Abstract

Our seismotectonic studies focus on active segments of the junction zone of the Kolyma–Omolon superterrane and the South Anui suture. The aim of our research is to identify features that show activation of suture zones and to determine the parameters of the stress–strain state of the crust in the study area. The analysis was based on the average seismotectonic deformation tensors, which were estimated for the main epicentral fields of Russia’s northeastern regions. New data are now available on the focal characteristics of moderate earthquakes, which can improve determination of the kinematic types of junctions of suture zones of the tectonic taxa located along the Arctic and Pacific continental margins. Seismotectonic crustal destruction regimes are determined for the active segments of the junction zone of the Kolyma–Omolon superterrane and the South Anui suture. These regimes are influenced by global geodynamic processes taking place at lithospheric plate margins, as well as by the dominant deformation fields of adjacent tectonic taxa. The seismotectonic analysis results suggest activation of the suture zones of the northwestern flank of the Kolyma–Omolon superterrane under stable north-eastward compression. The suture zones may extend into the Laptev Sea area, where they are conjugate with the structural elements of the South Anui suture (Novosibirsk–Svyatoi Nos segment). In the Anui–Chukotka segment of the suture, seismotectonic crustal destruction changes from compression to extension. This is due to the effect of deformation fields of active megazones of conjugated tectonic taxa of the Novosibirsk–Chukotka fold-and-thrust and Okhotsk–Chukotka active margin zones. For the tectonic taxa of the Arctic sector of Russia’s northeastern regions, a database has been consolidated, including the of seismotectonic crustal deformation parameters, which may be useful for various geodynamic reconstructions.

中文翻译：

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Kolyma-Omolon地层与南阿努伊缝合线（俄罗斯东南部）交界处活动段的地震构造变形

摘要

我们的地震构造研究关注Kolyma-Omolon地层和South Anui缝合线交界带的活动段。我们研究的目的是确定可显示缝合区域活化作用的特征，并确定研究区域中地壳的应力-应变状态参数。该分析基于平均地震构造张量，估计了俄罗斯东北地区主要震中场。现在可获得有关中度地震震源特征的新数据，这可以改善对沿北极和太平洋大陆边缘的构造分类单元的缝合带交界处的运动学类型的确定。确定了Kolyma-Omolon上层地层和South Anui缝合线交界带活动段的地震构造地壳破坏机制。这些制度受到岩石圈板块边缘发生的全球地球动力学过程以及邻近构造分类单元的主要变形场的影响。地震构造分析结果表明，在稳定的东北向压缩作用下，科利马—奥莫隆超地层西北翼的缝合线区域被激活。缝线区可能延伸到拉普捷夫海地区，在这里与南阿努伊缝线的结构要素（新西伯利亚–斯维加托号段）共轭。在缝合的Anui–Chukotka段中，地震构造地壳破坏从压缩变为延伸。这是由于新西伯利亚-楚科奇褶皱-冲断和鄂霍次克-楚科奇活动边缘带的共生构造类群活动兆区的变形场的影响。对于俄罗斯东北地区北极地区的构造分类单元，已合并了一个数据库，其中包括地震构造地壳变形参数，这可能对各种地球动力重建有用。