How widespread was the impact of the Sichuan earthquake?

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The Sichuan earthquake's impact was felt across a wide geographical area, including major cities hundreds of kilometres from the epicentre.

A magnitude 6.8 earthquake struck China's Sichuan province on September 5, with tremors reaching the provincial capital Chengdu and extending as far as the cities of Xian and Changsha, located hundreds of kilometres away. The epicentre was identified in the town of Luding, approximately 226 km southwest of Chengdu, a metropolis with a population of around 21 million.
Shaking Experienced in Distant Cities

The seismic event on September 5 generated significant shaking that was perceptible not only in Chengdu but also in cities located at considerable distances. Residents in Xian, the capital of Shaanxi province, and Changsha, the capital of Hunan province, reported feeling the earthquake, underscoring the extensive reach of the tremors. This wide geographical spread indicates the intensity of the seismic waves generated by the magnitude 6.8 quake.
Proximity of Population to Epicentre

The town of Luding, where the earthquake's epicentre was located at a depth of 16 km, is surrounded by populated areas. Within a 20-km radius of the epicentre, approximately 39,000 individuals reside. Furthermore, a much larger population of 1.55 million people lives within a 100-km radius of the epicentre, highlighting the potential scale of impact in the immediate vicinity of the seismic origin.
Historical Context of Sichuan Earthquakes

Sichuan province is situated in a tectonically active region and has a history of significant seismic activity. The September 5 earthquake was the strongest to hit the province since April 2013, when a magnitude 7.0 earthquake struck the city of Yaan, resulting in over 100 fatalities and thousands of injuries. Historically, the most devastating earthquake on record for Sichuan was the magnitude 8.0 quake in Wenchuan in May 2008, which claimed nearly 70,000 lives and caused widespread destruction. An aftershock of magnitude 4.2 also struck the city of Yaan, located about 100 km southwest of Chengdu, shortly after the main tremor.

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How widespread was the impact of the Sichuan earthquake?

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