There are three major points that should be clarified before further evaluation of this submission. 

1. Line 200. How are·the probabilities of seismic hazard obtained? I checked Wu et al. 2020, but did not think that the details had been given in it. 
2. How are the aftershocks simulated? 
3. How is the ETAS model, given in Section 2.2, used in the evaluation?

Other:

1. Line 150. Is EM algorithm necessary? How are p, c, k estimated?

This paper deals with an important problem of PSHA: the inclusion of aftershocks in PSHA calculations.

The obtained results are interesting, and the methodology seems appropriate for the problem.

However, the Discussion part of the paper is quite short and poor. The authors must highlight both the assumptions made and the possible weaknesses of their approach, and then compare their procedure with other methods applied in other papers. There are also some important papers on this topic published in the last 2-3 years missing in the reference list.

Since the Discussion part is fundamental in any scientific study, and this section here is not well organized/structured, I suggest a major revision for this work.

I also attached a pdf file with some comments to improve the work.

This study has evaluated the effect of considering aftershocks in PSHA analysis, which is an important issue for the seismological community.

The manuscript is concise, easy-to-follow, and well structured. The results are interesting, but I have some objections on the methodology. Furthermore, some of the assumptions made by the authors should be more thoroughly explained. Also, the final section is very short, but I think these results deserve a more detailed Discussion section (e.g., to highlight the strengths and the limitations of the proposed approach, to benchmark the results against other methods such as the simulation of ETAS catalogs, to give a better outlook on future developments etc.) Finally, I suggest some very minor adjustments to the figures.

I think the manuscript could be considered for publication by the editorial office following the major revisions as listed in the attached PDF file.