The Bigadiç cluster is named for the town of Bigadiç in Balıkesir
Province, western Turkey. The cluster is formed around a 6.1 Mw
earthquake on August 10, 2025 which was followed on October 27, 2025 by
a 6.0 Mw event about 13 km to the southeast. The cluster also includes
the 5.9 Ms Demirci earthquake on March 23, 1969. The station
distribution in the region is very dense and the location calibration is
very robust. All events have depth control from near-source and
local-distance readings, teleseismic depth phases or waveform analysis.
