Open AccessReal-Time GNSS Analysis System REGARD: An Overview and Recent Results
Author(s) -
Satoshi Kawamoto,
Naofumi Takamatsu,
Satoshi Abe,
Kohei Miyagawa,
Yusaku Ohta,
Masaru Todoriki,
Takuya Nishimura
Publication year - 2018
Publication title -
journal of disaster research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.332
H-Index - 18
eISSN - 1883-8030
pISSN - 1881-2473
DOI - 10.20965/jdr.2018.p0440
Subject(s) - gnss applications , satellite system , warning system , earthquake warning system , global positioning system , seismology , real time computing , fault (geology) , computer science , geology , telecommunications
A new real-time Global Navigation Satellite System (GNSS) analysis system named REGARD has been launched to provide finite-fault models for large earthquakes with magnitudes =8 in real time. The finite-fault estimates using GNSS positioning are free from saturation problems and are very robust for modeling large earthquakes. The REGARD system processes ∼1,200 stations of GEONET, and event detection and finite-fault model inversion routines are implemented. Tests for the case of the 2011 Tohoku earthquake ( M w 9.0) and a simulated Nankai Trough earthquake ( M w 8.7) show that the REGARD system can provide reliable finite-fault models for large earthquakes. Furthermore, operational real-time results for the 2016 Kumamoto earthquake ( M j 7.3) demonstrated the capability of this system to model inland earthquakes. These results imply the possibility of improving tsunami simulations and/or hazard information using rapid finite-fault models. Efforts to integrate real-time GNSS with current warning systems are currently being implemented around the world, and the REGARD system will join these systems in the near future.