2024-03-19T03:06:35Z
https://repository.dl.itc.u-tokyo.ac.jp/oai
oai:repository.dl.itc.u-tokyo.ac.jp:00032474
2022-12-19T04:08:29Z
80:4535:4587:4588
9:504:4538:4589:4590
Characterization of the 2007 Noto Hanto Earthquake, Central Japan: Insights from Seismic Profiling, Aftershock Observations, and Co-seismic Crustal Deformation
反射法地震探査・余震観測・地殻変動から見た2007年能登半島地震の特徴について
佐藤, 比呂志
124045
岩崎, 貴哉
124046
金沢, 敏彦
124047
宮崎, 真一
124048
加藤, 直子
124049
酒井, 慎一
124050
山田, 知朗
124051
宮内, 崇裕
124052
伊藤, 谷生
124053
平田, 直
124054
51.1
2007 Noto Hanto earthquake
source fault
crustal deformation
geologic structure
central Japan
application/pdf
The geophysical and geological characters of the source fault of the Noto Hanto earthquake (MJMA 6.9) were synthesized. Based on the seismic profiles acquired by two-ship seismic reflection profiling and aftershock distribution determined by densely deployed seismic stations, we constructed the 3D geometry of the source fault, trending ENE to NE and dipping 60 degrees south. Around the focal area, detailed topography and bathymetry had been measured by laser scanning and echo sounding before the earthquake. Unique data on onshore-offshore co-seismic crustal movements were obtained from careful comparisons with new data acquired after the earthquake. Using the 3D geometry of the source fault and the co-seismic crustal movements, slip distribution on the fault surface was estimated by 3D dislocation inversion. The obtained pattern of slip distribution shows that the largest slip area is on a relatively shallow part of the fault surface, which coincides with the location of a known active fault. The seismic reflection profiles and surface geo-logy suggest that the source fault was formed as a normal fault during the stage of backarc rifting in Oligocene to early Miocene. The 2007 Noto Hanto earthquake was generated by an oblique slip on the Miocene normal fault. The landward extension of the source fault, which bounds the Miocene half-graben, is traceable by seismic reflection profiling and gravity anomaly. The eastern end of the source fault is bounded by a syn-rift transfer fault, suggesting strong control of the crustal structure on the behavior of the earthquake source fault.
departmental bulletin paper
地震研究所
2007
application/pdf
地震研究所彙報
4
82
369
379
AN00162258
00408972
https://repository.dl.itc.u-tokyo.ac.jp/record/32474/files/IHO82412.pdf
jpn