These seismic traces show the vertical vibration of the earth at Oahu (blue), OSN-1 (red), and southern California (green) caused by a magnitude 6.1 earthquake in Afghanistan on February 4, 1998. The earthquake event is the large amplitude arrival occurring in the middle of the traces. The left half of each trace shows the ambient noise prior to the event. In this figure the response at the OSN-1 observatory is better than at Oahu and comparable to Southern California.
[back]
|
