Earthquake Location Information


Events in GeoNet's catalogue from 2012 are determined using the SeisComP earthquake analysis system. It features two location techniques, LocSAT and NonLinLoc. Since 2023 GeoNet upgraded seiscomp3 to later versions now using a generic "SeisComP" name

SeisComP is seismological software for data acquisition, processing, distribution and interactive analysis. As part of its origin location functionality, it employs two locations techniques:


SeisComP can produce many of the standard estimates of magnitude type. GeoNet combines these into a summary magnitude, denoted M, which consists of a weighted average of the individual network magnitude types and attempts to be a best possible compromise between all magnitude types for a range of earthquake sizes and distances. Currently we only use two magnitude estimates:

Summary magnitude for GeoNet is then defined as:

$$M = \frac{2 * M_{Lv} + (0.4 * number\_of\_stations(M_{w(mB)}) - 1) * M_{w(mB)}}{2 + (0.4 *number\_of\_stations(M_{w(mB)}) - 1)}$$