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]
2019年6月28日，在四川省宜宾市长宁县发生地震后，救援人员搜寻被困在双河镇的人。
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.
截止这周星期四上午，四川省宜宾市自6月17日发生里氏6.0级地震后，已发生超过200次余震。专家表示，余震的频率虽然相对较高，但依然属于正常现象。
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.
该区域特殊的地理条件，长宁一带的地质构造规模小，但多条次级断层纵横交错，这是引起余震多发的主要原因。专家说，在一次大的地震发生后小断层容易被激活。
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.
四川省地震预报研究中心主任杜方说：“这是属于正常现象，民众不需要特别担心”。
The June 17 earthquake, which claimed 13 lives, is the biggest ever recorded in Yibin.
长宁“6.17”地震总计造成13人死亡，是宜宾有史以来最大的一次。
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.
杜方说，该地区发生另一场大地震的可能性很小，因为在受灾地区半径50公里范围内没有活跃的大地震断层。
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.
他说，地震及其余震虽然幅度不大，但由于它们的中心接近地面，仍会造成一些伤亡和破坏。建筑质量较差也是主要的因素。
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.
地震研究中心的研究员易桂喜认为,由于次级断层之间的地震相互作用，宜宾可能会继续受到余震的长时间撞击。
"Generally, there has been a decline trend in the frequency," he said.
他说：“一般来说，频率会呈下降趋势”。
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.
负责地震监测和预报的负责人杜斌表示，四川省一直在加快建设抗震强度快报和预警项目。该项目预计将于今年开始运营。
