Japan Geoscience Union Meeting 2015

Presentation information


Symbol S (Solid Earth Sciences) » S-SS Seismology

[S-SS24] Application and Future Development of Earthquake Early Warning

Wed. May 27, 2015 11:00 AM - 11:45 AM A06 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Masumi Yamada(Disaster Prevention Research Institute, Kyoto University), Masaki Nakamura(JMA), Mitsuyuki Hoshiba(Meteorological Research Institute), Hiroshi Tsuruoka(Earthquake Research Institute, Tokyo Univ.), Shin Aoi(National Research Institute for Earth Science and Disaster Prevention), Shunroku Yamamoto(Railway Technical Research Institute), Chair:Mitsuyuki Hoshiba(Meteorological Research Institute), Hiroshi Tsuruoka(Earthquake Research Institute, Tokyo Univ.)

11:33 AM - 11:36 AM

[SSS24-P04] REGARD - Real-time GEONET Analysis System for Rapid Deformation Monitoring -

3-min talk in an oral session

*Yudai SATO1, Kohei MIYAGAWA1, Satoshi KAWAMOTO1, Kennichi OSHIMA1, Hiroki MURAMATSU1, Takaaki INUKAI1, Yusaku OHTA2, Tomotsugu DEMACHI2, Satoshi MIURA2, Ryota HINO2, Yasuhiro NAKAMURA3, Mai NISHIYAMA3, Yuki DOUKE3 (1.GSI of Japan, 2.Graduate School of Science, Tohoku University, 3.Hitachi Zosen Corporation)

Keywords:GEONET, RTK-GNSS, real-time

Geospatial Information Authority of Japan (GSI) has been operating a continuous GNSS observation network system since 1994. This system is known as GEONET (GNSS Earth Observation Network) and consists of approximately 1300 nationwide GNSS stations (GEONET station) and the analysis center. Most stations collect GNSS data with 1-Hz sampling and transfer them to the analysis center in real time. Those data are available for surveying or research using real-time kinematic positioning technique. This technique is expected for describing cataclysmic earthquake from crustal displacement in short time especially after the 2011 off the Pacific Coast of Tohoku Earthquake in March 2011.

GSI and Tohoku University have developed the Real-time GEONET Analysis System for Rapid Deformation Monitoring (REGARD) since September 2011 to estimate moment magnitudes (Mw) soon after large earthquakes struck. This system consists of three subsystems. First subsystem does real-time kinematic positioning using RTKLIB (Takasu, 2011) and GSILIB (GSI, 2015). Second one detects seismogenic behavior using the RAPiD algorithm (Ohta et al. 2012) or the Earthquake Early Warning (Kamigaichi et al. 2009) and immediately run the third subsystem. This subsystem estimates Mw within three minutes using displacement vectors of GEONET stations (Kawamoto, 2014). Finally, results are mailed to persons involved.

We tested this system in 2012, using 143 GEONET stations located in the Tohoku region. Last year, we expanded its function by using all the stations receiving 1-Hz streaming data covering almost all lands of Japan and enhanced its redundancy by carrying out two independent processing in parallel. In this year, we enhance real-time kinematic positioning by using QZSS and GLONASS as well as GPS. We also improve the browser used in the agency to search for previous results and visually recognize results of the real-time kinematic positioning.

In this presentation, we report the brief overview and the current situation of REGARD, including the accuracy enhancement and the browsing software.