On September 15, 2015 witness filmed a very strange cloud phenomenon above Costa Rica at about 3.00 pm local time.
We may wonder whether this strange cloud is just a natural phenomenon or a so-called earthquake light or there's more than our eyes can see? Is this connected to Chile's earthquake some time after which was 8,3 magnitude.
They are reported to have different shapes with a white to bluish hue, but occasionally they have been reported having a wider color spectrum.
The luminosity is reported to be visible for several seconds, but has also been reported to last for tens of minutes.
A different explanation involves intense electric fields created piezoelectrically by tectonic movements.
Another possible explanation is local disruption of the Earth's magnetic field and/or ionosphere in the region of tectonic stress, resulting in the observed glow effects either from ionospheric radiative recombination at lower altitudes and greater atmospheric pressure.