Earthquake parameters and spatial distribution of coseismic effects in Southern Siberia and Mongolia

In this work we review earthquakes that happened in Southern Siberia and Mongolia within the coordinates of 42°–62° N and 80°–124° E and first propose relationships between earthquake parameters (a surface-wave earthquake magnitude M _s and an epicentral intensity(I ₀) based on the MSK-64 scale) and maximal distances from an earthquake epicenter (R _{e max}), hypocenter (R _{h max}), and a seismogenic fault (R _{f max}) to the localities of secondary coseismic effects. Special attention was paid to the study of these relationships for the effects of soil liquefaction. Hence, it was shown that secondary deformations from an earthquake were distributed in space away from an earthquake epicenter, than from an associating seismogenic fault. The effects of soil liquefaction are manifested by several times closer to a seismogenic fault, than all other effects, regardless of the type of tectonic movement in a seismic focus. Within the 40 km zone from an earthquake epicenter 44% of the known manifestations of liquefaction process occurred; within the 40 km zone from a seismogenic fault—90%. We propose the next relationship for effects of soil liquefaction: M _s = 0.007 × R _{e max} + 5.168 that increases the limits of the maximum epicentral distance at an earthquake magnitude of 5.2 ≤ M _s ≤ 8.1 as compared to the corresponding relationships for different regions of the world.