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The Tsunami Caused by the 30 October 2020 Samos (Aegean Sea) Mw7.0 Earthquake: Hydrodynamic Features, Source Properties and Impact Assessment from Post-Event Field Survey and Video Records
Journal of Marine Science and Engineering ( IF 2.9 ) Pub Date : 2021-01-11 , DOI: 10.3390/jmse9010068 Ioanna Triantafyllou , Marilia Gogou , Spyridon Mavroulis , Efthymios Lekkas , Gerassimos A. Papadopoulos , Manolis Thravalos
Journal of Marine Science and Engineering ( IF 2.9 ) Pub Date : 2021-01-11 , DOI: 10.3390/jmse9010068 Ioanna Triantafyllou , Marilia Gogou , Spyridon Mavroulis , Efthymios Lekkas , Gerassimos A. Papadopoulos , Manolis Thravalos
The tsunami generated by the offshore Samos Island earthquake (Mw = 7.0, 30 October 2020) is the largest in the Aegean Sea since 1956 CE. Our study was based on field surveys, video records, eyewitness accounts and far-field mareograms. Sea recession was the leading motion in most sites implying wave generation from seismic dislocation. At an epicentral distance of ~12 km (site K4, north Samos), sea recession, followed by extreme wave height (h~3.35 m), occurred 2′ and 4′ after the earthquake, respectively. In K4, the main wave moved obliquely to the coast. These features may reflect coupling of the broadside tsunami with landslide generated tsunami at offshore K4. The generation of an on-shelf edge-wave might be an alternative. A few kilometers from K4, a wave height of ~1 m was measured in several sites, except Vathy bay (east, h = 2 m) and Karlovasi port (west, h = 1.80 m) where the wave amplified. In Vathy bay, two inundations arrived with a time difference of ~19′, the second being the strongest. In Karlovasi, one inundation occurred. In both towns and in western Turkey, material damage was caused in sites with h > 1 m. In other islands, h ≤ 1 m was reported. The h > 0.5 m values follow power-law decay away from the source. We calculated a tsunami magnitude of Mt~7.0, a tsunami source area of 1960 km2 and a displacement amplitude of ~1 m in the tsunami source. A co-seismic 15–25 cm coastal uplift of Samos decreased the tsunami run-up. The early warning message perhaps contributed to decrease the tsunami impact.
中文翻译:
2020年10月30日萨摩斯岛(爱琴海)Mw7.0地震引起的海啸:事后现场调查和视频记录的水动力特征,震源特性和影响评估
萨摩斯岛近海地震(M w= 7.0,2020年10月30日)是自1956年以来爱琴海最大的。我们的研究基于野外调查,视频记录,目击者陈述和远场象形图。在大多数地点,海退是主导运动,暗示着地震错位产生了波。在震中距离约为12 km(萨摩斯北部K4站点)时,地震后2'和4'分别发生了海退,接着是极端波高(h〜3.35 m)。在K4中,主浪向海岸倾斜。这些特征可能反映了宽边海啸与海上K4滑坡产生的海啸的耦合。架上边缘波的产生可能是一种替代方法。距K4几公里处,除了Vathy湾(东,h = 2 m)和Karlovasi港口(西,h = 1.80 m)在波放大处,在几个地点测得的波高均为〜1 m。在瓦西湾,两次淹没到达的时间差约为19′,第二次是最强的。在Karlovasi,发生了一次洪水。在两个城镇和土耳其西部,h> 1 m的地点都造成了物质损失。在其他岛屿,据报道h≤1 m。h> 0.5 m值遵循幂律衰减,远离源。我们计算了M的海啸震级吨〜7.0,1960公里海啸源区2和的约1米的海啸源的位移幅度。萨摩斯岛15-25厘米的同震沿海隆升减少了海啸爆发。预警信息也许有助于减少海啸的影响。
更新日期:2021-01-11
中文翻译:
2020年10月30日萨摩斯岛(爱琴海)Mw7.0地震引起的海啸:事后现场调查和视频记录的水动力特征,震源特性和影响评估
萨摩斯岛近海地震(M w= 7.0,2020年10月30日)是自1956年以来爱琴海最大的。我们的研究基于野外调查,视频记录,目击者陈述和远场象形图。在大多数地点,海退是主导运动,暗示着地震错位产生了波。在震中距离约为12 km(萨摩斯北部K4站点)时,地震后2'和4'分别发生了海退,接着是极端波高(h〜3.35 m)。在K4中,主浪向海岸倾斜。这些特征可能反映了宽边海啸与海上K4滑坡产生的海啸的耦合。架上边缘波的产生可能是一种替代方法。距K4几公里处,除了Vathy湾(东,h = 2 m)和Karlovasi港口(西,h = 1.80 m)在波放大处,在几个地点测得的波高均为〜1 m。在瓦西湾,两次淹没到达的时间差约为19′,第二次是最强的。在Karlovasi,发生了一次洪水。在两个城镇和土耳其西部,h> 1 m的地点都造成了物质损失。在其他岛屿,据报道h≤1 m。h> 0.5 m值遵循幂律衰减,远离源。我们计算了M的海啸震级吨〜7.0,1960公里海啸源区2和的约1米的海啸源的位移幅度。萨摩斯岛15-25厘米的同震沿海隆升减少了海啸爆发。预警信息也许有助于减少海啸的影响。