The Zhaotong cluster is named for the city of Zhaotong in the northeast
corner of Yunnan Province, China. The cluster includes events in
neighboring Guizhou and Sichuan Provinces. The cluster includes one
larger event, a 6.2 Mw earthquake on August 3, 2014. Almost all the
local observations that are used for location calibration are from a
dataset of observations from provincial seismograph networks that was
assembled by Sun Ruomei. The distribution of stations is very good and
the location calibration is very robust. All events have depth
constraint, mainly from near-source and local-distance observations, and
some events are constrained by teleseismic depth phases.
