用震源位置的标准计算机码重新定位地震事件。
The events were relocated using standard computer codes for hypocentral locations.
震源位置分布表明，北京西北地区存在两条主要的地震活动断裂带。
The distribution of hypocenters shows that there are two major seismic active belts in the northwestern Beijing.
通过对这些记录进行同样的计算，研究人员能够准确计算出这些小地震的震源位置。
By performing the same calculations on those records, the researchers could work out exactly where the shocks originated.
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