Naoyasu Iwata
Railway Technical Research Institute
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Publication
Featured researches published by Naoyasu Iwata.
Earth, Planets and Space | 2012
Shunta Noda; Shunroku Yamamoto; Shinji Sato; Naoyasu Iwata; Masahiro Korenaga; Kimitoshi Ashiya
We propose a new approach to improve the accuracy of the back-azimuth estimation in real-time by using a single station record. Compared with the conventional approach in which the length of the time window for the analysis is fixed for all data, the accuracy and speed of the estimation are drastically improved by introducing a variable-length time window which is determined by the first half cycle of the wavelength of the initial P -wave, because this window tends to reduce the influences of trailing scattered waves. The analysis, using the K-NET dataset, shows that the estimation, using this new approach, is improved by 28% and 0.25 s in accuracy and speed, respectively.
Butsuri-tansa(geophysical Exploration) | 2007
Kimitoshi Ashiya; Shinji Sato; Naoyasu Iwata; Masahiro Korenaga; Hiromitsu Nakamura
Quarterly Report of Rtri | 2015
Naoyasu Iwata; Shunroku Yamamoto; Masahiro Korenaga; Shunta Noda
Archive | 2013
直泰 岩田; Naoyasu Iwata; 俊六 山本; Shunroku Yamamoto
Quarterly Report of Rtri | 2011
Shunroku Yamamoto; Shinji Sato; Naoyasu Iwata; Masahiro Korenaga; Yoshiaki Ito; Shunta Noda
Archive | 2011
Naoyasu Iwata; Shunroku Yamamoto; Masahiro Korenaga; 俊六 山本; 直泰 岩田; 将宏 是永
Quarterly Report of Rtri | 2006
Hidehumi Yokoyama; Kimitoshi Ashiya; Naoyasu Iwata
Proceedings of the 12th SEGJ International Symposium, Tokyo, Japan, 18-20 November 2015 | 2015
Kyosuke Okamoto; Seiji Tsuno; Naoyasu Iwata; Kimitoshi Sakai; Kohei Tanaka; Atsuhiro Usami; Kaoru Kobayashi; Masaya Hirabayashi
Archive | 2010
Naoyasu Iwata; Shunroku Yamamoto; 俊六 山本; 直泰 岩田
Quarterly Report of Rtri | 2017
Shunroku Yamamoto; Naoyasu Iwata
