**6.2 Evaluation of earthquake detection**

To evaluate the performance of earthquake detection and earthquake epicenter location estimation, one must collect earthquake data from some organizations. Those data must include information about an approximate time point of an earthquake and approximate position of an earthquake epicenter. Moreover, it is better that they include the exact time of an earthquake, the longitude and latitude of an earthquake epicenter, and the seismic intensity of earthquakes in each region.

For example, the Japan Meteorology Agency (JMA) publishes an earthquake database on the Web, which includes a time, magnitude, and earthquake intensities at each point of area, a place of earthquake epicenter of all earthquakes above level 1 on the Japanese seismic intensity scale5. The USGS publishes similar data on the Web6.

Data of such kinds can be obtained by crawling. They can be used to create training data for classifiers and to evaluate the performance an earthquake detection system.
