| PublicID | 1221077 |
| UTC Time | 1998-04-20T23:34:18Z |
| Latitude | -39.02 (± 0.0 km) |
| Longitude | 174.92 (± 0.0 km) |
| Depth | 232 km (± 2 km) |
| Depth Type | free |
| Earth Model | nz1dr |
| Used Phase Count | 59 |
| Used Station Count | 55 |
| Standard Error | 0.19 (s) |
| Azimuthal Gap | 94.00 (degrees) |
| Minimum Distance | 0.36 (degrees) |
| Type | Magnitude | Station Count |
| Preferred (ML) | 6.7 (± 0.5) | |
| ML | 6.7 (± 0.5) | 6 |
GeoNet combines magnitudes into a summary magnitude, M, which consists of a weighted average of the individual magnitudes and attempts to be a best possible compromise between all magnitudes for a range of earthquake sizes.
Summary magnitude for GeoNet is then defined as:
M = (2 * MLv + (0.4 * number_of stations(Mw(mB)) - 1) * Mw(mB)) / (2 + (0.4 * number_of_stations(Mw(mB)) - 1))
Where MLv is local magnitude calculated on the vertical component and Mw(mB) is a Mw estimation based of mB by Bormann and Saul (2008).
Map showing stations with picks used to locate the earthquake. Stations with picks that have a zero weight in the solution are shown as small grey circles. Those with a higher weight are shown as larger circles. The quake is shown by the largest circle.