@article{b0206bcfbbb845b8980929337ec477f8,
title = "Real-Time Coseismic Slip Estimation via the GNSS Carrier Phase to Fault Slip Approach: A Case Study of the 2016 Kumamoto Earthquake",
abstract = "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.",
keywords = "GNSS, phase data, real time, tsunami warning",
author = "Yusuke Tanaka and Yusaku Ohta and Shin'ichi Miyazaki",
note = "Funding Information: We are grateful to the Geospatial Information Authority of Japan (GSI) for providing GNSS Earth Observation Network (GEONET) Global Navigation Satellite System (GNSS) data. We are also very grateful to International GNSS Service (IGS) for providing high-quality precise orbit and broadcast orbit information. These data may be found at GSI and NASA websites (http://www.gsi.go.jp and https://cddis.nasa.gov). We thank Peter Cervelli and Emily Montgomery-Brown for providing basic code for the phase-to-slip approach. We would like to thank anonymous reviewers for their many constructive comments on an earlier draft of the manuscript. This study was supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan under the Earthquake and Volcano Hazards Observation and Research Program. This work was also supported by the Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research (KAKENHI; grants: 15H03713, 17H06108, and 18H03828) and by the Toray Science Foundation (Toray Science and Technology Grant). Funding Information: We are grateful to the Geospatial Information Authority of Japan (GSI) for providing GNSS Earth Observation Network (GEONET) Global Navigation Satellite System (GNSS) data. We are also very grateful to International GNSS Service (IGS) for providing high‐quality precise orbit and broadcast orbit information. These data may be found at GSI and NASA websites (http://www.gsi.go. jp and https://cddis.nasa.gov). We thank Peter Cervelli and Emily Montgomery‐Brown for providing basic code for the phase‐to‐slip approach. We would like to thank anonymous reviewers for their many constructive comments on an earlier draft of the manuscript. This study was supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan under the Earthquake and Volcano Hazards Observation and Research Program. This work was also supported by the Japan Society for the Promotion of Science Grants‐in‐Aid for Scientific Research (KAKENHI; grants: 15H03713, 17H06108, and 18H03828) and by the Toray Science Foundation (Toray Science and Technology Grant). Publisher Copyright: {\textcopyright}2019. The Authors.",
year = "2019",
month = feb,
day = "16",
doi = "10.1029/2018GL080741",
language = "English",
volume = "46",
pages = "1367--1374",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "3",
}