Earthquake {nlme} | R Documentation

## Earthquake Intensity

### Description

The `Earthquake` data frame has 182 rows and 5 columns.

### Format

This data frame contains the following columns:

Quake

  an ordered factor with levels `20` < `16` < `14` < `10` < `3` < `8` < `23` < `22` < `6` < `13` < `7` < `21` < `18` < `15` < `4` < `12` < `19` < `5` < `9` < `1` < `2` < `17` < `11` indicating the earthquake on which the measurements were made.

Richter

  a numeric vector giving the intensity of the earthquake on the Richter scale.

distance

  the distance from the seismological measuring station to the epicenter of the earthquake (km).

soil

  a factor with levels `0` and `1` giving the soil condition at the measuring station, either soil or rock.

accel

  maximum horizontal acceleration observed (g).

### Details

Measurements recorded at available seismometer locations for 23 large earthquakes in western North America between 1940 and 1980. They were originally given in Joyner and Boore (1981); are mentioned in Brillinger (1987); and are analyzed in Davidian and Giltinan (1995).

### Source

Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S and S-PLUS, Springer, New York. (Appendix A.8)

Davidian, M. and Giltinan, D. M. (1995), Nonlinear Models for Repeated Measurement Data, Chapman and Hall, London.

Joyner and Boore (1981), Peak horizontal acceleration and velocity from strong-motion records including records from the 1979 Imperial Valley, California, earthquake, Bulletin of the Seismological Society of America, 71, 2011-2038.

Brillinger, D. (1987), Comment on a paper by C. R. Rao, Statistical Science, 2, 448-450.

[Package nlme version 3.1-131 Index]