China, Conyi: 1977-2020

The Conyi cluster is named for Co Nyi County (Shuanghu in Chinese) in northern Tibet. It is based on data from a long linear seismic array deployed in the area in 1998-1999 which observed 5 earthquakes in the magnitude range 3.9-4.6 at distances as close as 25 km. The azimuthal coverage is weak but is partially offset by the large number of readings to achieve a reasonable level of location accuracy. Surface elevation in this region is ~5200 meters. The trade-off between focal depth, crustal velocity model and location was carefully explored with fixed-depth relocations. Free depth relocations are unstable. Depths of 0-3 km (5-8 km below the surface) fit the local distance arrival time data best. To improve the sampling at regional [...]