Indonesia had multiple major earthquakes this year

I'm aware that Indonesia sits in an earthquake zone, but historically I don't think so many big ones occur in such a close time. Also, this spread out in different islands (e.g. the epicentres in Java and Sulawesi are ~1,000 km apart) over several months, so it doesn't look (at least to me) like typical mainshock-aftershock relationship. Were they related in some way? e.g. Do they indicate an increase seismic activity in the region?


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