MACROSEISMIC SURVEY AND CONSTRUCTION OF A DIGITAL ELEVATION MODEL OF THE ALDAN PLATEAU TO STUDY THE NIMNYR EARTHQUAKE

In 2019, the observation network of the Yakutsk branch of the Federal Research Center of the Uni ed Geophysical Service of the Russian Academy of Sciences (YB FRC EGS RAS) became completely digital, and earthquake catalogs became highly representative due to the network density (especially in south Yakutia). The improved registration capabilities de ne the prospects for real-time seismic hazard monitoring. Research on earthquakes is mainly aimed at ensuring the safety of human life. With the development of modern civilization and technical equipment, natural phenomena pose an increasing threat to humans. In addition, earthquakes, even not very strong ones, can cause man-made disasters. The aim of this work was to assess the macroseismic effect of the Nimnyr earthquake in MSK-64 scale points, which was recorded on January 18, 2021 in the Aldan Highlands in South Yakutia. To achieve this goal, the following tasks were formulated: survey of settlements, survey of residents, construction of isoseist maps, and modeling of the terrain. This paper presents the data of macroseismic survey in the epicentral zone of the earthquake. The data obtained represent the primary factual material collected on the basis of “fresh traces” and gives an idea of the intensity of shaking in the far and near zones and the exact location of the earthquake source. A survey of settlements and a survey of residents made it possible to assess the macroseismic effect in points of the MSK-64 scale. An isoseismic map of the seismic event was constructed. Some materials of remote sensing data processing for building a digital terrain model are presented. The constructed digital model will make it possible to track the consequences of tremors, leading to negative and positive landforms, which can be of great height and steepness.

Nimnyr earthquake, energy class, intensity, earthquake source, epicenter, seismotectonic boundaries, score, macroseismic survey, interpolation, digital terrain model

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