Seismic imaging of the newly discovered Sub-Lithospheric Discontinuity (SLD) in the larger Alpine region

大阿尔卑斯地区新发现的亚岩石圈不连续面（SLD）的地震成像

• 批准号: 362420976
• 负责人: Professor Dr. Rainer Kind
• 金额: --
• 依托单位: Fachrichtung Geophysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/362420976?language=en
• 关键词: Seismic; imaging; newly; discovered; Sub

Kind et al. (2016, see attachment) discovered with seismic receiver functions below the in central Europe about 100 km deep lithosphere-asthenosphere boundary (LAB) a new so far unknown negative (downward velocity decrease) discontinuity which they called Sub-Lithospheric Discontinuity (SLD). The SLD is in the Pannonian Basin about 150 km deep, reaches below the Bohemian Massif 300 km and jumps abruptly upward to 200 km below the north German Basin and the east European craton. So far there exists no generally accepted geological interpretation of the SLD. Kind et al. (2016) observed below the eastern Alps the LAB down to about 150 km depth without being able to resolve the subduction direction. On the whole our observations and others show that the S-receiver function technique is probably the method with highest resolution for upper mantle discontinuities. The SLD under the Alpine region has been observed only with low resolution with the existing data of the permanent stations. The large density of the AlpArray stations should be able to resolve the question if the central European SLD is connected to the east European craton or to the from the south accreting terranes. In particular we will study the topography of the SLD and other upper mantle discontinuities below the larger Alpine region which is important for studies of the geodynamic relations. In addition we will study the sharpness of the seismic discontinuities with the help of theoretical seismograms, which is important for the petrological interpretation. Finally we plan to compare receiver function velocity model with such observed with surface wave tomography to ensure correctness of the models.These projects fit into the first Research Theme RT1 'Reorganisation of the Lithosphere during Mountain Building'and in the data collecting Activity Fields: AF-A (UNIBRAS/DSERBA), AF-B (LOBSTER), AF-C (Swath C: From Apennines to Alps) AF-D (Swath D: across central and easter Alps).

Kind等人（2016年，见附件）在欧洲中部约100 km深的岩石圈-软流圈边界（LAB）以下的地震接收器功能中发现了一个新的迄今未知的负（向下速度减小）不连续性，他们称之为亚岩石圈不连续性（SLD）。SLD位于Pannonian盆地约150 km深，到达波希米亚地块300 km以下，并突然向上跳跃到德国北部盆地和东欧克拉通以下200 km。到目前为止，还没有普遍接受的SLD地质解释。Kind等人（2016年）在东阿尔卑斯山下观察到LAB下降到约150公里的深度，但无法分辨俯冲方向。总的来说，我们的观测和其他人表明，S-接收函数技术可能是上地幔不连续性的最高分辨率的方法。 阿尔卑斯山地区的SLD仅以低分辨率与现有的数据的永久站进行了观察。AlpArray站的大密度应该能够解决中欧SLD是否连接到东欧克拉通或从南部增生岩的问题。特别是，我们将研究地形的SLD和其他上地幔不连续下面的更大的阿尔卑斯地区，这是重要的研究地球动力学的关系。此外，我们还将借助理论地震图研究地震不连续面的锐度，这对岩石学解释很重要。最后，我们计划将接收函数速度模型与面波层析成像观测结果进行比较，以确保模型的正确性。这些项目符合第一个研究主题RT 1“造山运动期间岩石圈的重组”和数据收集活动领域：AF-A（UNIBRAS/DSERBA），AF-B（LOBSTER），AF-C（Swath C：From Apennines to Alps）AF-D（Swath D：across central and easter Alps）.