对多数地区，等震线略具狭长的形状，经验点椭圆模型可以减小点源模型和断层破裂模型的系统偏差。
For most of the regions, isoseismals are of somewhat elongated shape. The empirical point-ellipse model can reduce systematic deviation of point-source and fault-rupture models.
有时它更圆一点，有时它更像椭圆。
Sometimes it is a little more circular, sometimes it is more elliptical.
它可能只是整个平面的一部分，奇怪一点的话，它可能是椭圆形的，也可能是三角形的或是其他什么形状。
It could be a small piece of it. It could even be, to trick you, maybe an ellipse in there or a triangle in there or something like that.
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