A Three-Dimensional Seismic Snapshot of Deformed Continental Lithosphere: Interpretation of the BANJO/SEDA Broadband Seismic Data

这项研究包括利用最近完成的BANJO/SEDA被动地震部署的现有数据，继续对安第斯山脉中部的大规模结构进行地震学研究。中部安第斯山脉位于玻利维亚西部和智利北部，是世界上海拔最高、最宽的山脉带之一，局部海拔超过6000米，地壳厚度达75公里，变形延伸到内陆近1000公里。这项研究包括结合使用接收函数分析和区域波形建模，从下行板块的事件中确定一个活动造山带的三维“地震快照”。将未变形的查科地壳柱与过度增厚的Altiplano和Cordilleras进行比较，将用于约束“异常”增厚地壳的起源。预计这一活跃的厚造山带的“地震快照”将为检验高压区域变质作用和过厚地壳深熔作用的思想和模型奠定基础。＊＊＊

9614250 Beck This research ilvolves continued seismological study of the large- scale structure of the central Andes with existing data from the recently completed BANJO/SEDA passive seismic deployments using PASSCAL instrumentation. The central Andes, in western Bolivia and northern Chile, are among the highest and widest mountain belts in the world with elevations locally over 6000 m, crustal thicknesses up to 75 km, and deformation extending inland nearly 1000 km. The research involves use of a combination of receiver function analysis and regional waveform modeling from events in the down- going slab to determine a three-dimensional "seismic snapshot" of an active orogenic belt. Comparison of crustal columns of the un- deformed Chaco with the over-thickened Altiplano and Cordilleras will be used to constrain the origin of the "anomalous" thickened crust. It is expected that this "seismic snapshot" of an active, thick orogen will form the foundation on which to test ideas and models of high-pressure regional metamorphism and anatexis in over- thickened crust. ***