Datasets

quakes

Locations of Earthquakes off Fiji
Description
The data set give the locations of 1000 seismic events of MB > 4.0. The events occurred in a cube near Fiji since 1964.

Format
A data frame with 1000 observations on 5 variables.

[,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
Details
There are two clear planes of seismic activity. One is a major plate junction; the other is the Tonga trench off New Zealand. These data constitute a subsample from a larger dataset of containing 5000 observations.

Source
This is one of the Harvard PRIM-H project data sets. They in turn obtained it from Dr. John Woodhouse, Dept. of Geophysics, Harvard University.

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faithful

Old Faithful Geyser Data
Description
Waiting time between eruptions and the duration of the eruption for the Old Faithful geyser in Yellowstone National Park, Wyoming, USA.

Format
A data frame with 272 observations on 2 variables.

[,1]    eruptions    numeric    Eruption time in mins
[,2]    waiting    numeric    Waiting time to next eruption (in mins)
Details
A closer look at faithful$eruptions reveals that these are heavily rounded times originally in seconds, where multiples of 5 are more frequent than expected under non-human measurement. For a better version of the eruption times, see the example below.

There are many versions of this dataset around: Azzalini and Bowman (1990) use a more complete version.

Source
W. Härdle.

References
Härdle, W. (1991). Smoothing Techniques with Implementation in S. New York: Springer.

Azzalini, A. and Bowman, A. W. (1990). A look at some data on the Old Faithful geyser. Applied Statistics, 39, 357–365. doi: 10.2307/2347385.

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rock

Measurements on Petroleum Rock Samples
Description
Measurements on 48 rock samples from a petroleum reservoir.

Format
A data frame with 48 rows and 4 numeric columns.

[,1]    area    area of pores space, in pixels out of 256 by 256
[,2]    peri    perimeter in pixels
[,3]    shape    perimeter/sqrt(area)
[,4]    perm    permeability in milli-Darcies
Details
Twelve core samples from petroleum reservoirs were sampled by 4 cross-sections. Each core sample was measured for permeability, and each cross-section has total area of pores, total perimeter of pores, and shape.

Source
Data from BP Research, image analysis by Ronit Katz, U. Oxford.