Abstract
The tsunami-zoning map (possible tsunami heights of a frequency of 1 event within 50 and 100 years) for the coast of the South Kuril Islands have been updated (former map have been developed in 2006). The update is based on the development of the tsunami-activity model, mainly due to the increase of the number of basic coastal locations (from 18 to 62) for which the parameters of the recurrence function were estimated, as well as on the modernization of the numerical model. Serious progress in simulations was achieved in setting the initial conditions, using the seismic tsunami source model. Field surveys on the coast to search for traces of historical and paleotsunami, as well as qualitative documentation of the Tohoku tsunami manifestations allowed to clarify the model of tsunami-activity in Southern Kuril Islands. The sufficiently large amount of data in this case (which is generally untypical for the tsunami) allowed authors, to apply the statistical approach for evaluation of the tsunami hazard distribution along the coast. Estimates of tsunami heights were spread from the basic coastal locations to adjacent parts of the coast using detailed simulation of all significant tsunamis and calculating wave heights at the shoreline. The detailed maps of tsunami-hazard at scale 1:100,000 have been made for the settlements of Yuzhno-Kurilsk, Kurilsk, Malokurilskoe, and Krabozavodskoe.
Highlights
Tsunami is one of the most formidable natural phenomena of nature, which causes great damage to economic objects of coastal settlements of the Far Eastern region of Russia, and sometimes to human casualties
The tsunami hazard assessment technique is based on estimation of regional tsunamirecurrence function [1]: n h φ(x, h) = T = f(x)Φ (x, H ∗)
We didn’t separate insignificant and perceptible tsunamis, as from the practical point of view it does not make sense, so on map we provided joined range of tsunami height less than 1 m
Summary
Tsunami is one of the most formidable natural phenomena of nature, which causes great damage to economic objects of coastal settlements of the Far Eastern region of Russia, and sometimes to human casualties. The Kuril Islands as well as Kamchatka peninsula, are located near to one of the most seismically active regions in the world, which is confined to the western slope of the Kuril trench It is here, where the epicenters of tsunamigenic (tsunami-inducing) earthquakes are located, the corresponding map is shown in fig 1. The map actualization was carried out due to information on tsunami manifestations in the past 11 years (several events were recorded, of which the Tohoku Tsunami on 11.03.2011 was a danger for settlements of the southern Kuril Islands), the determination of the heights of some historical tsunamis during field surveys along the coast, and the development of methods for numerical simulation
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