Publication Date:
2017-04-04
Description:
We studied the disastrous effects of the tsunami
triggered by the Mw 9.0 earthquake that occurred on 11 March
2011 offshore the Honshu island (Japan). The tsunami caused a
huge amount of casualties and severe damage along most of the
eastern coastline of the island. The dataset used is composed of
images from ASTER (visible and thermal) and ENVISAT SAR
sensors. The processing and the analysis of data from different
sources were performed in order to obtain the tsunami
inundation map of the Sendai coastal area, to analyze inland
factors driving the tsunami inundation, and to detect the
liquefaction effects in the Chiba bay area as well. The obtained
inundation line, with a maximum value of about 6 km, has been
jointly analyzed with DEM providing the run-up values, which
are generally below 21 m in the ca. 60-km-long study area of
Sendai. The analysis highlights that the coastal topography
influences the inundation process: high-relief zones record the
lowest inundation distances, while within the plain the waves
entered inland for at least 4 km. We did not observe significant
direct effects of the vegetation cover on the inland water
penetration along the whole investigated area, nor of the different
orientation of the coastline. Moreover, from SAR coherence and
intensity correlation a wide area of subsidence is mapped at
Chiba bay, which is reasonably related to strong ground shaking
and pervasive liquefaction.
Description:
Published
Description:
347-351
Description:
1.10. TTC - Telerilevamento
Description:
JCR Journal
Description:
restricted
Keywords:
2011 Japan tsunami
;
wave inundation
;
liquefaction
;
SAR, Optical and Thermal data
;
04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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