The Minimum Magnitude must be 1.0 or greater. Depth Setting the depth range is optional. To retrieve all depths, set the Minimum and Maximum Depth values to zero or leave these fields blank. Depth is measured in kilometers. Not all earthquakes have depths associated with them.
Intensity Setting the intensity range is optional.
To retrieve all intensities, set the Minimum and Maximum Intensity values to 0 or leave the fields blank. Intensity values range from 1 to 12. Most earthquakes do NOT have intensity values associated with them. The Rectangular Area Search selects earthquakes that are located within a defined rectangular grid. Top and Bottom Latitude and Right and Left Longitude must be set if the Rectangular Area was selected for the Search Area.