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Maximum wave amplitude for the October 28, 2012 Haida Gwaii Tsunami

Maximum wave amplitude for the October 28, 2012 Haida Gwaii Tsunami computed with the MOST forecast model. The insets show the space-time TEC variations at 2 epochs within 27 mins interval (08:10 to 08:37 UT - October 28, 2012) at the sub-ionospheric points for 5 satellites showing TIDs, overplotted the tsunami MOST model. The TIDs are consistent in time and space with the tsunami waves.

June 19, 2017

Tsunamis can produce gravity waves that propagate up to the ionosphere, is a region of the Earth’s atmosphere where there is a high concentration of ions and electrons that can affect the spread of radio waves. These ionospheric disturbances can be studied in detail using ionospheric total electron content (TEC) measurements collected by continuously operating ground-based receivers, for example GPS, from the Global Navigation Satellite Systems (GNSS).

The existing tsunami warning system developed by the NOAA Center for Tsunami Research (NCTR) at PMEL currently relies on numerical modeling MOST (Method of Splitting Tsunami model) and buoy observations to produce timely and accurate tsunami forecast for potentially vulnerable U.S. coastal communities. Ground GNSS observations processed in real-time may have the potential to enhance the current system by independently providing the tsunami speed and amplitude.

In a study published in Scientific Reports, the authors present results using a new open-source approach named VARION (Variometric Approach for Real-Time Ionosphere Observation) that focuses on the real-time detection of the Traveling Iononspheric Disturbances (TIDs) caused by tsunami atmospheric gravity waves. This method, combined with real-time data from different sources (e.g. seismometers, buoys, GNSS receivers), may be considered as a novel contribution to future integrated operational tsunami early warning system.

This study was a collaboration among the University of Rome, NASA JPL, NCTR and the University of Washington. Dr. Yong Wei from NCTR and UW’s Joint Institute for the Study of the Atmosphere and Ocean provided MOST modeling of tsunami waves near Hawaiian Islands, more than 4,000-km away from the tsunami source, generated by the October 28, 2012 Haida Gwaii earthquake. The model/data comparison shows the TIDs are very consistent in time and space with the model simulated tsunami waves, offering insight with regard to the ionospheric response to the tsunami-driven atmospheric gravity wave.

PMEL in the News

June 13, 2017

In July, three odd-looking, 23-foot-long sailboats will launch from a dock in Alaska's Dutch Harbor. They will meander the seas between the U.S. and Russia to track ice melt, measure the ...

June 13, 2017

RAVE To NOAA (National Oceanic and Atmospheric Administration) for their excellent June 9 Open House. The exhibits and guided tours were very informative and well coordinated.

June 07, 2017

The National Oceanic and Atmospheric Association (NOAA) Sandpoint center will host a behind-the-scenes tour during an open house Friday. The open house is a family-friendly event with activities for children. It’s a chance to meet oceanographers, marine biologists, meteorologists and engineers...