Optimum Sea Surface Displacement and Fault Slip Distribution of the 2017 Tehuantepec Earthquake (Mw 8.2) in Mexico Estimated From Tsunami Waveforms
Optimum Sea Surface Displacement and Fault Slip Distribution of the 2017 Tehuantepec Earthquake (Mw 8.2) in Mexico Estimated From Tsunami Waveforms
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DOI：
10.1002/2017gl076070
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发表时间：
2017-12
影响因子：
5.2
通讯作者：
A. Gusman;I. Mulia;K. Satake
中科院分区：
文献类型：
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作者：
A. Gusman;I. Mulia;K. Satake
2017年特万特佩克地震（Mw 8.2）是有史以来第一次在中美洲海沟发生的大型正断层事件。地震在墨西哥恰帕斯港产生了振幅为1.8米（高度= 3.5米）的海啸。在海岸验潮站和海上浮标站记录的海啸波形被用来估计最佳的海面位移，而不假设任何故障。最优海面位移模型表明，最大隆起0.5m位于海沟附近，最大沉降0.8m位于震中附近的海岸一侧。然后，我们估计的断层滑动分布，可以最好地解释最佳的海面位移假设10个不同的断层几何形状。最好的模型表明，一个紧凑的大滑移区（3-6米）从30公里的深度延伸到90公里，在60公里的深度为中心。
The 2017 Tehuantepec earthquake (Mw 8.2) was the first great normal fault event ever instrumentally recorded to occur in the Middle America Trench. The earthquake generated a tsunami with an amplitude of 1.8 m (height = 3.5 m) in Puerto Chiapas, Mexico. Tsunami waveforms recorded at coastal tide gauges and offshore buoy stations were used to estimate the optimum sea surface displacement without assuming any fault. Our optimum sea surface displacement model indicated that the maximum uplift of 0.5 m is located near the trench and the maximum subsidence of 0.8 m on the coastal side near the epicenter. We then estimated the fault slip distribution that can best explain the optimum sea surface displacement assuming 10 different fault geometries. The best model suggests that a compact region of large slip (3–6 m) extends from a depth of 30 km to 90 km, centered at a depth of 60 km.