Help line : location by bisectors

Determination of the location of the area to the epicenter of the 'circle method'.
>> Examination of seismograms for the same event shows that the seismic waves P (first) came earlier than some other stations. We deduce that some stations are closer than others to the epicenter.

- It works on pairs of stations.
- Click for the couple of stations, first on the station that received the P wave first, then the other station.
>> The space is divided into two sectors by a bisector derived from the two stations. The shaded area is the area where the epicenter is not possible given the arrival times recorded at the stations.