Deep-Water Characteristics of the Trans-Pacific Tsunami from the 1 April 2014 M (w) 8.2 Iquique, Chile Earthquake

作者：Heidarzadeh Mohammad^*; Satake Kenji; Murotani Satoko; Gusman Aditya Riadi; Watada Shingo

来源：Pure and Applied Geophysics, 2015, 172(3-4): 719-730.

DOI：10.1007/s00024-014-0983-8

• Pacific Ocean
• tsunami
• Iquique earthquake of 1 April 2014
• chilean tsunami
• DART buoy
• deep-water waves
• fourier analysis
• wavelet analysis
• numerical modeling

We studied the tsunami generated by the 1 April 2014 M (w) 8.2 Iquique (Chile) earthquake using 20 Deep-ocean Assessment and Reporting of Tsunamis (DART) records and applying Fourier and wavelet analyses as well as performing numerical simulations. Deep-water tsunami wave heights were in the range of 0.8-35.0 cm. For the stations located more than 2,200 km from the source, the average wave height was 1.7 +/- A 1.1 cm. The observed tsunami arrivals were delayed by 1-17 min relative to the simulated ones based on the linear long wave equations, and the delays were proportional to the tsunami travel distances. A small initial depression was observed at DART stations located at distances > 10,000 km from the source whereas, traditionally, an initial elevation is expected at stations located seaward of subduction zones. Fourier analyses showed tsunami governing periods of 21.1 +/- A 1.7 and 14.7 +/- A 0.7 min, corresponding to a fault length of 60-70 km and a fault width of 40-45 km. While the two 21-min and 15-min signals appeared in most DART stations during similar to 0.5 h following the conventional arrival times, the 15-min signal was delayed at some far-field stations. Distribution of maximum DART wave heights across the Pacific Ocean did not show a meaningful relation between maximum DART wave heights and directivity or distance from the source.

• 出版日期2015-3