File:How-the-Richter-Magnitude-Scale-is-determined.jpg - Wikipedia

6.3 Measuring Earthquakes – Environmental Geology

Richter scale - Wikipedia

A global multiproxy database for temperature reconstructions of the Common Era

File:How-the-Richter-Magnitude-Scale-is-determined.jpg - Wikipedia

Earthquake - Wikipedia

Earthquake - Wikipedia

Richter Scale & Magnitude

richter_scale.gif U.S. Geological Survey

Earthquake Magnitude, Energy Release, and Shaking Intensity

Happy Richter Scale Day! (Enjoy with an Inventive $2.99 eBook!)