ude</code></dt><dd><p>a numeric vector giving the decimal degrees longitude. Negative values for western longitudes</p></dd>
<dt><code>depth</code></dt><dd><p>Depth of the event in kilometers</p></dd>
<dt><code>mag</code></dt><dd><p>The magnitude for the event</p></dd>
<dt><code>place</code></dt><dd><p>a factor giving a textual description of named geographic region near to the event.</p></dd>
<dt><code>type</code></dt><dd><p>a factor with levels <code>earthquake</code> <code>mining explosion</code> <code>r