This map renders the data as a Heatmap.
Query for map plugin:
select round(lat,3), round(lng,3), sum(10*(mag+1))
group by round(lat,3), round(lng,3)
Adding the SUM() and GROUP BY helps to reduce the volume of data sent to the client. For a heatmap, sending 5 rows with the same position and weight "1" is the same as sending a single row with weight "5".