Gravity modelling along the ECORS-CROP vertical seismic reflection profile through the Western Alps
Gravity modelling along the ECORS-CROP vertical seismic reflection profile through the Western Alps
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沿西阿尔卑斯山 ECORS-CROP 垂直地震反射剖面的重力建模
DOI：
10.1016/0040-1951(89)90244-8
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
D. Rey
中科院分区：
文献类型：
--
作者：
R. Bayer;M. Carozzo;R. Lanza;M. Miletto;D. Rey
利用来自500个台站的新重力数据和以前在西阿尔卑斯山进行的所有调查的结果，沿着ECORS-CROP垂直地震剖面编制了详细的剖面。布格异常由两个近似二维的区域特征组成，即出现在带中部的广泛的负异常和阿尔卑斯山与波河平原交界的地球物理“伊夫雷亚带”的明显正异常。广角地震活动的结果和垂直地震的初步划线是异常建模的主要制约因素。提出了两种模型。它们的共同特征是地壳厚度最大的盆状带和“伊夫雷亚带”的地壳-上地幔单元堆积。阿普利亚下地壳对正异常的贡献比以前认为的要大。对于具有合理地震信息的区域，提出了几个假设，以说明其地质解释的不确定性。密度模型与欧洲板块与阿普利亚板块碰撞的岩石圈增生过程假说相一致。
New gravity data from 500 stations and results from all previous surveys on the Western Alps are used to compile a detailed profile along the ECORS-CROP vertical seismic profile.The Bouguer anomaly consists of two approximately two-dimensional regional features, namely a wide negative anomaly occurring on the central part of the belt and the pronounced positive anomaly of the geophysical “Ivrea zone”, at the border between the Alps and the Po Plain.The results of a wide-angle seismic campaign and the preliminary line drawing from the vertical seismic have been the main constraints for the modelling of the anomaly. Two models are proposed. Their common feature is a piling up of the crust-upper mantle units in the Penninic zone of maximum crustal thickness as well as in the “Ivrea Zone”. The contribution of the Apulian lower crust to the positive anomaly is greater than formerly suggested. Several hypotheses are put forward for the zones where reasonable seismic information is available, as an illustration of the uncertainties surrounding their geological interpretation.The density models are consistent with the hypothesis of lithospheric accretionary processes for the collision between the European and Apulian plates.