Analysis of travel time delay for large tsunamis across the pacific and Indian Oceans

Tjipto Prastowo; Latifatul Cholifah; Madlazim

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Analysis of travel time delay for large tsunamis across the pacific and Indian Oceans

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Tjipto Prastowo, Latifatul Cholifah, Madlazim

2018 Science of Tsunami Hazards Vol. 37 Issue 4 Article Cited by 5 SDG 13

Abstract

Travel time delay for a tsunami has been an increasingly important issue in recent years. The delay in time is calculated from a difference in arrival times between simulated waveforms and waves recorded by DART and gauge stations. In this study, we estimate travel times for the 2011 Tohoku, the 2014 Iquique, the 2004 Aceh, and the 2010 Mentawai events. We compare estimated travel times with travel times from field records and find that the time delay is increasing with epicentral distance, following reduced speeds during propagation. From analyses of the delays, we conclude that speed reduction in the Pacific is 1-2% from the long-wave speed but twice larger or more in the Indian Ocean due to its complex bathymetry. For far-field propagation in the Pacific, the delays could be approximately 17 minutes whereas the same amount of delay was attained at a shorter distance in the Indian Ocean. © 2018, Tsunami Society. All rights reserved.

Affiliations

Physics Department, State University of Surabaya, Surabaya, 60231, Indonesia; Center for Earth Science Studies, State University of Surabaya, Surabaya, 60231, Indonesia

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