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Jaegyu Knoll is located in Antarctic Sound, between Trinity Pen- insula and islands of the Joinville Island Group, on the northern Antarctic Peninsula (Fig. 1a). Jaegyu Knoll is interpreted as a Holocene submarine intraplate volcano based on its morphology, in situ observations such as bottom videos and high-resolution photographs (Quinones et al. 2005), a rock dredge that recovered fresh volcanic rock (Hatfield et al. 2004) and a measured geother- mal anomaly (Hatfield et al. 2004). All aspects of the knoll are con- sistent with recent volcanic activity, which appears to have been persistent in the northern Antarctic Peninsula region from Meso- zoic times to the present (e.g. Baker et al. 1973; Gonza ́lez-Ferra ́n 1991; Gracia et al. 1997). The knoll, and at least two other smaller volcanic features in Antarctic Sound (Fig. 1a), lie within an over- deepened glacial trough that was presumably sculpted by ice dur- ing the Last Glacial Maximum (LGM; 23–19 ka BP).