The Late Tertiary-Quaternary onshore tsunami record of nothern Chile and southern Peru: towards the recognition of diagnostic features of onshore tsunami deposits (short title: Chile-Peru tsunami deposits)

由于缺乏迄今为止公认的独特诊断特征，陆上和海上海啸沉积物的识别变得困难。海啸在这两种环境中存款沉积物的流体动力学过程也是未知的。然而，陆上沉积物的识别对于建立盆地边缘的海啸记录和评估其海啸风险至关重要。在拟议的项目中，我们将研究保存在北方智利和秘鲁南部海岸的海洋阶地上的晚第三纪至第四纪海啸沉积物。我们将测量现场的矿床，推导出启动参数，并对硅质矿床进行取样，进行系统的粒度分析。AMS-14 C、ERS和OSL对沉积物的定年将建立并更好地确定迄今为止非常零碎的局部记录，然后将其与其他太平洋边缘进行比较，以区分局部和区域海啸。获得的粒度数据将提高我们对海啸上升的流体动力学的理解，现场数据将表明海啸对海岸的影响程度。合并后的数据集最终将对影响智利北方和秘鲁南部海岸的海啸灾害和风险的空间和时间提供更有代表性的评估。

The recognition of onshore and offshore tsunami deposits is made difficult by the absence of hitherto recognized uniquely diagnostic features. Also unknown is the hydrodynamical process by which tsunami deposit sediment in both environments. However, the recognition of onshore deposits in particular is crucial to establishing the tsunami record of a basin margin and to evaluating its tsunami risk.- In the proposed project we will study Late Tertiary to Quaternary tsunami deposits preserved on marine terraces at the coasts of northern Chile and southern Peru. We will measure the deposits in the field, derive run-up parameters and sample the siliciclastic deposits for systematic grain-size analysis. Dating of the deposits by AMS-14C, ERS and OSL will establish and better define a hitherto very fragmentary local record which then can be compared to other Pacific margins to differentiate local and regional from teletsunami. The grain-size data to be obtained will improve our understanding of the hydrodynamics of tsunami run-up, the field data will indicate the magnitude of the tsunami impacts at the coasts. The combined data set will finally offer a more representative assessment of the spatial and temporal tsunami hazard and risk affecting the coasts of northern Chile and southern Peru.