When the instrument is situated at more than 700 miles from the earthquakecentre.
如果把这种仪器安装在距震源700多英里远的地方。
2
"A significant tsunami was generated by this earthquake," said the Pacific tsunami warning Centre. The tsunami warning was later withdrawn after the danger of further waves had passed.
太平洋海啸预警中心：这次强烈的海啸是由地震引发的，地震波危险期过后，海啸预警随后就取消了。
3
In late 2005 the centre coordinated the international medical response to Hurricane Katrina and to the earthquake in Pakistan.