It's not clear why the alarm was sounded in Tokyo because the missile's flightpath was much further north.
目前还不清楚为什么东京会拉响警报,因为导弹的飞行路线要靠北得多。
英语百科
Trajectory
A trajectory or flight path is the path that a moving object follows through space as a function of time. The object might be a projectile or a satellite. For example. It can be an orbit—the path of a planet, an asteroid or a comet as it travels around a central mass. A trajectory can be described mathematically either by the geometry of the path, or as the position of the object over time.