|Abstract:Using waveforms recorded by about one hundred seismic stations of the China Seismic Network and the phase-based method of FOCMEC, we determined focal mechanisms for the Ms 5.0 earthquake occurred on November 23, 2017, in Wulong and the Ms 4.9 earthquake on December 27, 2016, in Rongchang. We also collected focal mechanisms for other earthquakes recently occurred in Chongqing. Our results show that the Wulong earthquake on southern Qiyaoshan fault is an oblique normal fault activity, similar to another earthquake recently occurred in Shizhu on central Qiyaoshan fault. We therefore infer that the Qiyaoshan fault is characterized by normal activities. The Rongchang earthquake on southern Huayingshan fault is a reverse fault activity with strike-slip component, similar to other earthquakes in the region. So, the (southern) Huayingshan fault is characterized by reverse activities. On a regional view of focal mechanism results, the western part of Chongqing where the Huayingshan fault is located is mainly controlled by tectonic stress in rough E-W direction, which is similar to the stress environment in the South China. The central and eastern part of Chongqing where the Qiyaoshan fault is located is mainly controlled by tectonic stress in rough S-N direction, which is similar to the stress environment in the area from Chongqing to Hubei-Hunan plain. However, the stress field is different with background (rough E-W) stress environment in South China. All those indicate that the areas from the central and eastern part of Chongqing to Hubei-Hunan plain are in a special dynamic environment. In fact, the areas are in the transition region between two global tectonic domains, Tethyan and circum-Pacific tectonic domains. The distinctive present stresses imply that the region from central and eastern Chongqing to Hubei-Hunan plain seems not to be affected by the two global tectonic domains in the present.