In order to use the website and be able to upload your data, you have to format your input file in this way (using commas between the fields): longitude,latitude,altitude (or empty field),magnitude. Besides, it has to be a txt or a csv file.
This website tool has been developed by Dr. Carlo Grillenzoni
and Dr. Diego Migliavacca
This code implements a Graphical User Interface for mean-shift clustering algorithms (simple, blurred and truncated), with data-driven selection of the optimal bandwidth. It can handle and cluster both digital images and data tables (csv).
Methods and technical details are described in the paper.
Reference: Design of Blurred Mean-Shift Algorithms for Data Classification Journal of Classification
More infos here