Why did an earthquake happen in Linxia, Gansu?

The plates on the earth are constantly colliding and pushing each other during tectonic movements.

When the stress of rock exceeds its strength limit, it will produce fracture phenomenon and trigger earthquake events. Linxia, Gansu Province and its surrounding areas are located between the eastern part of Chinese mainland and the Qinghai-Tibet Plateau, near the intersection of Indian plate and Eurasian plate. This area often suffers from huge pressure accumulation between two main plates, which leads to active tectonic deformation. As time goes on, the accumulated pressure gradually increases to the point where it is impossible to maintain balance. When it reaches or exceeds the apex of the mortgage cover inside the rock material, it will no longer be able to support the external force, forcing the child to suddenly separate.