Abnormal earthshine refers to the colorful
light from the ground before the earthquake.
It shows mixed colors rarely seen in daily life,
such as silver blue, white and purple, but mainly
of them are red and white. It also has different
shapes like ribbon, globe, column, diffusing shape
and so on.
Generally, earthshine occurs in a wide range, usually
within a few hours to a few minutes before the earthquake,
lasting several seconds.
Precursors of Tangshan Earthquake
On the evening of July 28, 1976, in the northeast of
Tangshan, colorful beams of light rose like powerful
signal lights, shining the earth as bright as day.
After the flame scattered and disappeared, the ground
began to tremble. After a few seconds, Tangshan became
ruins. Actually, this was a strong seismic precursor,
known as the earthshine.
Records of Seismic Luminescence
Many strong earthquakes are accompanied by luminescence. This
peculiar and terrifying natural phenomenon was noticed thousands
of years ago. China is the first country in the world to record
In foreign countries, earthshine has also attracted wide attention.
This record was first published in the Chronicles by the Roman historian
Tacilan, which described the strong earthquake in Asia Minor in 17 AD.
The book says that before the earthquake the sky was seen sparkling.