NEW SEISMIC DATA ON THE EURASIAN-AMURIAN LITHOSPHERIC PLATE BOUNDARY IN THE EAST OF RUSSIA (IN THE ALIGNMENT OF SUPPORTING PROFILES 1-SB AND 3-DV)

The modern geodynamics and seismicity of the Far Eastern region are largely determined by the interaction of the Eurasian, Pacific and North American plates, as well as by that of smaller Amurian and Okhotsk plates. Wellknown studies of the configuration and position of boundaries using geological methods are currently supplemented by the results of potential geophysical fields, seismology and space geodesy data interpretation. But despite the abundance of available information, there is ambiguity in location of interplate junction boundaries, particularly of the Amurian and Okhotsk plates, which makes it necessary to use new additional information about plate junction zones. The-past-twodecade deep seismic surveys along the reference geological and geophysical profiles make it possible to clarify the relationship between plate displacements and the deep structure of the Far East region. The comparison was made between the results of seismological and deep seismic sounding (DSS) (on the 1-SB and 3-DV reference geophysical profiles) and the existing geodynamic models in the Eurasian and Amurian lithospheric plates junction area. The confirmation has been provided for the ealier obtained seismic criteria of the boundaries in the Eurasian, Okhotsk and North American plates junction area, which involve a small crustal thickness (37–42 km), low boundary velocity along the Moho (7.85 to 8.0 km/s) and a reduced average (effective) velocity of longitudinal waves in the earth's crust (~6.3 km/s). The Eurasian and Amurian plates junction area along the 1-SB and 8-DV reference profiles is a wide stress zone with a maximum number of earthquakes, a maximum total released energy indicator and smaller hypocentral depths. The CDPM-based deep seismotomographic sections in this zone show an extremely heterogeneous middle crust, as well as poor reflections in the lower crust and in the Moho section.

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