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Otsu, Takayuki*; Arai, Nobuo*; Nogami, Mami*; Kijima, Yuichi; Yamamoto, Yoichi; Oda, Tetsuzo
no journal, ,
Japan has two kinds of NDCs, one is NDC-1 in charge of analysis of SHI data and the other is NDC-2 in charge of RN issue. Both NDCs participated in the NDC preparedness Exercise (NPE) 2012 and tried to get results collaboratively. In this exercise, NDC-2 made backward and forward tracking using ATM. NDC-1 tried to select one event from among several candidate events by the result of ATM and made some seismo-acoustic analysis. NDC-1 tried to sift through candidate events from REB using the results from NDC-2. Finally two possible candidate events were selected. These events are located around Mezhdurechensk, Kemerovo Oblast, Russia. It was very difficult to distinguish which event was the candidate event, because these waveforms have similar characteristics each other and look like small explosion.
Fujii, Takanari*; Otsu, Takayuki*; Yagi, Masanori*; Yonezawa, Chushiro*; Jih, R.*; Kalinowski, M.*; Kang, I.-B.*; Chi, H.-C.*; Yamamoto, Yoichi; Kijima, Yuichi
no journal, ,
As a part of East Asia Regional NDC Workshop 2014 Mongolia (EARNW2014), the common exercise took place for the purpose of investigation from both of radionuclide and waveform analysis. Each participating NDC analyzed distributed fictitious RN data and real SHI data including non-IMS to find and investigate candidate event. The Japanese NDC-1 (JWA) tried to locate and discriminate the event utilizing local seismic observation data such as NECESSArray (NorthEast China Extended SeiSmic Array) and Korean local data kindly provided by KIGAM. Signals from this event were detected at many stations in such non-IMS network, and it indicated that these local/regional seismic data could contribute largely to estimate more reliable event location and discrimination.
Kijima, Yuichi; Yamamoto, Yoichi; Motohashi, Masashi*; Otsu, Takayuki*
no journal, ,
The CTBT National Operation System of Japan (NOSJ) consists of two NDCs, NDC-1 (Japan Weather Association; JWA) in charge of analysis of SHI data and NDC-2 (Japan Atomic Energy Agency; JAEA) in charge of analysis of RN data and ATM, and the Center for the Promotion of Disarmament and Non-Proliferation (CPDNP) which is the secretariat of NOSJ. The NDCs participated in the NDC preparedness exercise 2015 (NPE 2015). At first, NDC-2 made analysis of artificial (simulated) and real RN data for identification and quantification of RN, and ATM analysis for estimation of the possible source region. Then NDC-1 made analysis of seismic waveform to identify the epicenter using the result of NDC-2. Both NDCs tried to get a final conclusion collaboratively.