Abstract
We present the results of a paleoseismic trench investigation of an 8-m scarp at the mouth of Marbang Korong Creek (27°58'26.0700 N 95°13'42.3000 E) within the meizoseismal area of the 1950 Assam earthquake along the northeast Himalayan Frontal Thrust (HFT) of India. Structural, stratigraphic, and growth- stratigraphy relations observed in the trench are interpreted to indicate that expression of the scarp is due to uplift and folding of near surface sediments in response to HFT displacement that reaches near the surface yet below the 5-m depth of the trench exposure. The most recent contribution to scarp growth dates to fault displacement post 2009 cal yr B.P. It remains a matter of speculation whether or not the most recent event deformation is a result of the great 1950 Assam earthquake that is reported on the basis of intensity data. Online Material: High-resolution trench log 5 and table summarizing results and inputs of radiocarbon analysis of detrital charcoal samples.
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