为什么我国测定的地震等级与美国不同
问题描述：
为什么我国测定的地震等级与美国不同
我国测定的是8级,而美国测定的是7.
cnn原文On the afternoon of May 12,2008,an earthquake measuring 7.9 on the Richter scale hit Sichuan Province,a mountainous region in Western China.By the next day,the death toll stood at 12,000,with another 18,000 still missing.Over 15 million people live in the affected area,including almost 4 million in the city of Chengdu.Nearly 2,000 of the dead were students and teachers caught in schools that collapsed.
答
传到那边就小了,即使是专业的测量,能量也会有损失