Abstract

In the area of the village of Chupa, three isolated ranges of paleoseismic dislocations were revealed, marking a NW-trending linear seismogenic structure and a total length of more than 14 km . The dislocations are young tectonic ditches and fissures, mainly trending NW, mass displacements of blocks, including against the slope, disarrayed stones, and seismic landslides. Using the nature of the distribution of seismic dislocations for two areas, isoseismic maps were constructed, which made it possible to estimate the magnitudes of paleoseismic events using the macroseismic technique. They amounted to 3.7 and 2.9, respectively, with a focal depth of H ≤ 1 km under the assumption that each range corresponds to a local seismic source. The isolated character of the distribution of the identified ranges may be associated with another, more severe paleoearthquake, traces of which have been preserved mainly in elevated areas of the relief (above 80 m). In the Early Holocene, these sites were separate islands, since the formation conditions for dislocations were limited to subaquatic spaces. For this variant, M = 5.5 and H = 5 km were calculated; the age of the event is the Early Holocene. The results, taking into account data on the micrograben of the Great Salma Strait, indicate the periodic occurrence of coastal and mainland faults, subparallel to the axis of the Kandalaksha graben, as well as Holocene shallow-focus earthquakes of medium magnitude with an epicentral intensity up to I = VIII on the ESI-2007 scale. A catalog of postglacial paleoearthquakes of the Kandalaksha graben region has been compiled (5 events), which can be used to construct earthquake recurrence graphs. This will make it possible to substantially refine the seismic regime of this structure.

中文翻译：

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Kandalaksha Graben地区Chupa（北卡累利阿）地区的地震成因结构识别和古地震参数化

摘要

在丘帕村地区，揭示了三个孤立的古地震位错范围，标志着西北走向的线性地震发生结构，总长度超过14 km。错位是年轻的构造性沟渠和裂缝，主要是西北走向，块体的大量位移，包括对斜坡，乱石和地震滑坡。利用两个地区地震位错的分布性质，构造了等震图，这使得利用大地震技术估计古地震事件的幅度成为可能。它们分别为3.7和2.9，焦深为H假设每个范围对应于本地地震源，则≤1 km。确定范围分布的孤立特征可能与另一次更严重的古地震有关，其痕迹主要保存在浮雕的高起区域（80 m以上）。在全新世早期，这些位点是单独的岛屿，因为位错的形成条件仅限于水下水域。对于此变体，M = 5.5，H= 5公里；事件发生的年龄是全新世。考虑到大萨尔玛海峡微颗粒的数据，结果表明沿海和大陆断层的周期性发生，平行于坎达拉克沙grab的轴线，以及中等震度的全新世浅震，震中强度在ESI-2007规模上，最高为I = VIII。编制了坎达拉克沙grab地区的冰川后古地震目录（5个事件），可用于构造地震复发图。这将有可能大大改善该结构的抗震性能。