GET JSONP

Need help loading data when the URL contains the callback

myURL = 'http://comcat.cr.usgs.gov/fdsnws/event/1/query?starttime=2014-10-01%2000:00:00&minmagnitude=6&format=geojson&callback=eqfeed_callback&endtime=2014-10-31%2023:59:59&orderby=time';

$.ajax({
   type: 'GET',
    url: myURL,
    async: false,
    jsonpCallback: 'eqfeed_callback',
    contentType: "application/json",
    dataType: 'jsonp',
    success: function(data) {
       console.log(data.features.properties.mag);
    },
    error: function(e) {
       console.log(e.message);
    }
});

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lvmllcAsked:
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leakim971PluritechnicianCommented:
test page : http://jsfiddle.net/8ujqLy4v/

function eqfeed_callback(data) {
    for(var i=0;i<data.features.length;i++) {
       alert(data.features[i].properties.mag);
    }
};
var myURL = 'http://comcat.cr.usgs.gov/fdsnws/event/1/query?starttime=2014-10-01%2000:00:00&minmagnitude=6&format=geojson&callback=eqfeed_callback&endtime=2014-10-31%2023:59:59&orderby=time';

var s = document.createElement("script");
s.type = "text/javascript";
s.src = myURL;
document.head.appendChild(s);

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lvmllcAuthor Commented:
So if it works to build this with jQuery, why is it that when copying the URL to a script tag in the head from the start it fails?
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leakim971PluritechnicianCommented:
not sure you got it.
without jQuery it work (my test page)
using jQuery.ajax, jQuery.getJSON, jQuery.getScrip or any other jQuery fail
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lvmllcAuthor Commented:
Sorry for not getting back to this sooner.
Just confirming if the result had been a simple file of data starting out with  eqfeed_callback({"type":"FeatureCollection","metadata" ...  then I could have just used a <script src="myscripts.js"></script>  in the head. But since this is a call to a file that is being generated I need the let the script know to read the result as JavaScript - thus    s.type = "text/javascript";
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