TY - JOUR
T1 - Conjugate faulting and structural complexity on the young fault system associated with the 2000 Tottori earthquake
AU - Kato, Aitaro
AU - Sakai, Shin’ichi
AU - Matsumoto, Satoshi
AU - Iio, Yoshihisa
N1 - Funding Information:
We deeply appreciate all members including researchers, technicians, and students who participated in and contributed to the deployment of the hyperdense seismic network. We are grateful to the residents and local governments of the Tottori, Shimane, and Okayama Prefectures for their strong support and understanding of the hyperdense seismic observations. We used the JMA earthquake catalog and waveform data from seismic stations operated by the National Research Institute for Earth Science and Disaster Prevention. This work was supported by the Grant-in-Aid for Scientific Research on Innovative Areas (KAKENHI No. 26109004) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan. This study was also partially supported by JST CREST Grant Number JPMJCR1763.
Funding Information:
We deeply appreciate all members including researchers, technicians, and students who participated in and contributed to the deployment of the hyperdense seismic network. We are grateful to the residents and local governments of the Tottori, Shimane, and Okayama Prefectures for their strong support and understanding of the hyperdense seismic observations. We used the JMA earthquake catalog and waveform data from seismic stations operated by the National Research Institute for Earth Science and Disaster Prevention. This work was supported by the Grant-in-Aid for Scientific Research on Innovative Areas (KAKENHI No. 26109004) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan. This study was also partially supported by JST CREST Grant Number JPMJCR1763.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12
Y1 - 2021/12
N2 - Young faults display unique complexity associated with their evolution, but how this relates to earthquake occurrence is unclear. Unravelling the fine-scale complexity in these systems could lead to a greater understanding of ongoing strain localization in young fault zones. Here we present high-spatial-resolution images of seismic sources and structural properties along a young fault zone that hosted the Tottori earthquake (Mw 6.8) in southwest Japan in 2000, based on data from a hyperdense network of ~1,000 seismic stations. Our precise micro-earthquake catalog reveals conjugate faulting over multiple length scales. These conjugate faults are well developed in zones of low seismic velocity. A vertically dipping seismic cluster of about 200 m length occurs within a width of about 10 m. Earthquake migrations in this cluster have a speed of about 30 m per day, which suggests that fluid diffusion plays a role. We suggest that fine structural complexities influence the pattern of seismicity in a developing fault system.
AB - Young faults display unique complexity associated with their evolution, but how this relates to earthquake occurrence is unclear. Unravelling the fine-scale complexity in these systems could lead to a greater understanding of ongoing strain localization in young fault zones. Here we present high-spatial-resolution images of seismic sources and structural properties along a young fault zone that hosted the Tottori earthquake (Mw 6.8) in southwest Japan in 2000, based on data from a hyperdense network of ~1,000 seismic stations. Our precise micro-earthquake catalog reveals conjugate faulting over multiple length scales. These conjugate faults are well developed in zones of low seismic velocity. A vertically dipping seismic cluster of about 200 m length occurs within a width of about 10 m. Earthquake migrations in this cluster have a speed of about 30 m per day, which suggests that fluid diffusion plays a role. We suggest that fine structural complexities influence the pattern of seismicity in a developing fault system.
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U2 - 10.1038/s43247-020-00086-3
DO - 10.1038/s43247-020-00086-3
M3 - Article
AN - SCOPUS:85126537938
SN - 2662-4435
VL - 2
JO - Communications Earth and Environment
JF - Communications Earth and Environment
IS - 1
M1 - 13
ER -