但是震源仅仅距地面5千米，是上次的一半，距离震中仅仅10千米，而上次则是30千米。
But at 5km (3 miles) down, its focus was at half the depth—and the epicentre a mere 10km from the city compared with 30km last time.
美国地质调查局最初估计，震源为142英里(230千米)，但紧接着便修正为6英里(10千米)，简直是紧贴着地面！
The Geological Survey initially said the quake had a depth of 142 miles (230km), but it later revised its estimate to say the quake was 6 miles (10 km) deep, putting it fairly close to the surface.
对于同样大小的地震，由于震源深度不一样，对地面造成的破坏程度也不一样。
An earthquake's point of initial ground rupture is called its focus or hypocenter.
空间与地面测量及震源机制解共同证实，东南沿海现时应力场主压应力方位为NW (NWW) -SE (SEE)。
Space geodesy, terrestrial deformation survey and focal mechanics resolution together confirm that the present-time principal compressing stress orientation is NW (NWW) -se (SEE).
聚能震源弹采用定向聚能的原理，使激发的能量集中向下，减少了对地面的冲击。
The concentrating energy source focuses the energy down and reduces percussion for the ground by using the theory of directional charge.
地面上正对着震源的地方。
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。
The epicenter is the point on the surface directly above the hypocenter.
已有的研究表明，炸药震源在井下激发、可控震源在地面垂向振动，均会产生较强的纯纵波和一定强度的纯横波；泊松比差别较大的分界面有利于形成较强的透射转换横波。
Previous studies show that both dynamite borehole shots and vertical vibrations from controllable seismic sources at the surface will produce relatively strong pure P-waves and weaker pure S-waves.
震源浅的地震造成的破坏性更大，因为能量的释放距离地面更近，引发的震动更剧烈。
Shallow quakes cause more damage because the energy is released closer to the earth's surface and triggers stronger shaking.
地震开始发生的地点称为震源，震源正上方的地面称为震中。
The earthquake started in place as the source, the source is at the top of the ground known as the epicenter.
地震开始发生的地点称为震源，震源正上方的地面称为震中。
The earthquake started in place as the source, the source is at the top of the ground known as the epicenter.
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