苏沪浙海岸的地震海啸增水

江苏、上海和浙江地区的地震海啸增水研究自20世纪80年代开始,研究结果为沿海重大工程建设提供了地震海啸设防的基本数据。地震海啸历史文献记录表明,可能在该地区产生显著增水的海啸主要发生在南黄海海域和台湾附近海域。在琉球隆褶区发生的地震海啸受到冲绳海槽、钓鱼岛隆褶带的阻滞,在向东海陆架浅水区传播过程中进一步衰减,由此产生的海啸增水只有在现代仪器记录上才能分辨出来,通常不会在该地区产生灾害。在识别该研究区的潜在海啸源工作的基础上,用数值方法分析研究了海啸波传播过程,结果认为该地区受到的地震海啸影响不大于风暴潮,这一结论与历史记录相符。

Study on Sea Level Uplift during Tsunami along Coast of Jiangsu-Shanghai-Zhejiang Area

The study on tsunami in Jiangsu-Shanghai-Zhejiang region was begun in the 1980s,which was mainly to provide possible tide height for construction in this region. According to historic records,tsunamis leading to hazard along the coast of this area happened only on continental shelfs,such as in Earst Sea Shelf Basin and Sea around Taiwan Island. Because the tsunami were atterrnuated by Okinawa ocean trough and Diaoyu islands bending fold belt,and futher atterrnuated in shellow water area of shelf,the tide resulted by the tsunami out of continental shelf can be recorgnized only in modern tide observation recordes. The potential tsunami sources were idenfied and the tsunami progression procedure in the region is simulated by numerical method. The result shows that the damage of tsunami is no larger than that of storm tide,which is in agreement with historical records.