1.媒体来源:
CNN
2.完整新闻标题:
How earthquakes are measured
地震是怎么样量测的？
3.完整新闻内文:
Earthquakes are measured using seismographs, which monitor the seismic waves
that travel through the Earth after an earthquake strikes.
地震是使用地震仪量测的。它是一种可以监测地震震波的仪器。
Scientists used the Richter Scale for many years but now largely follow the
"moment magnitude scale," which the U.S. Geological Survey says is a more
accurate measure of size.
科学家们以前都是使用芮氏地震规模当作标准，而且行之有年。
但是根据美国地质调查局表示，现在应该要使用更精确的“地震矩规模”。
也有人翻作“地震等级”、“地震震级”等。
Here are the magnitude classes:
下面这些是地震的分类：
Microearthquake: