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首页> 外文期刊>Journal of geodynamics >Focal mechanisms of shallow and intermediate depth earthquakes along the Hellenic Arc
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Focal mechanisms of shallow and intermediate depth earthquakes along the Hellenic Arc

机译：希腊弧沿中浅层地震的震源机制

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The active tectonics of the southern Aegean Sea, a region of intense shallow and intermediate depth seismicity, is studied based on well-constrained focal mechanisms. We use the focal mechanisms of 28 earthquakes (with moment magnitudes M > 4.9) of the period 1977-2002 whose source parameters we determined from inversion of body waves and the focal mechanisms of 85 other earthquakes to re-examine the style of faulting in the shallow and deeper parts of the subducting slab. The deepest event that we studied has depth of ～ 160 km. The combined data set of focal mechanisms, indicate the following, starting from south to north: (a) NW-SE compression with thrusts along the outer central Mediterranean Rise; (b) reverse and low angle thrust faulting at depths up to 40 km with P axis having a constant direction which is almost perpendicular to the strike of the arc, in the western and central parts and parallel to the arc in the eastern part; (c) normal faulting with E-W trending T-axes showing along-arc extension at depths up to 40 km; and (d) strike-slip faulting with P-axes parallel to the strike of the arc for events deeper than 40 km. Of special interest is the area between the island of Zante and the western coasts of Peloponnese where shallow and deeper events are of strike-slip faulting. The eastern part of the Hellenic arc exhibits a different behaviour than the western and central part. In the eastern part P-axes for both shallow and deeper events have the same NE-SW parallel to the arc trend. This is not the case in the western and central part of the arc where there is a clear discrimination between shallow and deeper events. In the eastern part the angle of the subducting plate is steeper than the other parts and the T - axes are well aligned along dip of the subducting plate. If for the deeper than 40 km events the ～ E-W trending planes are assumed as the fault planes, then the western parts of the arc (Kythira, Milos islands) are connected to dextral strike-slip motions while the eastern parts (near Rodos Island) are connected to sinistral strike-slip motions.
机译：基于充分约束的震源机制，研究了爱琴海南部（一个浅浅和中深度地震活动强烈的地区）的活跃构造。我们使用1977-2002年期间28次地震（震级M> 4.9）的震源机制，我们根据体波反演和其他85次地震的震源机制确定了震源参数，以重新检验地震的断层类型。俯冲板的浅，深部分。我们研究的最深事件的深度约为160 km。震源机制的综合数据集表明，从南到北依次为：（a）NW-SE压缩，外地中海中部隆起有推力； （b）反向和小角度推力断层，深度达40 km，P轴的恒定方向在西部和中部几乎垂直于电弧走向，在东部平行于电弧； （c）正常的断层，E-W趋势T轴在40 km深度处显示出沿弧的延伸； （d）对于深度大于40 km的事件，P轴的走滑断层与弧的走线平行。特别有趣的是Zante岛和伯罗奔尼撒西部海岸之间的区域，那里浅而深的事件是走滑断层。希腊弧的东部表现出与西部和中部不同的行为。在东部，浅事件和深事件的P轴都具有与弧线趋势平行的NE-SW。在弧线的西部和中部情况并非如此，在浅层事件和深层事件之间存在明显的区别。在东部，俯冲板的角度比其他部分陡，T轴沿着俯冲板的倾角很好地对齐。如果对于深度超过40 km的事件，以〜EW趋势平面为断层平面，则弧的西部（Kythira，米洛斯群岛）与右旋走滑运动有关，而东部（罗多斯岛附近）与左弦走滑运动有关。

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