TY - JOUR N2 - The results of the detailed seismoacoustic profilling (CSP, boomar) are presented. The investigation has been carried out in February 1985 and 1988 during two Geodynamical Expeditions organized by the Institute of Geophysics of the Polish Academy of Sciences. The boomar penetration of the caldera floor went down to 150 msec. Four seismoacoustic units of volcanic formations have been determined. The unit A corresponds to pre-caldera series and occurred only in the border part of the flooded caldera. The unit contains mainly pyroclastic rocks (consolidated agglomerates and tuffs) and probably some intercalations of lavas. The units B, C and D fill up the caldera bottom and correspond to post-caldera series. The units are composed of pyroclastic rocks, containing also materials redeposited by lahars, glaciers, landwaters and by wind. The units C and D (the youngest one) were certainly deposited under water. All the units are cut by numerous faults, vents and other types of intrusions. The larger faults, en echelon type, are situated around the bottom and form a ring-fracture. Caldera was formed by succesive stages of collapsing. This process is not finished yet and volcanic activity is still alive (especially in the western part of the flooded caldera). L1 - http://www.journals.pan.pl/Content/111190/PDF-MASTER/1990-3-4_259-266.pdf L2 - http://www.journals.pan.pl/Content/111190 PY - 1990 IS - No 3-4 EP - 266 KW - Antarctica KW - Deception volcano KW - geophysics and geological structures A1 - Kowalewski, Włodzimierz A1 - Rudowski, Stanisław A1 - Zalewski, S. Maciej PB - Polish Academy of Sciences PB - Committee on Polar Research VL - vol. 11 DA - 1990 T1 - Seismoacoustic studies within flooded part of the caldera of the Deception Island, West Antarctica SP - 259 UR - http://www.journals.pan.pl/dlibra/publication/edition/111190 T2 - Polish Polar Research ER -