Select a format below to download the complete technical data for this earthquake, including complete earthquake parameters in QuakeML (XML) format; Shaking Layers data products for earthquakes magnitude 3.5 and above, available in GeoTIFF, Shapefile, JSON, and other supported formats; Strong Motion summary ground acceleration and velocity data in JSON format (via the GeoNet API) for earthquakes magnitude 4.0 and above; and the complete set of Strong Motion data products for earthquakes magnitude 4.0 and above.
Calculated source location of the earthquake. It contains the parameters GeoNet's location software derived from seismic station observations.
| PublicID | 3060037 |
| UTC Time | 2009-03-15T18:08:30Z |
| Latitude | -30.28 (± 0.0 km) |
| Longitude | -177.77 (± 0.0 km) |
| Depth | 43 km (± 0 km) |
| Depth Type | operator assigned |
| Earth Model | nz1dr |
| Used Phase Count | 3 |
| Used Station Count | 3 |
| Standard Error | 0.10 (s) |
| Azimuthal Gap | 327.00 (degrees) |
| Minimum Distance | 7.96 (degrees) |
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.
| Type | Magnitude | Station Count |
|---|---|---|
| Preferred (Mw) | 5.1 | |
| Mw | 5.1 | 0 |
| Mb | 5.1 | 0 |
| Minimum distance | 7.96 (degree) |
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).
Observed arrival time at a seismic station compared to a predicted arrival time from a GeoNet waveform propagation model (a given velocity model (1D or 3D)). A residual of 0 s indicates that the observed seismic phase arrival time (typically P or S) matches the arrival time predicted by the GeoNet velocity model. Low residuals across multiple well-distributed stations increase confidence in the estimated event location and origin time. Large (brown) points are used to determine the current solution, small (grey) points are observations not used.
