This earthquake followed the magnitude 6.5 Cook Strait earthquake on 21st July. It caused damage to buildings on both sides of Cook Strait.
| PublicID | 2013p613797 |
| UTC Time | 2013-08-16T02:31:05Z |
| Latitude | -41.70 (± 2.1 km) |
| Longitude | 174.16 (± 2.2 km) |
| Depth | 7 km (± 3 km) |
| Depth Type | free |
| Earth Model | nz3drx |
| Used Phase Count | 40 |
| Used Station Count | 37 |
| Standard Error | 0.52 (s) |
| Azimuthal Gap | 64.71 (degrees) |
| Minimum Distance | 0.06 (degrees) |
| Type | Magnitude | Station Count |
| Preferred (M) | 6.5 | |
| MLv | 6.5 (± 0.3) | 30 |
| ML | 6.5 (± 0.3) | 11 |
| M | 6.5 | 30 |
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.