The 1931 Hawke’s Bay earthquake caused the largest loss of life and most extensive damage of any quake in New Zealand’s recorded history.
| PublicID | 2178228 |
| UTC Time | 1931-02-02T22:47:00Z |
| Latitude | -39.30 (± 0.0 km) |
| Longitude | 177.00 (± 0.0 km) |
| Depth | 20 km (± 0 km) |
| Depth Type | operator assigned |
| Earth Model | |
| Used Phase Count | 0 |
| Used Station Count | 0 |
| Standard Error | 0.00 (s) |
| Azimuthal Gap | 0.00 (degrees) |
| Minimum Distance | 0.00 (degrees) |
| Type | Magnitude | Station Count |
| Preferred (Mw) | 7.4 | |
| Mw | 7.4 | 0 |
| MS | 7.8 | 0 |
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.