Based on the comment in 24545, I have modified the round method for GRD-PEM_EARTHQUAKE. A new key is added in the segment dictionary in the beginning of the code.
Modified codes are uploaded on the github.
https://github.com/gw-detchar/tools/blob/master/Segments/Script/make15minSegment_igwn2.py
https://github.com/gw-detchar/tools/blob/master/Segments/Script/make24hourSegment_v2.py