W Phase Inversion and Tsunami Inundation Modeling for Tsunami Early Warning: Case Study for the 2011 Tohoku Event
W Phase Inversion and Tsunami Inundation Modeling for Tsunami Early Warning: Case Study for the 2011 Tohoku Event
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DOI：
10.1007/s00024-013-0680-z
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发表时间：
2014-07-01
影响因子：
2
通讯作者：
Tanioka, Yuichiro
中科院分区：
文献类型：
--
作者：
Gusman, Aditya Riadi;Tanioka, Yuichiro
2011 年东北地震的质心矩张量解是使用日本全范围地震仪网络 (F-net) 记录的 5 分钟和 10 分钟数据通过 W 相位反演确定的。通过力矩震级与破裂面积的比例关系以及假设刚度为 4 x 10(10) N m(-2)，可以从解中估计出简单的矩形地震断层模型。使用估计的断层模型模拟了仙台平原、南三陆、陆前高田和太郎的海啸淹没。然后将模拟的海啸淹没面积和高度与观测结果进行比较。即使仅使用 5 分钟数据的 W 相解模拟的海啸高度和洪水也与观测结果相当相似。使用 10 分钟的 W 相数据时，结果有所改善。这些表明W相解可可靠地用于海啸淹没建模。此外，结合W相位反演和海啸淹没建模的技术可以产生足够准确的海啸预警结果。
Centroid moment tensor solutions for the 2011 Tohoku earthquake are determined by W phase inversions using 5 and 10 min data recorded by the Full Range Seismograph Network of Japan (F-net). By a scaling relation of moment magnitude to rupture area and an assumption of rigidity of 4 x 10(10) N m(-2), simple rectangular earthquake fault models are estimated from the solutions. Tsunami inundations in the Sendai Plain, Minamisanriku, Rikuzentakata, and Taro are simulated using the estimated fault models. Then the simulated tsunami inundation area and heights are compared with the observations. Even the simulated tsunami heights and inundations from the W phase solution that used only 5 min data are considerably similar to the observations. The results are improved when using 10 min of W phase data. These show that the W phase solutions are reliable to be used for tsunami inundation modeling. Furthermore, the technique that combines W phase inversion and tsunami inundation modeling can produce results that have sufficient accuracy for tsunami early warning purposes.