data(quakes)
| [,1] | lat | numeric | Latitude of event |
| [,2] | long | numeric | Longitude |
| [,3] | depth | numeric | Depth (km) |
| [,4] | mag | numeric | Richter Magnitude |
| [,5] | stations | numeric | Number of stations reporting |
There are two clear planes of seismic activity. One is a major plate junction; the other is a trench off New Zealand. These data constitute a subsample from a larger dataset of containing 5000 observations.