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| Titel |
Computed inundation heights of the 2011 Tohoku tsunami compared to measured run-up data: hints for tsunami source inversion |
| VerfasserIn |
G. Pagnoni, S. Tinti, A. Armigliato |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250063722
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| Zusammenfassung |
| The 11 March 2011 earthquake that took place off the Pacific coast of Tohoku, North Honshu,
with Mw = 9.0, is the largest earthquake ever occurred in Japan, and generated a big
tsunami that spread across the Pacific Ocean, causing devastating effects in the
prefectures of Aomori, Iwate, Miyagi and Fukushima. It caused more than 15,000
casualties, swept away the low-land quarters of several villages and moreover was
the primary cause of the severe nuclear accident in the Fukushima Nuclear Power
Plant.
There is a very large set of observations covering both the earthquake and the tsunami,
and almost certainly this is the case with the most abundant dataset of high-quality data in the
history of seismology and of tsunami science. Local and global seismic networks,
continuous GPS networks, coastal tide gauges in Japan ports and across the Pacific, local
buoys cabled deep ocean-bottom pressure gauges (OBPG) and deep-ocean buoys
(such as DART) mainly along the foot of the margins of the pacific continents,
all contributed essential data to constrain the source of the earthquake and of the
tsunami.
In this paper we will use also the observed run-up data to put further constraints on the
source and to better determine the distribution of the slip on the offshore fault. This will be
done through trial-and-error forward modeling, that is by comparing inundation data
calculated by means of numerical tsunami simulations in the near field to tsunami run-up
heights measured during field surveys conducted by several teams and made available on the
net. Major attention will be devoted to reproduce observations in the prefectures that
were more affected and where run-up heights are very large (namely Iwate and
Miyagi). The simulations are performed by means of the finite-difference code
UBO-TSUFD, developed and maintained by the Tsunami Research Team of the
University of Bologna, Italy, that can solve both the linear and non-linear versions of the
shallow-water equations on nested grids and with dynamically moving shorelines. |
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