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来源：中国日报网 时间：2019-07-05 18:05:03 编辑：刘映红
Rescuers search for people trapped at Shuanghe township, after an earthquake hit Changning county of Yibin city, Southwest China's Sichuan province, June 18, 2019. [Photo by Zeng Lang/chinadaily.com.cn]
As of Thursday morning, over 200 aftershocks had occurred in Yibin, Sichuan province, after the city was struck by a magnitude 6.0 earthquake on June 17. Experts said the frequency of aftershocks, though comparatively high, is still within normal range.
The special geological conditions in the region, which boasts no big seismological faults but many small and widespread ones, are to blame for the frequent aftershocks. Those small faults could have easily been made active after the major quake, the experts said.
According to the China Earthquake Networks Center, 225 aftershocks above magnitude 2 had been recorded as of 11 am on Thursday. The biggest one occurred at 10:17 am on Thursday in Yibin's Gongxian county. It was the fourth aftershock above magnitude 5.
根据中国地震台网中心的数据，截至周四上午11点，已记录到225级以上的余震。 最大的一次发生在周四上午10点17分在宜宾珙县。 这是5级以上的第四次余震。
"The frequency is within the normal range. The public don't need to panic," said Du Fang, director of the Sichuan Provincial Earthquake Forecast Research Center.
The June 17 earthquake, which claimed 13 lives, is the biggest ever recorded in Yibin.
Du said the possibility of another major earthquake in the region is small as there is no active big seismological fault within a 50-kilometer radius of the stricken area.
He said the earthquake and its aftershocks, though not high in magnitude, still resulted in some causalities and damage as their epicenters are close to the ground. Poor quality construction of buildings was also a contributing factor.
Yi Guixi, a researcher with the center, said Yibin could continue to be hit by aftershocks for an extended period of time because of seismic interaction among secondary faults.
"Generally, there has been a decline trend in the frequency," he said.
Du Bin, an official in charge of earthquake monitoring and forecasts, said Sichuan province has been accelerating the construction of its seismic intensity rapid reporting and early warning project. The project is expected to start operations this year.