China, Haicheng: 1975-2017

The Haicheng cluster is named for the city of Haicheng in Liaoning Province, northeastern China. The cluster is based on the Ms 7.5 earthquake of February 4, 1975. Arrival time data is sparse for this cluster, limiting it to 34 earthquakes. Only 13 of the events have readings within the 1.2° epicentral distance range chosen for estimation of the hypocentroid but the location calibration is reasonably good. Some events have depth constraint from teleseismic depth phases, but almost half the events are fixed at the default depth of 15 km, the median depth of the events which do have depth control. Number of events: [...]