@article{MAKHILLOJES20148225428,
    title = {Possibility for Identifying the New Subduction Zone from Ionospheric Anomaly 
  for a Deep Earthquake (625.9 km) on 14 August, 2012, M = 7.7 near Poronaysk, Russia: Two-Dimensional Principal Component Analysis},
    journal = {Online Journal of Earth Sciences},
    volume = {8},
    number = {2},
    pages = {31-40},
    year = {2014},
    issn = {1991-7708},
    doi = {ojesci.2014.31.40},
    url = {https://makhillpublications.co/view-article.php?issn=1991-7708&doi=ojesci.2014.31.40},
    author = {Lin},
    keywords = {Two-Dimensional Principal Component Analysis (2DPCA),Total Electron Content (TEC),precursor,ubduction zone,Taiwan},
    abstract = {Two-Dimensional Principal Component Analysis (2DPCA) has been 
  performed to examine ionospheric Total Electron Content (TEC) data in order 
  to detect TEC precursor for a deep earthquake occurred at 02: 59:42 on 14 August, 
  2012 (UTC) (M<SUB>w</SUB> = 7.7) with its depth at 625.9 km near Poronaysk, 
  Russia. The examined TEC data were during the time period from 00:00 on 09 August 
  to 02:50 on 14 August, 2012 (UTC) which were 5 days before the earthquake because 
  the ionospheric precursors usually revealed in such time period. A ionospheric 
  TEC precursor with the more large principal eigenvalues of 2DPCA have been localized 
  around the epicenter during the time period from 02:25-02:30 on 14 August, 2012 
  (UTC) and the duration time was at least 5 min. Ionizing radiation Radon gas 
  release should be a possibility to cause the anomalous TEC fluctuation, e.g., 
  electron density variation. If a mount of radiation radon which caused the TEC 
  anomalies was trapped in the asthenosphere, then the asthenosphere should be 
  very thick with deep bottom in this zone which belongs to the subduction zone 
  between the Pacific plate and the North America. A zone that was previously 
  unknown to be the subduction zone could now be identified as through earthquake-related 
  TEC anomaly. Therefore in this study, not only TEC anomaly could be detected 
  but also new plate boundary with subduction zone is possible to be found. However, 
  if this very deep earthquake does indeed record inter-plate seismicity, then 
  the asthenosphere in this region must have a large thickness.}
    }