It has been an especially active week for powerful Pacific earthquakes. On Tuesday, an undersea earthquake caused a tsunami that struck the Samoa islands region, resulting in scores of deaths. Another earthquake hit Indonesia Wednesday morning, causing buildings to topple.

Here are a list of resources to help you better understand, and cover, these natural disasters:

According to the U.S. Geological Survey, 455 people worldwide had died up until last week as a result of 2009 earthquakes.