TY - JOUR
T1 - First result from the GEONET real-time analysis system (REGARD)
T2 - The case of the 2016 Kumamoto earthquakes
AU - Kawamoto, Satoshi
AU - Hiyama, Yohei
AU - Ohta, Yusaku
AU - Nishimura, Takuya
N1 - Funding Information:
The authors are indebted to GSI colleagues for the operation of the REGARD system. The authors thank the Japan Meteorological Agency (JMA) for providing the earthquake catalog and the International GNSS Service (IGS) for providing the products used in this study. RTKLIB 2.4.2 software (Takasu ) was used for the GNSS analysis. Figures are drawn using Generic Mapping Tools (Wessel and Smith ) and matplotlib (Hunter ). We also acknowledge the comments by Yehuda Bock and an anonymous reviewer in improving the manuscript. This work was partly supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number 15H03713.
Publisher Copyright:
© The Author(s) 2016.
PY - 2016/12/1
Y1 - 2016/12/1
N2 - We present the initial results of rapid fault estimations for the 2016 Kumamoto earthquake on April 16 (Mj 7.3), and coseismic displacements caused by the two large foreshocks that occurred on April 14 (Mj 6.5) and April 15 (Mj 6.4) from the GEONET real-time analysis system (REGARD), which is based on a Global Navigation Satellite System (GNSS) kinematic positioning technique. The real-time finite-fault estimate (Mw 6.85) was obtained within 1 min and converged to Mw 6.96 within 5 min of the origin time of the mainshock (Mj 7.3). The finite-fault estimate shows right-lateral strike-slip fault along the Futagawa fault segment, which is consistent with the finite-fault model inferred from post-processed GNSS and InSAR analysis. Furthermore, significant coseismic displacements were observed due to the April 14 and April 15 foreshocks at nearby sites, though these earthquakes were smaller than the pre-assigned system threshold. Our results also demonstrate the potential for the GNSS-based earthquake early warning system for inland earthquakes.
AB - We present the initial results of rapid fault estimations for the 2016 Kumamoto earthquake on April 16 (Mj 7.3), and coseismic displacements caused by the two large foreshocks that occurred on April 14 (Mj 6.5) and April 15 (Mj 6.4) from the GEONET real-time analysis system (REGARD), which is based on a Global Navigation Satellite System (GNSS) kinematic positioning technique. The real-time finite-fault estimate (Mw 6.85) was obtained within 1 min and converged to Mw 6.96 within 5 min of the origin time of the mainshock (Mj 7.3). The finite-fault estimate shows right-lateral strike-slip fault along the Futagawa fault segment, which is consistent with the finite-fault model inferred from post-processed GNSS and InSAR analysis. Furthermore, significant coseismic displacements were observed due to the April 14 and April 15 foreshocks at nearby sites, though these earthquakes were smaller than the pre-assigned system threshold. Our results also demonstrate the potential for the GNSS-based earthquake early warning system for inland earthquakes.
KW - GNSS real-time positioning
KW - Rapid source extent estimation
KW - Real-time magnitude estimation
KW - The 2016 Kumamoto earthquakes
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U2 - 10.1186/s40623-016-0564-4
DO - 10.1186/s40623-016-0564-4
M3 - Article
AN - SCOPUS:84996598103
SN - 1343-8832
VL - 68
JO - Earth, Planets and Space
JF - Earth, Planets and Space
IS - 1
M1 - 190
ER -