The recent geodynamics of the Chukchi Sea and its individual structures is poorly known due to general insufficient geological and geophysical knowledge of the basin, its seismicity included. The operating coastal seismic stations (Fig. 1) are able to register only 7% of all the seismic events occurring in the region [1]. These earthquakes are usually characterized by M = 6 are located near the coastal seismically active zone that comprises the Stuart Peninsula and eastern Chukotka (Fig. 1). Owing to the proximity of seismic stations, numerous weak shallow-focus earthquakes are registered in this area [2]. They are localized in the axial zone of the Stuart Peninsula and in the socalled Chukotka Graben in the eponymous peninsula (Fig. 1), a distinct neotectonic structure that continues in the Chukchi Sea as the Gerald Canyon and proceeds further [3]. The seismicity of the graben is unknown, since seismic stations are located far from the latter. In eastern Chukotka, this structure is marked by numerous hydrothermal vents with the temperature of the discharging waters up to 90 ° C [4]. In a similar neotectonic structure, which is reflected in the bottom topography as the Barrow Canyon and located in the eastern part of the sea near the seismic station at the synonymous cape, numerous earthquakes with M < 6 have been registered [1]. These events and available geological‐geophysical and geomorphologic data [3, 6] indicate potentially high recent geodynamic activity of some structures in the Chukchi Sea. In order to obtain additional indirect information on recent geological processes in this region, the chemical composition of bottom sediments from the Chukchi Sea and adjacent parts of the Arctic Ocean were studied with lithochemical analysis of the results [7]. In so doing, the statistical methods with the software packet STATISTICA 6.0 were used. Bottom sediment samples obtained during expeditions in the framework of the Russian‐American project “RUSALKA” in 2004 and 2006, in the 1st and 2nd Chinese Arctic expeditions, and Cruise 46 of the R/V Professor Khromov in 2002 served as material for this study. Based on the results of the Q-factor analysis (method of main components without rotation) that takes into account variations in the contents of 7 major and 14 minor elements in the selection of 73 samples (Table 1), values of new variable Q factors that provide a more averaged characteristic of sediments than concentrations of chemical elements were obtained. These values substitute to some extent lithochemical modules that are used in the classical lithochemical analysis [7]. Variations in volumes of the first Q factor are determined by the sum contribution of Si, Al, and Fe constituting alumosilicates that represent the main terrigenous component of sediments. Due to the prevalence of terrigenous sedimentation in the Chukchi Sea, the contribution of this factor into variations of the chemical composition of the selection is dominant. Positive values of the second factor are determined by the group of elements characteristic of clayey sediments (Al, Fe, partly, Mg, and Ca), while negative values are peculiar of detrital sediments (Si, Ti). Variations in values of the third, fourth, and fifth Q factors depend on the contents of Ca + Mg, Fe, and Mn, respectively. The tree-clustering analysis (the Ward method with the assessment of the Euclidean distance community), which made it possible to divide all the samples into six clusters, was used for grouping the samples according to their chemical compositions (table). Comparison with the composition of sediments [8‐10], the distribution of clusters relative to contents of some elements (Fig. 2), and their average composition (table) indicate that separation into clusters is determined by the type of sediments and, largely, proportions of the clayey (pel