The epicenter is the point on the surface directly above the hypocenter 震中：地面上正对着震源的地方。
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English : ganbaku dome is a destroyed building close to the hypocenter in downtown hiroshima where usaf dropped the first atomic bomb ever used in a real war 中文? :原爆圆顶是一栋在美军投掷原子弹轰炸广岛后残存下来的废墟建筑，由于距离原子弹实际的爆炸中心非常近，因此被保存作为这起悲剧的纪念性建筑。
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In the case that hypocenter depth is far less than the epicenter distance without depth phases available , only the relative epicenter distribution could be obtained accurately by double difference method , the depth determined would be not stable 当震源深度远小于震中距时，如果没有深度震相的参与，只能得到误差较小的震中相对分布，深度的相对位置仍有较大的误差。
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Based on the fromer study of mine tectonic , hydrology , tunnel deformation , etc . , 3 - d numerical simulation of current tectonic stress field of lvjiatuo coal mine was done in this thesis , combining with local hypocenter mechanism solve and relational stress in - situ measuring value regression analysis has been done to the simulation result , and the reasonable results are gained those will offer dependence for disposing the tunnels more rational and making tunnel supporting more economical and safer 摘要本文在前人对吕家坨矿进行矿井构造、水文地质、巷道变形等研究的基础上，结合该地区的震源机制解及有关的应力实测值，对矿区现今构造应力场进行了三维数值模拟，并对模拟结果进行了线性回归分析，得到了与现实较为符合的结论，为更合理的巷道布置和更经济而安全的巷道支护提供依据。
