Magnitude 5.6 Earthquake in Gansu Province, China.

The China Earthquake Networks Center recorded a Magnitude 6.8 Earthquake at a depth of 10 km beneath Longxi County in southern Gansu Province, slightly before 5.50 am local time on Saturday 27 September 2025 (slightly before 9.50 pm on Friday 26 September, GMT). The Earthquake was felt across southeastern Gansu. Seventeen houses were destroyed by the event, with 4382 damaged, eleven people injured and 7812 in need of at least temporary rehousing. 

Emergency workers clearing debris following a Magnitude 5.6 Earthquake in Gansu Province, China, on Saturday 27 September 2025. Xinhau.

Much of western China and neighbouring areas of Central Asia and the Himalayas, are prone to Earthquakes caused by the impact of the Indian Plate into Eurasia from the south. The Indian Plate is moving northwards at a rate of 5 cm per year, causing it to impact into Eurasia, which is also moving northward, but only at a rate of 2 cm per year. When two tectonic plates collide in this way and one or both are oceanic then one will be subducted beneath the other (if one of the plates is continental then the other will be subducted), but if both plates are continental then subduction will not fully occur, but instead the plates will crumple, leading to folding and uplift (and quite a lot of Earthquakes). The collision of the Indian and Eurasian plates has lead to the formation of the Himalayan Mountains, the Tibetan Plateau, and the mountains of southwest China, Central Asia and the Hindu Kush.

Tectonic map of Asia, showing relationships between the India–Asia collision, escape of Indonesian and South China blocks seaward, and extension from Siberia to the Pacific margin. (Note also the opening of back-arc basins including the Sea of Japan and the South China Sea, and extension in the Bohai Basin and eastern part of the NCC.) The North China Craton is also strongly influenced by Pacific and palaeo-Pacific subduction, perhaps also inducing extension in the eastern NCC. The palaeo Pacific and Pacific subduction zones developed in the Mesozoic, and also contributed to the hydration of the subcontinental lithospheric mantle beneath the NCC. Kusky et al. (2007).

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