Zobrazeno 1 - 10
of 80
pro vyhledávání: '"Koshun Yamaoka"'
Publikováno v:
Earth, Planets and Space, Vol 74, Iss 1, Pp 1-19 (2022)
Abstract We developed a method to detect attenuation changes during seismic wave propagation excited by precisely controlled artificial seismic sources, namely Accurately Controlled Routinely Operated Signal System (ACROSS), and applied it to monitor
Externí odkaz:
https://doaj.org/article/d4f683da671b49cfb30661de3abbfe97
Autor:
Takeshi Tsuji, Tatsunori Ikeda, Ryosuke Matsuura, Kota Mukumoto, Fernando Lawrens Hutapea, Tsunehisa Kimura, Koshun Yamaoka, Masanao Shinohara
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
Abstract We have developed a new continuous monitoring system based on small seismic sources and distributed acoustic sensing (DAS). The source system generates continuous waveforms with a wide frequency range. Because the signal timing is accurately
Externí odkaz:
https://doaj.org/article/9d162e4b63794b1a9d6688edc7c67344
Publikováno v:
Earth, Planets and Space, Vol 73, Iss 1, Pp 1-12 (2021)
Abstract We analyze temporal variations in the travel times of both P and S waves (Vp and Vs) for 14 months at Toyohashi (central Japan) with a continuously operating vibration source that could efficiently produce both P and S waves. Seismic waves p
Externí odkaz:
https://doaj.org/article/2759fedbd5bc4593b122f07d8ecb75df
Autor:
Hiroshi Ichihara, Junna Kanehiro, Toru Mogi, Koshun Yamaoka, Noriko Tada, Edward Alan Bertrand, Mamoru Adachi
Publikováno v:
Earth, Planets and Space, Vol 70, Iss 1, Pp 1-10 (2018)
Abstract Seismic swarm areas below the southeast flank of Ontake volcano, central Japan, provide an important opportunity to study interactions between seismicity, volcanic processes and crustal fluid. On June 25, 2017, an M5.6 earthquake occurred in
Externí odkaz:
https://doaj.org/article/f347b335256748e49148eb44299a0a42
Autor:
Shuhei Tsuji, Koshun Yamaoka, Ryoya Ikuta, Takahiro Kunitomo, Toshiki Watanabe, Yasuhiro Yoshida, Akio Katsumata
Publikováno v:
Earth, Planets and Space, Vol 70, Iss 1, Pp 1-10 (2018)
Abstract We discovered a secular change in the travel time of direct S-waves over a 10-year observation period by means of continuous operation of an artificial and stable seismic source, called Accurately Controlled Routinely Operated Signal System
Externí odkaz:
https://doaj.org/article/c7b7c3ca814d4f3b988876f794fe435c
Publikováno v:
Scientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
Abstract Fluids are thought to play an important role in controlling episodic tremor and slow slip (ETS) in subduction zones. Therefore, constraining the along-dip distribution of fluids is necessary to better understand source mechanism of ETS, and
Externí odkaz:
https://doaj.org/article/ab81dca3969a4dfbb8293af271068cf5
Autor:
Koshun Yamaoka, Gennady Sobolev, Warner Marzocchi, Gerassimos Papadopoulos, Ian Main, Raul Madariaga, Paolo Gasparini, Yun-Tai Chen, Thomas H. Jordan, Jochen Zschau
Publikováno v:
Annals of Geophysics, Vol 55, Iss 1 (2012)
In his commentary on the International Commission on Earthquake Forecasting (ICEF) report [Jordan et al. 2011], Crampin [2012] claims that observable changes in shear-wave splitting can predict large earthquakes on short time scales with high reliabi
Externí odkaz:
https://doaj.org/article/c4f79b7b83774d249edb8d0ba327fd3a
Publikováno v:
International Journal of Geophysics, Vol 2012 (2012)
Externí odkaz:
https://doaj.org/article/0db5634264d94c69b5d4834bc4afcdd1
Publikováno v:
International Journal of Geophysics, Vol 2012 (2012)
Constructing a statistical model to characterize the physical conditions associated with large earthquake occurrence is crucial for disaster mitigation. With the aim to formulate such a model, we previously developed a statistical evaluation system w
Externí odkaz:
https://doaj.org/article/bf404a098c054aa682b330af3d26363b
Autor:
Koshun Yamaoka, Gerassimos Papadopoulos, Gennady Sobolev, Warner Marzocchi, Ian Main, Raul Madariaga, Paolo Gasparini, Yun-Tai Chen, Thomas H. Jordan, Jochen Zschau
Publikováno v:
Annals of Geophysics, Vol 54, Iss 4 (2011)
Following the 2009 L'Aquila earthquake, the Dipartimento della Protezione Civile Italiana (DPC), appointed an International Commission on Earthquake Forecasting for Civil Protection (ICEF) to report on the current state of knowledge of short-term pre
Externí odkaz:
https://doaj.org/article/ffcbed8b59aa4f93a285cfb82fafcb6d