diff --git a/examples/heatmap-earthquakes.html b/examples/heatmap-earthquakes.html
index 1f6a294198..d6ec6f8899 100644
--- a/examples/heatmap-earthquakes.html
+++ b/examples/heatmap-earthquakes.html
@@ -29,7 +29,7 @@
 
       <div class="row-fluid">
 
-        <div class="span12">
+        <div class="span8">
           <h4 id="title">Earthquakes heatmap</h4>
           <p id="shortdesc">Demonstrates the use of a heatmap layer.</p>
           <div id="docs">
@@ -40,8 +40,15 @@
           </div>
           <div id="tags">heatmap, kml, vector, style</div>
         </div>
-      </div>
 
+        <div class="span4">
+          <form>
+            <label>radius size</label>
+            <input id="radius" type="range" min="1" max="50" step="1" value="5"/>
+          </form>
+        </div>
+
+      </div>
     </div>
 
     <script src="../resources/jquery.min.js" type="text/javascript"></script>
diff --git a/examples/heatmap-earthquakes.js b/examples/heatmap-earthquakes.js
index e28ce927b1..0e41408931 100644
--- a/examples/heatmap-earthquakes.js
+++ b/examples/heatmap-earthquakes.js
@@ -5,6 +5,7 @@ goog.require('ol.layer.Tile');
 goog.require('ol.source.KML');
 goog.require('ol.source.Stamen');
 
+var radius = $('#radius');
 
 var vector = new ol.layer.Heatmap({
   source: new ol.source.KML({
@@ -12,7 +13,7 @@ var vector = new ol.layer.Heatmap({
     projection: 'EPSG:3857',
     url: 'data/kml/2012_Earthquakes_Mag5.kml'
   }),
-  radius: 5
+  radius: parseInt(radius.val(), 10)
 });
 
 vector.getSource().on('addfeature', function(event) {
@@ -38,3 +39,8 @@ var map = new ol.Map({
     zoom: 2
   })
 });
+
+
+radius.on('input', function() {
+  vector.setRadius(parseInt(radius.val(), 10));
+});