Guest Speaker - Dr. Attila Komjathy -FR

Event Date(s):
February 13, 2014
12:30 PM - 02:30 PM

Event Details:

Geodesy and Geomatics Engineering presents a special seminar by Dr. Attila Komjathy, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, entitled Detection of Natural-Hazards-Generated Ionosphere Perturbations and Related New Applications.

Natural hazards, including earthquakes, volcanic eruptions, and tsunamis, have been significant
threats to humans throughout recorded history. The Global Positioning System satellites have
become primary sensors to measure signatures associated with such natural hazards. These
signatures typically include GPS-derived seismic deformation measurements, co-seismic vertical
displacements, and real-time GPS-derived ocean buoy positioning estimates. Another way to use
GPS observables is to compute the ionospheric total electron content (TEC) to measure and
monitor post-seismic ionospheric disturbances caused by earthquakes, tsunamis, and volcanic

Research at the University of New Brunswick (UNB) laid the foundations to model the threedimensional
ionosphere at NASA’s Jet Propulsion Laboratory by ingesting ground- and spacebased
GPS measurements into the state-of-the-art Global Assimilative Ionosphere Modeling
(GAIM) software. As an outcome of the research, new and innovative GPS applications have
been invented including the use of ionospheric measurements to detect tiny fluctuations in the
GPS signals between the spacecraft and GPS receivers caused by natural hazards occurring on or
near the Earth’s surface. This continuing research is expected to provide early warning for
earthquakes, tsunamis, volcanic eruptions, and asteroid impacts, for example, using GPS and
other global navigation satellite systems.

The talk will demonstrate new and upcoming applications including recent natural and accidental
hazards that generated TEC perturbations to perform state-of-the-art imaging and modeling of
earthquakes, tsunamis, and asteroid impacts. By studying the propagation properties of
ionospheric perturbations generated by natural hazards along with applying sophisticated firstprinciples
physics-based modeling, we are on track to develop new technologies, which can
potentially save human lives and minimize property damage.

Building: Headhall

Room Number: E4


Michelle Ryan
1 506 453 4698