**2. Several types of data used in our work**

The catalog data: We retrieved the catalog of earthquakes with magnitude ≥ 4, which occurred between 2007-0101 and 2022-0220 in the *M*<sup>W</sup> 7.9 source region and its vicinity from IRIS (the Incorporated Research Institutions for Seismology), and made up a computer program to process the catalog for plotting various hypocenter distribution figures. The data duration covers about seven and a half years before and after the occurrence of the mainshock.

*Studies on the Source Parameters of the 23 June 2014 Rat Islands, Alaska… DOI: http://dx.doi.org/10.5772/intechopen.104600*

Seismogram data: When we perform a moment tensor inversion, and model source rupture process for an earthquake, we need waveform records. Usually, we retrieve waveform records from IRIS. For this *M*<sup>W</sup> 7**.**9 earthquake:


An earth velocity model is required for relocations of the aftershocks. We used the velocity model provided by Macpherson and Ruppert [2], to replace the crustal part in the Preliminary Reference Earth Model (PREM; [8]). This revised model was used for aftershock relocations and the source rupture modeling.
