Quaternary tsunami events in the eastern Ionian Sea - reconstructing and modelling extreme events based on interdisciplinary geo-scientific investigations

东爱奥尼亚海第四纪海啸事件——基于跨学科地球科学研究的极端事件重建和建模

基本信息

批准号：
77309729
负责人：
Professor Dr. Helmut Brückner
金额：
--
依托单位：
Geographisches Institut
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2012-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/77309729?language=en
关键词：
Quaternary tsunami events eastern Ionian

项目摘要

The Greek coast between the Ambrakian Gulf and the southern Peloponnese is exposed to the highly tsunamigenic Hellenic Trench. It is characterized by outstanding geomorphological and sedimentological evidence of multiple strong tsunami landfalls. On a (supra-)regional scale, the eastern Ionian Sea tsunami research project focuses on the reconstruction and modelling of Holocene tsunami impacts and their influence on the long-term coastal evolution. Onshore tsunami deposits such as runup and backwash deposits, dislocated mega-blocks and allochthonous sedimentary traces in coastal plain deposits are valuable instruments to reconstruct palaeotsunami events. Event deposits, partly retrieved from vibracores, will be studied by geomorphological, sedimentological, micromorphological, micropalaeontological, geochemical and palaeoenvironmental analyses. Radiocarbon and OSL-datings are first-choice methods to establish a tsunami geochronology. Geoarchaeological studies will help to check how ancient coastal settlements were affected by (palaeo-)tsunami impacts. Field and laboratory studies will result in a GIS-related tsunami field parameter database to adapt and refine computer models of tsunami landfall and long-term coastal evolution. Computer modelling approaches will be based on wave and hydraulic theories, regional digital elevation models and high-resolution remote sensing data and take into account submarine mass movements and/or vertical plate dislocations as potential triggers. The interdisciplinary project is embedded in an international research network and shows a large innovative potential, especially by the application of (i) laser scan photogrammetric methods for modelling mega-block dislocations and (ii) 36Cl surface exposure dating for assessing the age of tsunami deposits and cross-checking other dating methods.

安布拉克湾和伯罗奔尼撒半岛南部之间的希腊海岸暴露在极易引发海啸的希腊海沟之下。它的特点是具有多次强烈海啸登陆的显着地貌和沉积学证据。在（超）区域尺度上，东部爱奥尼亚海海啸研究项目重点关注全新世海啸影响的重建和建模及其对长期海岸演化的影响。陆上海啸沉积物，如上升和反冲沉积物、错位巨型块体和沿海平原沉积物中的异地沉积痕迹，是重建古海啸事件的宝贵工具。部分从振动核心中回收的事件沉积物将通过地貌学、沉积学、微形态学、微古生物学、地球化学和古环境分析进行研究。放射性碳和光释光测年是建立海啸地质年代学的首选方法。地质考古学研究将有助于检查古代沿海定居点如何受到（古）海啸的影响。现场和实验室研究将产生与地理信息系统相关的海啸现场参数数据库，以适应和完善海啸登陆和长期海岸演变的计算机模型。计算机建模方法将基于波浪和水力理论、区域数字高程模型和高分辨率遥感数据，并考虑海底质量运动和/或垂直板块位错作为潜在的触发因素。该跨学科项目嵌入国际研究网络，显示出巨大的创新潜力，特别是通过应用（i）激光扫描摄影测量方法来模拟巨型块位错和（ii）36Cl表面暴露测年法来评估海啸沉积物的年龄并交叉检查其他约会方法。