Rupture processes of the 2016 Kumamoto earthquake sequence: Causes for extreme ground motions

2017 ◽  
Vol 44 (12) ◽  
pp. 6002-6010 ◽  
Author(s):  
Hiroaki Kobayashi ◽  
Kazuki Koketsu ◽  
Hiroe Miyake
Keyword(s):  
Ground Motions ◽  
Earthquake Sequence ◽  
2016 Kumamoto Earthquake ◽  
Kumamoto Earthquake ◽  
The 2016 Kumamoto Earthquake

scholarly journals Geotechnical and infrastructural damage due to the 2016 Kumamoto earthquake sequence

2018 ◽  
Vol 104 ◽  
pp. 390-394 ◽  
Author(s):  
S. Bhattacharya ◽  
M. Hyodo ◽  
G. Nikitas ◽  
B. Ismael ◽  
H. Suzuki ◽  
...  
Keyword(s):  
Earthquake Sequence ◽  
2016 Kumamoto Earthquake ◽  
Kumamoto Earthquake ◽  
The 2016 Kumamoto Earthquake

scholarly journals Strong motions observed by K-NET and KiK-net during the 2016 Kumamoto earthquake sequence

2017 ◽  
Vol 69 (1) ◽  
Author(s):  
Wataru Suzuki ◽  
Shin Aoi ◽  
Takashi Kunugi ◽  
Hisahiko Kubo ◽  
Nobuyuki Morikawa ◽  
...  
Keyword(s):  
Earthquake Sequence ◽  
2016 Kumamoto Earthquake ◽  
Kumamoto Earthquake ◽  
The 2016 Kumamoto Earthquake

scholarly journals Electrical conductive fluid-rich zones and their influence on the earthquake initiation, growth, and arrest processes: Observations from the 2016 Kumamoto earthquake sequence, Kyushu Island, Japan

2020 ◽  
Author(s):  
Koki Aizawa ◽  
Shinichi Takakura ◽  
Hisafumi Asaue ◽  
Katsuaki Koike ◽  
Ryokei Yoshimura ◽  
...  
Keyword(s):  
Broad Band ◽  
Quantitative Relationship ◽  
Outer Edge ◽  
Earthquake Sequence ◽  
2016 Kumamoto Earthquake ◽  
Magnetotelluric Data ◽  
Kumamoto Earthquake ◽  
Crustal Earthquakes ◽  
The 2016 Kumamoto Earthquake ◽  
Earthquake Ruptures

Abstract Crustal earthquake ruptures tend to initiate near fluid-rich zones. However, it is relatively unknown whether fluid-rich zones can further promote or arrest these ruptures. We image the electrical resistivity structure around the focal area of the 2016 Kumamoto earthquake sequence by using 200 sites broad-band magnetotelluric data, and discuss its quantitative relationship to earthquake initiation, growth, and arrest processes. The ruptures that initiated along the outer edge of the low-resistivity fluid-rich zones (<30 Ωm) tended to become large earthquakes, whereas those that initiated either distal to or within the fluid-rich zones did not. The ruptures were arrested by high-temperature (>400°C) fluid-rich zones, whereas shallower low-temperature (200–400°C) fluid-rich zones either promoted or arrested the ruptures. These results suggest that the distribution of mid-crustal fluids contributes to the initiation, growth, and arrest of crustal earthquakes. The pre-failure pressure/temperature gradient (spatial difference) of the pore fluids may contribute to the rupture initiation, propagation, and arrest.

scholarly journals Characteristics of the surface ruptures associated with the 2016 Kumamoto earthquake sequence, central Kyushu, Japan

2016 ◽  
Vol 68 (1) ◽  
Author(s):  
Yoshiki Shirahama ◽  
Masayuki Yoshimi ◽  
Yasuo Awata ◽  
Tadashi Maruyama ◽  
Takashi Azuma ◽  
...  
Keyword(s):  
Earthquake Sequence ◽  
2016 Kumamoto Earthquake ◽  
Kumamoto Earthquake ◽  
The 2016 Kumamoto Earthquake ◽  
Surface Ruptures

scholarly journals Small-displacement linear surface ruptures of the 2016 Kumamoto earthquake sequence detected by ALOS-2 SAR interferometry

2016 ◽  
Vol 68 (1) ◽  
Author(s):  
Satoshi Fujiwara ◽  
Hiroshi Yarai ◽  
Tomokazu Kobayashi ◽  
Yu Morishita ◽  
Takayuki Nakano ◽  
...  
Keyword(s):  
Sar Interferometry ◽  
Earthquake Sequence ◽  
Small Displacement ◽  
2016 Kumamoto Earthquake ◽  
Kumamoto Earthquake ◽  
The 2016 Kumamoto Earthquake ◽  
Surface Ruptures

scholarly journals Simulation of building damage distribution in downtown Mashiki, Kumamoto, Japan caused by the 2016 Kumamoto earthquake based on site-specific ground motions and nonlinear structural analyses

2021 ◽  
Author(s):  
Jikai Sun ◽  
Fumiaki Nagashima ◽  
Hiroshi Kawase ◽  
Shinichi Matsushima ◽  
Baoyintu
Keyword(s):  
Ground Motions ◽  
Target Area ◽  
2016 Kumamoto Earthquake ◽  
Ground Acceleration ◽  
Site Specific ◽  
Construction Period ◽  
Kumamoto Earthquake ◽  
Velocity Models ◽  
The 2016 Kumamoto Earthquake ◽  
Wooden Structures

AbstractMost of the buildings damaged by the mainshock of the 2016 Kumamoto earthquake were concentrated in downtown Mashiki in Kumamoto Prefecture, Japan. We obtained 1D subsurface velocity structures at 535 grid points covering this area based on 57 identified velocity models, used the linear and equivalent linear analyses to obtain site-specific ground motions, and generated detailed distribution maps of the peak ground acceleration and velocity in Mashiki. We determined the construction period of every individual building in the target area corresponding to updates to the Japanese building codes. Finally, we estimated the damage probability by the nonlinear response model of wooden structures with different ages. The distribution map of the estimated damage probabilities was similar to the map of the damage ratios from a field survey, and moderate damage was estimated in the northwest where no damage survey was conducted. We found that both the detailed site amplification and the construction period of wooden houses are important factors for evaluating the seismic risk of wooden structures.

scholarly journals Electrical Conductive Fluidized Zones and Their Influence on the Earthquake Nucleation, Growth, and Arrest Processes of the 2016 Kumamoto Earthquake Sequence, Kyushu Island, Japan

2020 ◽  
Author(s):  
Koki Aizawa ◽  
Shinichi Takakura ◽  
Hisafumi Asaue ◽  
Katsuaki Koike ◽  
Ryokei Yoshimura ◽  
...  
Keyword(s):  
Broad Band ◽  
Quantitative Relationship ◽  
Earthquake Sequence ◽  
2016 Kumamoto Earthquake ◽  
Magnetotelluric Data ◽  
Low Resistivity ◽  
Kumamoto Earthquake ◽  
The 2016 Kumamoto Earthquake ◽  
Earthquake Nucleation ◽  
Nucleation Growth

Abstract Crustal earthquake ruptures tend to nucleate near fluidized zones. However, it is relatively unknown whether fluidized zones can further promote or arrest these ruptures. We image the electrical resistivity structure around the focal area of the 2016 Kumamoto earthquake sequence by using 200 sites broad-band magnetotelluric data, and discuss its quantitative relationship to earthquake nucleation, growth, and arrest processes. The result shows that the earthquake hypocenters are all located within 10 km from low-resistivity fluidized zones < 30Ωm. The ruptures that nucleated along the outer edge of the low-resistivity fluidized zones tended to become large earthquakes, whereas those that initiated either distal to or within the fluidized zones did not. The ruptures were arrested by high-temperature (>400°C) fluidized zones, whereas shallower low-temperature (200°C–400°C) fluidized zones either promoted or arrested the ruptures. These results suggest that the distribution of mid-crustal fluids contributes to the nucleation, growth, and arrest of crustal earthquakes.

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