GMT 是一款与地球物理学联系紧密的绘图软件，它可以在地图上绘制地震，断 层，画等值线，地形图，还可以进行简单数字运算，甚至谱分析等- GMT is a close contact with geophysics mapping software, it can draw an earthquake on the map, broken Layer, draw contour lines, topographic maps, but also can be a simple numb