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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS002 Poster presentation 1844 Distribution of asperities of the 1854 Ansei Nankai earthquake Dr. Yuichi Namegaya Geological Survey of Japan National Institute of Advanced Industrial Science IASPEI Yoshinobu Tsuji Are the locations of the asperities of each gigantic earthquake belonging to the series of the Nankai earthquakes located commonly at the same places In order to clarify this, the locations of asperities of two Nankai earthquakes, the 1854 Ansei Nankai earthquake and the 1946 Showa Nankai earthquake should be estimated and compared to each other. Distribution of asperities of the 1946 Showa Nankai earthquake is estimated by Tanioka and Satake (2001) by using inversion method on the tide gauge records of the tsunami wave. They pointed out that there are three asperities; the south off Susaki city, Kochi prefecture; the east off the cape Muroto; and sea area south off Kii peninsula. However, the distribution of asperities of the 1854 Ansei Nankai earthquake has not been estimated, because there are no data of the tide gauge records of the tsunami. Only the distributions of the tsunami maximum heights, the crustal deformations, and the seismic intensities estimated from the old documents are available for the 1854 Ansei Nankai earthquake. In this study, we developed the nonlinear inversion method to solve the distribution of asperities by using the data of the tsunami maximum heights and the crustal deformations. We estimated the distribution of asperities to make the sums of square of differences of the maximum tsunami heights between the recorded and calculated minimum. As the result, the distribution of asperities of the 1854 Ansei Nankai earthquake is similar to that of the 1946 Showa Nankai earhtuake, but the amount of dislocations of the former is larger than that of the latter. Keywords: 1854 ansei nankai earthquake, asperity, joint inversion
IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS003 1845 - 1892 Symposium Early-Warning Systems Convener : Prof. Jochen Zschau Early warning systems can reduce the negative impacts across the globe of extreme events such as earthquakes, tsunamis, volcano eruptions, landslides, tropical storms, floods, extreme space weather and others. They provide timely information that allows individuals exposed to a hazard, to take action to avoid or reduce their risk and prepare for effective response. Dependent on the type of hazard the warning time available may range between only a few seconds in case of earthquakes to months and years in case of creeping disasters such as droughts. Although rapid information- and early warning technologies are now available to a great extent, their potential in the field of disaster mitigation is not used to any appreciable extent, showing that the user needs are not yet addressed sufficiently. Integrated earth observation, the development of real-time analysis, modelling and simulation methods, their integration with appropriate facilities for data processing, visualization and rapid information systems and their application to early warning in conjunction with disaster management, therefore, remains one of the major challenges of applied earth system sciences. The session will discuss the latest scientific/technological developments, projects, programs and best practices in the field of early warning. This will be done for various disaster types, from global to local scale and with special regard to the user needs. Contributions are particularly welcome if they address the aspect of multi-hazard early warning.
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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy<br />
(S) - <strong>IASPEI</strong> - International Association of Seismology and Physics of the Earth's<br />
Interior<br />
JSS002 Poster presentation 1844<br />
Distribution of asperities of the 1854 Ansei Nankai earthquake<br />
Dr. Yuichi Namegaya<br />
Geological Survey of Japan National Institute of Advanced Industrial Science <strong>IASPEI</strong><br />
Yoshinobu Tsuji<br />
Are the locations of the asperities of each gigantic earthquake belonging to the series of the Nankai<br />
earthquakes located commonly at the same places In order to clarify this, the locations of asperities of<br />
two Nankai earthquakes, the 1854 Ansei Nankai earthquake and the 1946 Showa Nankai earthquake<br />
should be estimated and compared to each other. Distribution of asperities of the 1946 Showa Nankai<br />
earthquake is estimated by Tanioka and Satake (2001) by using inversion method on the tide gauge<br />
records of the tsunami wave. They pointed out that there are three asperities; the south off Susaki city,<br />
Kochi prefecture; the east off the cape Muroto; and sea area south off Kii peninsula. However, the<br />
distribution of asperities of the 1854 Ansei Nankai earthquake has not been estimated, because there<br />
are no data of the tide gauge records of the tsunami. Only the distributions of the tsunami maximum<br />
heights, the crustal deformations, and the seismic intensities estimated from the old documents are<br />
available for the 1854 Ansei Nankai earthquake. In this study, we developed the nonlinear inversion<br />
method to solve the distribution of asperities by using the data of the tsunami maximum heights and<br />
the crustal deformations. We estimated the distribution of asperities to make the sums of square of<br />
differences of the maximum tsunami heights between the recorded and calculated minimum. As the<br />
result, the distribution of asperities of the 1854 Ansei Nankai earthquake is similar to that of the 1946<br />
Showa Nankai earhtuake, but the amount of dislocations of the former is larger than that of the latter.<br />
Keywords: 1854 ansei nankai earthquake, asperity, joint inversion
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