Near-source observations and modeling of the Kuril Islands tsunamis of 15 November 2006 and 13 January 2007
Open Access
- 2 January 2008
- journal article
- Published by Copernicus GmbH in Advances in Geosciences
- Vol. 14, 105-116
- https://doi.org/10.5194/adgeo-14-105-2008
Abstract
Two major earthquakes near the Central Kuril Islands (Mw=8.3 on 15 November 2006 and Mw=8.1 on 13 January 2007) generated trans-oceanic tsunamis recorded over the entire Pacific Ocean. The strongest oscillations, exceeding several meters, occurred near the source region of the Kuril Islands. Tide gauge records for both tsunamis have been thoroughly examined and numerical models of the events have been constructed. The models of the 2006 and 2007 events include two important advancements in the simulation of seismically generated tsunamis: (a) the use of the finite failure source models by Ji (2006, 2007) which provide more detailed information than conventional models on spatial displacements in the source areas and which avoid uncertainties in source extent; and (b) the use of the three-dimensional Laplace equation to reconstruct the initial tsunami sea surface elevation (avoiding the usual shallow-water approximation). The close agreement of our simulated results with the observed tsunami waveforms at the open-ocean DART stations support the validity of this approach. Observational and model findings reveal that energy fluxes of the tsunami waves from the source areas were mainly directed southeastward toward the Hawaiian Islands, with relatively little energy propagation into the Sea of Okhotsk. A marked feature of both tsunamis was their high-frequency content, with typical wave periods ranging from 2–3 to 15–20 min. Despite certain similarities, the two tsunamis were essentially different and had opposite polarity: the leading wave of the November 2006 trans-oceanic tsunami was positive, while that for the January 2007 trans-oceanic tsunami was negative. Numerical modeling of both tsunamis indicates that, due to differences in their seismic source properties, the 2006 tsunami was more wide-spread but less focused than the 2007 tsunami.Keywords
This publication has 15 references indexed in Scilit:
- Tsunami Sources of the November 2006 and January 2007 Great Kuril EarthquakesBulletin of the Seismological Society of America, 2008
- Kuril Islands tsunami of November 2006: 1. Impact at Crescent City by distant scatteringPublished by American Geophysical Union (AGU) ,2008
- Tsunami waveform analyses of the 2006 underthrust and 2007 outer-rise Kurile earthquakesAdvances in Geosciences, 2008
- The Global Reach of the 26 December 2004 Sumatra TsunamiScience, 2005
- Spectral analysis of tsunami waves: Separation of source and topography effectsJournal of Geophysical Research: Oceans, 1997
- Extreme inundation flows during the Hokkaido‐Nansei‐Oki TsunamiGeophysical Research Letters, 1997
- Immortality DeniedAnthropology and Humanism, 1992
- Seismic gaps and plate tectonics: Seismic potential for major boundariesPure and Applied Geophysics, 1979
- The directivity of energy radiation of the tsunami generated in the vicinity of a continental shelfJournal of Oceanography, 1972
- Time for PerspectiveThe Personnel and Guidance Journal, 1963