Rapid coseismic fault determination of consecutive large interplate earthquakes: The 2011 tohoku-oki sequence

Yusaku Ohta, Tatsuya Kobayashi, Ryota Hino, Tomotsugu Demachi, Satoshi Miura

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

13 Citations (Scopus)


Real-time monitoring of crustal deformation is important in achieving rapid understanding of earthquake magnitude and fault model. Recently, an algorithm called Real-time Automatic detection method for Permanent Displacement (“RAPiD”) has been developed to detect/estimate static ground displacements due to earthquake faulting from real-time kinematic (RTK)-GPS time series. We applied this algorithm to the 2011 off Ibaraki earthquake (Mw 7.7), which occurred only 30 min after the 2011 Tohoku-Oki earthquake (Mw 9.0). The RAPiD algorithm worked well with the long baseline RTK-GPS time series for quasi real-time coseismic displacement detection and estimation. A quasi real-time fault determinationwas also attempted with an automatic detection/estimation displacement field. We found that the estimated moment release reached Mw 7.7 60 s after the origin time, almost the same as the actual seismic moment for this earthquake. We also assessed the long-term stability of the RTK-GPS time series under a 200-km baseline condition. We found the time series precision degraded slightly in summer compared with winter. However, the total stability is good for monitoring crustal deformation. These results suggest clearly that using real-time GPS data in conjunction with the RAPiD algorithm can provide rapid coseismic fault determination, even for consecutive large earthquakes.

Original languageEnglish
Title of host publicationIAG 150 Years - Proceedings of the 2013 IAG Scientific Assembly
EditorsChris Rizos, Pascal Willis
PublisherSpringer Verlag
Number of pages9
ISBN (Print)9783319246031
Publication statusPublished - 2016
Event150th Anniversary with a Scientific Assembly, IAG 2013 - Potsdam, Germany
Duration: 2013 Sept 22013 Sept 6

Publication series

NameInternational Association of Geodesy Symposia
ISSN (Print)0939-9585


Conference150th Anniversary with a Scientific Assembly, IAG 2013


  • Rapid coseismic fault determination
  • The 2011 tohoku earthquake
  • Tsunami early warning


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