• Download Matlab scripts and demo     for de-tiding gappy DART records
  • Demo: De-tiding tsunami records at DART buoys "during an event"

    EOF filter is used to detide an ongoing tsunami record at a DART buoy.

    The first frame in each QuickTime movie shows a section of a DART record containing a historical tsunami (black dots, a mix of 15-min (standard reporting mode) and 1-min (event mode) measurements), a tidal estimate with a low-pass Butterworth filter (cut-off at 3 hours) (red), and a difference of the two used as a reference tsunami signal (bottom pane).

    The rest of a movie shows tsunami signal extracted "during an event", while the data are coming in.

    To imitate an event situation, a flow of 1-min data starts at a peak of either seismic or tsunamu or trigger pulse signal, whereas a flow of 15-min data is terminated 4 or 6 hours before the start of the 1-min reporting mode.

    Top pane: a DART record up to a current moment (black) and a tidal estimate with an EOF filter (red). Middle pane: the difference of the two (tsunami, black) and the reference tsunami signal (cyan). Bottom pane: the difference between the reference and the EOF-filtered tsunami.

    Nov. 15, 2006 Kuril Isl. tsunami (6 hour gap in data) recorded at

  • DART 46413
  • DART 46408;
  • DART 46402
  • DART 46403
  • Jan. 13, 2007 Kuril Isl. tsunami (4 hour gap in data) recorded at

  • DART 21413
  • DART 21414
  • DART 46408
  • DART 46413
  • Aug. 15, 2007 Peru tsunami (4 hour gap in data) recorded at

  • DART 32401

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