A Dynamic Model of the Hellenic ARC Deduced from Geophysical Data
A Dynamic Model of the Hellenic ARC Deduced from Geophysical Data
复制标题
根据地球物理数据推导的希腊弧动态模型
DOI：
10.1016/0040-1951(76)90108-6
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发表时间：
1976
期刊：
影响因子：
2.9
通讯作者：
J. Makris
中科院分区：
文献类型：
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作者：
J. Makris
希腊及其邻近地区的重力和地震资料已被用来解释该地区的高地震活动和构造活动。计算出的二维重力模型显示，在爱琴海地区下方，大量热上地幔物质的“羽流”正在上升，造成地壳的强烈衰减。热“羽流”延伸到岩石圈的底部，很可能是通过挤压过程被动员起来的，挤压过程迫使岩石圈下沉到软流圈中。支持上述模型的是：爱琴海地区的高热流；上地幔纵波速度低，为7.7 km/s；密度低于正常水平，延伸至岩石圈底部；希腊地震台站记录的远震p波走时残差约为+2秒；爱琴海地区的火山，其化学成分可以通过假设海洋地壳被上地幔同化来解释；深层地震活动性（200公里），被许多作者解释为贝尼奥夫带。
Combined gravity and seismic data from Greece and the adjacent areas have been used to explain the high seismicity and tectonic activity of this area. Computed 2-D gravity models revealed that below the Aegean region a large “plume” of hot upper-mantle material is rising, causing strong attenuation of the crust. The hot “plume” extends to the base of the lithosphere and has very probably been mobilized through compressional processes that forced the lithosphere to sink into the asthenosphere. The above model is supported by: high heat flow in the Aegean region; low velocity of the compressional waves of 7.7 km/sec for the upper mantle; lower density than normal extending to the base of the lithosphere; teleseismic P-wave travel-time residuals of the order of +2 sec for seismic events recorded at the Greek seismic stations; volcanics in the Aegean area with a chemical composition which can be explained by assuming an assimilation of oceanic crust by the upper mantle; deep seismicity (200 km) which has been interpreted by various authors as a Benioff zone.