Hi Shan. Here is another link to a study being done in Mexico, which involves the disturbance of the ionosphere in or before 1996. I don’t know what the current research might be. Take Care…Don in creepy town

“A system of monitoring the occurrences of earthquakes from space must rely on the connection between the lithosphere, the ionosphere and the magnetosphere of the Earth. This connection may be established either from ground or from space.

There is at present factual material that shows evidence of a response in the ionosphere from seismic activity. Above the epicentre of a future earthquake, at altitudes from about 400 km to about 1000 km in the ionosphere, there appear macroscopic changes of the ionospheric parameters prior to the occurrence of the earthquake.

The presence in the ionosphere of precursors of earthquakes affords the possibility in principle of prediction by remote space-ground methods. The study of the influence of the seismic activity on the ionosphere began more than 30 years ago (see references). Some of the observations are the following.
- An anomaly in the absorption of cosmic ray emission after the 1960 earthquake in Chile lasted for 6 days (Warwick, 1963).

- Strong changes in the parameters of the ionosphere caused by the large earthquake in Alaska in 1964 (Davies and Barker, 1965).

- The discovery by Tarantsev and Birfeld (1973) that acoustic waves are involved in the connection between seismic activity and the ionosphere.

Since 1975, when the Soviet-French experiment "Arkad" was active in the ionosphere and the magnetosphere, processes caused by seismic activity were observed. The identification of these processes took place not at the time of the earthquake but hours or days before. Similar phenomena were observed on "Intercosmos 19", "Intercosmos 24", "OGO-6", "Nimbus", "GEOS 1", "GEOS 2", and other satellites. We propose five main types of ionospheric perturbations that accompany earthquakes.”

• Ionosphere Disturbance