[1] Recently, it has been shown that the ionosphere is capable of showing images of seismic fault shortly after an earthquake. This gives rise to the idea of retrieval of seismic information from ionospheric observations. As the first step toward such inversion, here we study distinctive features of ionospheric response to shallow earthquakes, both submarine and inland, of moment magnitudes Mw7.2-9.1. Using GPS measurements of the ionospheric total electron content, we show that: (1) the amplitude of coseismic total electron content variations in the near-field is larger after more powerful earthquakes, and (2) stronger earthquakes (M > 7.9) are in general characterized by a longer negative phase in coseismic perturbations. Citation: Astafyeva, E., S. Shalimov, E. Olshanskaya, and P. Lognonné (2013), Ionospheric response to earthquakes of different magnitudes: Larger quakes perturb the ionosphere stronger and longer, Geophys.

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Fairly complex processes of lithosphere–ionosphere interactions can be explored by diagnosing the outer envelopes of the Earth with the use of global satellite navigational systems and equally global network of ground receivers and very-low-frequency transmitters. The earthquake and tsunami impacts on the ionosphere are the example of these processes. The current advances in the studies of these processes are briefly outlined.