| 1. | The focal depth was about 6 mi .
震源深度约6哩。 |
| 2. | This requirement manifests itself in terms of multiple sources .
这一要求本身表明要用多震源。 |
| 3. | The point on the earth's surface directly above is called the epicenter .
地表上直接对着震源的那一点称为震中。 |
| 4. | Very few seismograms showing motion near to the source are available .
可以利用的记录震源附近运动的地震图很少。 |
| 5. | Depths of these hypocenters concentrate at about 12km deep in the upper crust .
这些震源深度集中在地壳上部约12公里处。 |
| 6. | The subsurface coverage is from 13 to a point halfway between 24 and the source .
地下覆盖段是从13道到24道至震源的中点。 |
| 7. | The wave motion bears the key signature imparted by the nature and extent of the source .
波动具有由震源的性质和范围造成的主要特征。 |
| 8. | Nondynamite sources make it possible to achieve the advantages of shooting a large number of distributed shots .
非炸药震源具有激发点大量分布的优点。 |
| 9. | The source-initiation unit in the case of an explosive source is likely to be an electric blaster .
震源的起震装置，在爆炸震源的情况下，可能是一个爆炸机。 |
| 10. | The source of earthquake waves-the site beneath the surface where the disturbance originates-is known as the focus .
地震波源--地表底下产生扰动的地方--称为震源。 |
