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Reasons for 36 yearlong aftershocks in Tangshan

By Jin Yu, Deng Qi (Science and Technology Daily)

15:48, May 31, 2012

Edited and translated by People's Daily Online

On the morning of May 28, a magnitude-4.8 earthquake shook Tangshan, 36 years after the Tangshan Earthquake. According to China Earthquake Networks Center, this earthquake was an aftershock of Tangshan Earthquake in 1976. Officials said that no destructive earthquakes are expected to rattle Tangshan in the near future.

A few houses in Tangshan crack

At 10:22 a.m. on May 28, a magnitude-4.8 earthquake with a depth of 8 kilometers, took place in the bordering area (39.7 degrees north latitude and 118.5 degrees east longitude) between a Tangshan City district and Luanxian County in Hebei Province. The epicenter of the earthquake is only 180 kilometers away from Beijing, and minor tremors were also felt in Beijing, Tianjin and Qinhuangdao.

According to news from the Seismological Bureau of Tangshan City, minor tremors were obvious near the Tangshan epicenter, and especially strong in Tanghai, Luan County and urban districts of Tangshan City. An official said, “I could see the chairs shaking, but the house is undamaged, and the earthquake felt a bit intense.”

According to the bureau, the seismic intensity in Beijing area was at about four-five degrees.

Earthquake happened 36 years later still an aftershock

The Seismological Bureau of Tangshan City said that, “the earthquake is preliminarily deemed as normal fluctuation of aftershocks of Tangshan old seismic zone”; “Analyzing from the overall characteristics of sequence type of Tangshan Earthquake, this is of a main shock –aftershock type, it is the normal fluctuation of seismic activity in our city. It’s not likely for our city to be hit by destructive earthquakes.”

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