TY - JOUR
T1 - Real-Time Coseismic Slip Estimation via the GNSS Carrier Phase to Fault Slip Approach
T2 - A Case Study of the 2016 Kumamoto Earthquake
AU - Tanaka, Yusuke
AU - Ohta, Yusaku
AU - Miyazaki, Shin'ichi
PY - 2019/2/16
Y1 - 2019/2/16
N2 - We investigate the feasibility of Global Navigation Satellite System (GNSS)-based deformation monitoring that detects coseismic fault slip directly from GNSS carrier phases without conventional positioning analysis. This method, which we call the phase-to-slip (PTS) method, does not require high-quality orbital information because it relies only on changes in azimuthal site-to-satellite ranges. With this method, computational costs for real-time seismic monitoring can be reduced. Here we applied the PTS method to the mainshock of the 2016 Kumamoto earthquake by modifying the original algorithm and using both precise orbits by International GNSS Service (IGS) and broadcast orbits. In both cases, obtained coseismic slip distributions agree well with previous studies. Calculated surface displacements from inferred slip distributions also agree with traditional positioning analysis. These results suggests that the PTS method may be useful as a supplement to currently operated deformation monitoring system, especially when external orbit and clock information are not accessible.
AB - We investigate the feasibility of Global Navigation Satellite System (GNSS)-based deformation monitoring that detects coseismic fault slip directly from GNSS carrier phases without conventional positioning analysis. This method, which we call the phase-to-slip (PTS) method, does not require high-quality orbital information because it relies only on changes in azimuthal site-to-satellite ranges. With this method, computational costs for real-time seismic monitoring can be reduced. Here we applied the PTS method to the mainshock of the 2016 Kumamoto earthquake by modifying the original algorithm and using both precise orbits by International GNSS Service (IGS) and broadcast orbits. In both cases, obtained coseismic slip distributions agree well with previous studies. Calculated surface displacements from inferred slip distributions also agree with traditional positioning analysis. These results suggests that the PTS method may be useful as a supplement to currently operated deformation monitoring system, especially when external orbit and clock information are not accessible.
KW - GNSS
KW - phase data
KW - real time
KW - tsunami warning
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U2 - 10.1029/2018GL080741
DO - 10.1029/2018GL080741
M3 - Article
AN - SCOPUS:85061584033
VL - 46
SP - 1367
EP - 1374
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 3
ER -