Research on the Seismotectonic Zones and Seismicity State in the Southern Xinjiang Region
【摘要】：Based on the studies of earthquake activity, tectonic movement, crustal shortening rate, fault activity, local stress field and historical characteristics of strong earthquake activities in Xinjiang, we divide the south part of Xinjiang into 4 seismotectonic zones, namely, the eastern segment of south Tianshan seismic belt, the Kalpin block, the Kashi-Wuqia junction zone, and the west Kunlun Mountains seismic belt. Using earthquake catalogues from Xinjiang since 1900, and on the basis of integrity analysis of earthquake records in different magnitude ranges, the seismicity state of different seismotectonic zones is analyzed quantificationally by calculating the mean value of annual strain energy release, annual rate of earthquakes with different lower limits of magnitude, b-value, and the parameter m of accelerating strain release model. The characteristic indexes of seismicity state for each of the seismic tectonic zones are then determined, which provide a quantitative basis for earthquake tendency analysis and judgment.
【基金】：supported by the Special Scientific Research Funds for Earthquake Studies, entitled “Development of Dynamic Evaluation System of Seismicity State in the Chinese Continent (Grant No. 200708020)”
INTRODUCTION As one of the seismically most active regions in the Chinese continent,the Xinjiang region extends nearly 2000km from north to south and more than 2000km from west to east,traversing three mountains and basins and almost the whole Tianshan e