Seismic evidence for asthenospheric updoming beneath the western Bohemian Massif, central Europe
Seismic evidence for asthenospheric updoming beneath the western Bohemian Massif, central Europe
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中欧西波希米亚地块下方软流圈上隆的地震证据
DOI：
10.1029/2005gl025158
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发表时间：
2006
影响因子：
5.2
通讯作者：
H. Kämpf
中科院分区：
文献类型：
--
作者：
B. Heuer;W. Geissler;R. Kind;H. Kämpf
详细的岩石圈下的波希米亚地块西部的图像得到了超过8500 P接收功能的分析。在里根斯堡-莱比锡-罗斯托克带和埃格裂谷的交汇处，地壳厚度从大约20公里减少到26公里。周围31公里。接收函数在延迟时间约6 s时出现正相，在7 ~ 8 s时出现强负相，与莫霍面隆起、CO2幔源脱气和震群活动区相吻合。这些阶段可以通过在50公里处速度增加和在65公里深度处速度减小来模拟。速度的降低，观察到超过5300平方公里的面积，提供了证据，当地软流圈隆起和/或封闭的身体部分熔融，这可能是高CO2地幔流体流动和地震群活动的原因，在这个最近nonvolcanic，陆内裂谷地区。
Detailed images of the lithosphere beneath the western Bohemian Massif were obtained by analysis of more than 8500 P receiver functions. At the intersection of Regensburg‐Leipzig‐Rostock zone and Eger Rift, crustal thickness decreases to 26 km from approx. 31 km in the surroundings. The receiver functions display a positive phase at about 6 s delay time and a strong negative phase at 7 to 8 s, which coincides with an area of Moho updoming, CO2 mantle‐derived degassing and earthquake swarm activity. These phases can be modeled by a velocity increase at 50 km and a velocity decrease at 65 km depth. The velocity decrease, observed over an area of 5300 km2, gives evidence for local asthenospheric updoming and/or a confined body of partial melt, which might be the cause for high CO2 mantle fluid flow and earthquake swarm activity in this recently nonvolcanic, intracontinental rift area.