shows remarkable similarity sug- gesting a common trigger. Surge activity in the Karako- ram needs to be better understood if accurate mass balance assessments of Hindu-Kush-Karakoram-Himalaya glaciers are to be made.

Brief Communication: On the magnitude and frequency of Khurdopin glacier surge events