The Chiapas tsunami of 9 September 2017 on the Mexican coast: Spectral properties and energy parameterization
Abstract
A major (Mw = 8.2) interplate normal-fault earthquake occurred in the Gulf of Tehuantepec (Chiapas, Mexico) on 8 September 2017. The earthquake generated a tsunami that strongly affected the nearby coast of Mexico, where it was recorded by 12 high-resolution tide gauges. The tsunami was also recorded by three open-ocean DART stations offshore of Mexico. Based on joint spectral analyses of the tsunami and background noise, we have estimated the "true" tsunami spectra for both the deep ocean and the coast. We have also determined major spectral parameters of the tsunami waves, including: (1) the integral open-ocean tsunami energy; (2) the relative mean amplification of tsunami waves; and (3) the "tsunami colour", i.e. the frequency content of offshore tsunami waves. The same parameters were also estimated using numerical simulations of the event. The spectral estimates of the near-field 2017 Chiapas tsunami were further compared with those of the far-field 2010 Chile and 2011 Tohoku tsunamis.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMNH41C1009R
- Keywords:
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- 4315 Monitoring;
- forecasting;
- prediction;
- NATURAL HAZARDSDE: 4333 Disaster risk analysis and assessment;
- NATURAL HAZARDSDE: 4341 Early warning systems;
- NATURAL HAZARDSDE: 4564 Tsunamis and storm surges;
- OCEANOGRAPHY: PHYSICAL