Under the new regulatory requirements for nuclear power plants in Japan, which were enacted in response to the nuclear accident associated with the Great East Japan Earthquake Tsunami that occurred on 11 March 2011, i...Under the new regulatory requirements for nuclear power plants in Japan, which were enacted in response to the nuclear accident associated with the Great East Japan Earthquake Tsunami that occurred on 11 March 2011, it is a requirement to establish a site-specific ＂standard tsunami＂ based on numerical analysis considering non-seismic factors in addition to general seismic faults. It is necessary to establish a consistent evaluation scheme for estimation of tsunami height induced by submarine landslide, since a standard framework for evaluation has not yet been established even though several models for calculation have been proposed and applied in practice. In this study, we estimated the scale of submarine landslide from a literature survey and showed examples of tsunami height evaluation using multiple schemes. As a result of evaluation of tsunami height using three schemes, the Watts model, the KLS model, and the modified-KLS model, the result obtained by the KLS model was comparatively large for every case.展开更多
In October 1790, a destructive earthquake occurred near Oran city in the western part of Algeria （MSK, Medvdev-Sponheuer-Kamik macroseismic intensity： X）. It generated a tsunami that inundated the Spanish and North...In October 1790, a destructive earthquake occurred near Oran city in the western part of Algeria （MSK, Medvdev-Sponheuer-Kamik macroseismic intensity： X）. It generated a tsunami that inundated the Spanish and North Africa coasts. The regional tectonic includes NW-SE compressional stress in Algeria and NE-SW strike-slip structures in the Alboran basin. In this work, we identified tsunami sources for the Alboran from numerical modeling. The sea bottom displacement is calculated from the Okada equations. The tsunami＇s propagation is simulated with the SWAN code. The identified tsunami source for the 1790 event is a 7.5 magnitude earthquake at the entrance of the Oran harbor, with a pure reverse faulting, probably associated with the Murdjajo fold The tsunami wave height profile that is obtained for the city of Oran showed an initial withdrawal of the sea that was followed by tsunami waves reaching 2 meters in height. The results obtained in Spain agree with the observations reported in the literature. Finally, the simulations led to a better understanding of the interdisciplinary approach to be considered as for tsunami sources in the Alboran. Sedimentary mass-movements should be now included as an additional component in the tsunami hazard assessment for the West Mediterranean. The contribution of sedimentary disturbance due to the series of canyons offshore the western margin could induce water waves higher than 2 meters in Western Algeria.展开更多
文摘Under the new regulatory requirements for nuclear power plants in Japan, which were enacted in response to the nuclear accident associated with the Great East Japan Earthquake Tsunami that occurred on 11 March 2011, it is a requirement to establish a site-specific ＂standard tsunami＂ based on numerical analysis considering non-seismic factors in addition to general seismic faults. It is necessary to establish a consistent evaluation scheme for estimation of tsunami height induced by submarine landslide, since a standard framework for evaluation has not yet been established even though several models for calculation have been proposed and applied in practice. In this study, we estimated the scale of submarine landslide from a literature survey and showed examples of tsunami height evaluation using multiple schemes. As a result of evaluation of tsunami height using three schemes, the Watts model, the KLS model, and the modified-KLS model, the result obtained by the KLS model was comparatively large for every case.
文摘In October 1790, a destructive earthquake occurred near Oran city in the western part of Algeria （MSK, Medvdev-Sponheuer-Kamik macroseismic intensity： X）. It generated a tsunami that inundated the Spanish and North Africa coasts. The regional tectonic includes NW-SE compressional stress in Algeria and NE-SW strike-slip structures in the Alboran basin. In this work, we identified tsunami sources for the Alboran from numerical modeling. The sea bottom displacement is calculated from the Okada equations. The tsunami＇s propagation is simulated with the SWAN code. The identified tsunami source for the 1790 event is a 7.5 magnitude earthquake at the entrance of the Oran harbor, with a pure reverse faulting, probably associated with the Murdjajo fold The tsunami wave height profile that is obtained for the city of Oran showed an initial withdrawal of the sea that was followed by tsunami waves reaching 2 meters in height. The results obtained in Spain agree with the observations reported in the literature. Finally, the simulations led to a better understanding of the interdisciplinary approach to be considered as for tsunami sources in the Alboran. Sedimentary mass-movements should be now included as an additional component in the tsunami hazard assessment for the West Mediterranean. The contribution of sedimentary disturbance due to the series of canyons offshore the western margin could induce water waves higher than 2 meters in Western Algeria.
