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Vrancea slab earthquakes triggered by static stress transfer

机译：静应力传递触发的范朗西平板地震

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The purpose of this paper is to study the interaction of the Vrancea seismic activity (Romania) in space as result of Coulomb, static stress transfer during M = 7 + events. In this area, three large events occurred in 1977, 1986 and 1990 at mid-lower, lithospheric depths and with similar focal mechanisms. Assuming elastic rheology for the deforming rocks it is suggested that frictional sliding on pre-existing fault produced the 1986 M = 7.1 event (depth 131 km), that was possibly triggered by the 1977 M = 7.4 event (depth 94 km). We calculated a static stress transfer of 0.52-0.78 bar to the hypocentre of the 1986 event. On the contrary, the occurrence of the 1990 event is uncertain: it is located inside the relaxed (shadow) zone of the combined 1977 and 1986 static stress field considering an azimuth for maximum compression of N307° E. It follows that, the 1990 earthquake most likely represents an unbroken patch (asperity) of the 1977 rupture plane that failed due to loading. However, if a different compression azimuth is assumed (N323° E) then the 1990 event was also possibly triggered by static stress transfer of the 1977 and 1986 events (combined). Our modeling is a first-order approximation of the kind of earthquake interaction we might expect at intermediate lithospheric depths (80-90 to 130-140 km). It is also suggested that static stress transfer may explain the clustering of Vrancea earthquakes in space by the rupturing of two (possibly three) NW-dipping major zones of weakness (faults) which accommodate the extension (vertical elongation) of the slab.
机译：本文的目的是研究由于库仑，M = 7 +事件期间静态应力传递而导致的Vrancea地震活动（罗马尼亚）在空间中的相互作用。在该地区，1977年，1986年和1990年在岩石圈的中下深度和类似的震源机制发生了三起大型事件。假设变形岩石具有弹性流变学，则表明在既存断层上的摩擦滑动产生了1986 M = 7.1事件（深度131 km），这可能是由1977 M = 7.4事件（深度94 km）触发的。我们计算了1986年事件的震中向0.52-0.78 bar的静态应力传递。相反，1990年事件的发生是不确定的：考虑到最大压缩N307°E的方位角，它位于1977年和1986年组合静应力场的松弛（阴影）区域内。其后是1990年地震最有可能代表1977年破裂平面的完整片段（粗糙性），该破裂由于载荷而失效。但是，如果假定使用不同的压缩方位角（N323°E），则1977年和1986年事件（组合）的静态应力传递也可能触发了1990年事件。我们的建模是我们在中等岩石圈深度（80-90至130-140 km）可能期望的地震相互作用的一阶近似。也有人提出，静应力传递可以通过两个（可能是三个）NW浸入的主要薄弱区域（断层）的破裂来解释空间中弗拉切纳地震的群集，这些薄弱区域（断层）可以容纳平板的延伸（垂直延伸）。

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