Strong ground motions from the 2011 off the Pacific coast of Tohoku
Earthquake, the most powerful earthquake to have occurred in and
around Japan after the installation of a modern seismic network,
were recorded for more than 300 seconds by a dense and wide-span
seismic network, the Metropolitan Seismic Observation Network (MeSO-net),
installed around the Tokyo metropolitan area about 200 km away from
the epicenter. We investigate the rupture process of the earthquake
in space and time by performing semblance-enhanced stacking analysis
of the waveforms in a frequency range of 0.05 to 0.5 Hz. By projecting
the power of the stacked waveforms to an assumed fault plane, the
rupture propagation image of the large and complex earthquake has
been successfully obtained. The seismic energy was mainly generated
from the off-shore areas of about 100 km away from the coast in Miyagi
and Fukushima Prefectures. The shallow and eastern part of the fault
along the Japan trench off Miyagi Prefecture released strong seismic
energy which might have been related to the excitation of gigantic
tsunami. In contrast, the southern shallow part of the fault plane,
off Ibaraki Prefecture, released only minor seismic energy. Our analysis
suggests that the focal areas combining both the officially-forecasted
Miyagi-oki earthquake and those of historical earthquakes that occurred
off the coast of Fukushima Prefecture in 1938 were broken, resulting
in the 2011 great M 9 earthquake.
%0 Journal Article
%1 honda_etal:2011
%A Honda, Ryou
%A Yukutake, Yohei
%A Ito, Hiroshi
%A Harada, Masatake
%A Aketagawa, Tamotsu
%A Yoshida, Akio
%A Sakai, Shin'ichi
%A Nakagawa, Shigeki
%A Hirata, Naoshi
%A Obara, Kazushige
%A Kimura, Hisanori
%D 2011
%J Earth, Planets and Space
%K geophysics seismology
%N 7
%P 583--588
%R 10.5047/eps.2011.05.034
%T A complex rupture image of the 2011 off the Pacific coast of Tohoku
earthquake revealed by the MeSO-net
%U http://dx.doi.org/10.5047/eps.2011.05.034
%V 63
%X Strong ground motions from the 2011 off the Pacific coast of Tohoku
Earthquake, the most powerful earthquake to have occurred in and
around Japan after the installation of a modern seismic network,
were recorded for more than 300 seconds by a dense and wide-span
seismic network, the Metropolitan Seismic Observation Network (MeSO-net),
installed around the Tokyo metropolitan area about 200 km away from
the epicenter. We investigate the rupture process of the earthquake
in space and time by performing semblance-enhanced stacking analysis
of the waveforms in a frequency range of 0.05 to 0.5 Hz. By projecting
the power of the stacked waveforms to an assumed fault plane, the
rupture propagation image of the large and complex earthquake has
been successfully obtained. The seismic energy was mainly generated
from the off-shore areas of about 100 km away from the coast in Miyagi
and Fukushima Prefectures. The shallow and eastern part of the fault
along the Japan trench off Miyagi Prefecture released strong seismic
energy which might have been related to the excitation of gigantic
tsunami. In contrast, the southern shallow part of the fault plane,
off Ibaraki Prefecture, released only minor seismic energy. Our analysis
suggests that the focal areas combining both the officially-forecasted
Miyagi-oki earthquake and those of historical earthquakes that occurred
off the coast of Fukushima Prefecture in 1938 were broken, resulting
in the 2011 great M 9 earthquake.
@article{honda_etal:2011,
abstract = {Strong ground motions from the 2011 off the Pacific coast of Tohoku
Earthquake, the most powerful earthquake to have occurred in and
around Japan after the installation of a modern seismic network,
were recorded for more than 300 seconds by a dense and wide-span
seismic network, the Metropolitan Seismic Observation Network (MeSO-net),
installed around the Tokyo metropolitan area about 200 km away from
the epicenter. We investigate the rupture process of the earthquake
in space and time by performing semblance-enhanced stacking analysis
of the waveforms in a frequency range of 0.05 to 0.5 Hz. By projecting
the power of the stacked waveforms to an assumed fault plane, the
rupture propagation image of the large and complex earthquake has
been successfully obtained. The seismic energy was mainly generated
from the off-shore areas of about 100 km away from the coast in Miyagi
and Fukushima Prefectures. The shallow and eastern part of the fault
along the Japan trench off Miyagi Prefecture released strong seismic
energy which might have been related to the excitation of gigantic
tsunami. In contrast, the southern shallow part of the fault plane,
off Ibaraki Prefecture, released only minor seismic energy. Our analysis
suggests that the focal areas combining both the officially-forecasted
Miyagi-oki earthquake and those of historical earthquakes that occurred
off the coast of Fukushima Prefecture in 1938 were broken, resulting
in the 2011 great M 9 earthquake.},
added-at = {2012-09-01T13:08:21.000+0200},
author = {Honda, Ryou and Yukutake, Yohei and Ito, Hiroshi and Harada, Masatake and Aketagawa, Tamotsu and Yoshida, Akio and Sakai, Shin'ichi and Nakagawa, Shigeki and Hirata, Naoshi and Obara, Kazushige and Kimura, Hisanori},
biburl = {https://www.bibsonomy.org/bibtex/2125ab3523daddc1389b354a2e5f30f8e/nilsma},
day = 27,
doi = {10.5047/eps.2011.05.034},
interhash = {879c38b5ad35e265597f555772179587},
intrahash = {125ab3523daddc1389b354a2e5f30f8e},
issn = {13438832},
journal = {Earth, Planets and Space},
keywords = {geophysics seismology},
month = sep,
number = 7,
pages = {583--588},
timestamp = {2021-02-09T13:26:37.000+0100},
title = {A complex rupture image of the 2011 off the Pacific coast of Tohoku
earthquake revealed by the MeSO-net},
url = {http://dx.doi.org/10.5047/eps.2011.05.034},
volume = 63,
year = 2011
}