如何表达“××级地震”

据报道，所罗门群岛当地时间2007年4月2日早晨发生里氏7.6级地震，由此引发的海啸袭击了该国西部一些岛屿。

请看外电相关报道：A powerfulmagnitude-7.6 earthquakestruck off the Solomon Islands on Monday, sending a tsunami¹ wave crashing into the country's west coast and prompting region-wide disaster warnings.

Sgt. Godfrey Abiah said police in the capital, Honiara, reported a wave several yards high had crashed ashore² in the western town of Gizo shortly before communication lines with the region were cut.

报道中的“magnitude-7.6 earthquake”就是“7.6级地震”，“magnitude”在此表示“震级”。相应的，“××级地震”一般都表达为“a magnitude ×× earthquake”。

此外，报道中的“tsunami”指的是“海啸”。

最后，顺便再提两个与地震有关的词：epicenter（震中）；aftershock（余震）。