Yes, Magnetic anomaly data have been investigated as earthquake precursors in countries like Japan, Russia, and China, where researchers observed changes in the geomagnetic field before seismic events, but despite these efforts the method remains unreliable and is generally treated only as a supplementary indicator rather than a standalone prediction tool

for better reliability researchers usually combine them with alternatives such as GPS crustal deformation data, seismic foreshock patterns, radon gas emissions, or satellite-based ionospheric observations, since these methods provide stronger and more consistent correlations with earthquake preparation processes

Dear Imanuela Indah Pertiwi ,

If you want to predict earthquakes, this is not the way to approach this problem. The answer to the question that your colleague: Mohammed Abdelouahab Tabal gave is correct.

If you want to try a unified method for predicting earthquakes, I will share my ideas on this, if I can personally participate in the instrumental verification of these... So I only ask for accommodation and food... nothing else. I am not selective.

Regards,

Laszlo