On the generation of secondary microseisms observed in northern and central Europe -: art. no. 2506
On the generation of secondary microseisms observed in northern and central Europe -: art. no. 2506
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DOI：
10.1029/2002jb002338
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发表时间：
2003-10-29
影响因子：
3.9
通讯作者：
Grevemeyer, I
中科院分区：
文献类型：
--
作者：
Essen, HH;Krüger, F;Grevemeyer, I
[1]将来自四个欧洲宽带台站以及来自苏格兰、挪威和德国的三个地震台阵的微震记录与北大西洋海洋波场的模型波数据和来自挪威海岸北纬60度的当地海浪数据进行比较，两者都是在2000年2月至3月期间测量的。两种方法已被测试，以确定产生的微震能量的区域：一个新的振幅相关技术和波束反投影从三个地震台阵。这两种技术都表明，主要的生成区域位于挪威西南部和苏格兰北部沿海的特定地区。远离这些发生区的地震台记录了来自不同震源区的地震能量的叠加。这两种技术都给出了3月6日至7日挪威西南海岸约500公里处最强风暴生成区域范围的上限。通过使用海洋X-波段雷达测量的二维波高谱，我们估计，在几个风暴期间，挪威西南部海岸外的生成区域的扩展的相对变化小于3倍。这表明生成区域的大小由海岸线或水深等静态特征控制，而不是由风暴的范围控制。微震能量似乎主要是由波高控制在不同的和可识别的生成区域，因此，在这些地区的波气候可以研究使用历史记录的微震。
[1] Microseism recordings from four European broadband stations and from three seismic arrays in Scotland, Norway, and Germany are compared with model wave data of the oceanic wave field in the North Atlantic and local ocean wave data from the Norwegian coast at 60 degrees N, both measured during February - March 2000. Two approaches have been tested to locate generation areas of microseismic energy: a new amplitude correlation technique and beam backprojection from the three seismic arrays. Both techniques reveal that the main generation areas are located in specific regions off the coast of Southwest Norway and North Scotland. Seismic stations distant from these generation areas record a superposition of seismic energy from different source regions. Those close to a specific source region also show a high correlation with it. Both techniques give upper limits for the extent of the generation area of the strongest storm on 6/7 March at the southwest Norwegian coast of about 500 km. By using marine X-band radar measurements of the two-dimensional wave height spectrum, we estimate that the relative change of the extension of the generation area off the coast of southwest Norway during several storms is less than a factor of 3. This indicates that the size of the generation area is controlled by static features as coastline or bathymetry, and not by the extent of the storms. Microseism energy appears to be mainly controlled by the wave height in distinct and identifiable generation regions, so that the wave climate in these regions can be studied using historical records of microseisms.