The aftershock data of 26th July 2003 earthquake of M6.2 at the northern Miyagi-Ken Japan.
main2003JUL26 is a data frame with 2305 observations and 9 variables
named no., longitude, latitude, magnitude, time (from the main shock in days), depth, year, month, and day.
Ogata, Y. (2006) Computer Science Monographs, No.33, Statistical Analysis of Seismicity - updated version (SASeies2006). The Institute of Statistical Mathematics.
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