前程百利小编为考生带来了与地震发生预测相关的托福阅读材料。地震、火山爆发等自然现象是托福阅读中会涉及的话题，在以往的托福阅读真题中，曾经有考生回忆过关于地震波的文章。所以希望本文会对大家有所帮助。
(一)
Earthquakes are a common geological phenomenon; they happen all over the world every single day. However most of the earthquakes are too weak for humans to feel. Since the dawn of time man has sought to forecast earthquakes due to the possibility of their devastating effects. Even though earthquakes cannot be forecasted or predicted with 100 percent certainty there are some things that you can do to help forecast earthquakes.
Look at geologic maps to find the locations of past earthquakes. Maps showing the locations of past earthquakes are available from the United States Geological Survey (USGS). By looking at these maps you can see where earthquakes may be likely to occur again based on where they have occurred in the past.
Obtain information on when earthquakes have occurred in the past. In some locations that have experienced multiple earthquakes in the past there may be some periodicity or pattern to when those earthquakes occurred. Knowing this periodicity can help you forecast when an earthquake may occur in the future. The USGS also has information on when earthquakes have occurred.
(二)
Examine seismograms tracings or recordings of seismic activity at a particular location. If you see an increase in seismic activity on a seismogram a large earthquake may soon follow.
Observe rocks in various areas. Sometimes rocks will contain layers of disturbed sediments that indicate ancient severe earthquakes. Knowing the locations of these past severe earthquakes can indicate that future severe earthquakes may occur in these same areas.
Take note of foreshocks. Sometimes large earthquakes are preceeded by smaller earthquakes known as foreshocks. If small earthquakes are occuring in a particular area over a particular period of time then a larger more severe earthquake may be forecasted for that area.
Look at the behavior of animals. Although highly controversial some animals such as dogs and cats may change their behavior patterns prior to an earthquake.
Think about tidal forces. Tidal forces as predictors of future earthquakes is an unproven theory. The phenomenon known as syzygy says that tidal patterns can be used to forecast earthquakes especially those involving oceanic crust.
以上就是前程百利小编为大家带来的托福阅读材料，平时的阅读练习是托福考试阅读备考的重要一环。希望大家利用好每份材料，尽可能多地从中获取知识。预祝大家托福考试取得好成绩。
