Abstract

Multiyear satellite geodetic measurements along the Kuril island arc provided data for studying the condition of the Benioff seismic zone and the occurrence of various deformation mechanisms that are responsible for surface displacements. Factors have been determined whose combination can explain the diverse character of observed movements: space–time variations in interplate sliding, viscoelastic postseismic relaxation in the asthenosphere, stationary backward mantle flow, the keyboard structure of the frontal part of the subduction zone. The stationary displacement components have been detected against the background of transient processes. These components can be associated with interplate coupling and sublithospheric currents and they can be employed in order to characterize the interseismic condition of various parts along the Kuril isalnd arc. In particular, the special character of seismicity in the Middle Kuril area, which consists in long intervals of seismic quiescence interrupted by large double earthquakes, can be caused by a zone of hypothetical transition from strong interplate coupling in the southwest to poor coupling combined with a backward sublithospheric current in the northeast.

中文翻译：

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千岛群岛弧在地震周期不同阶段的地震构造变形：Simushir地震

摘要

沿千岛群岛弧线进行的多年卫星大地测量为研究贝尼奥夫地震带的状况以及造成地表位移的各种变形机制的发生提供了数据。已经确定了可以解释所观察到的运动的各种特征的因素：板间滑动的时空变化，软流层的粘弹性后震松弛，平稳的向后地幔流动，俯冲带前部的键盘结构。在瞬态过程的背景下已经检测到静止位移分量。这些分量可能与板间耦合和岩下电流有关，并且可以用来表征沿千岛等边弧的各个部分的地震条件。尤其是，千岛中部地区地震活动的特殊性，包括由两次大地震中断的较长的地震静止期，可能是由一个从西南板块间强耦合到弱耦合的假想过渡带引起的。在东北向后的岩圈下流。