data(jap.quakes)"data.frame" containing the following columns:
date
Occurrence date in the format "yyyy/mm/dd"
time
Occurrence time in decimal days after the first earquake
long
Latitude of epicenter in decimal degrees
lat
Latitude of epicenter in decimal degrees
mag
Magnitude of each earthquake by JMA (Japan Meteorological Agency)
depth
Depth of each earthquake
Di Giacomo, D., Harris, J., Villasenor, A., Storchak, D. A., Engdahl, E. R., Lee, W. H., & Team, D. E. (2015). ISC-GEM: Global Instrumental Earthquake Catalogue (1900-2009), I. Data collection from early instrumental seismological bulletins. Physics of the Earth and Planetary Interiors, 239, 14-24.