2014 年新疆于田MS 7. 3 地震矩心矩张量快速测定

Rapid determination of the centroid moment tensor to the 2014 Yutian MS7. 3 earthquake，Xinjiang

摘要:

基于中国大陆中强震自动矩张量测定系统，采用虚拟中国地震台网记录的近震波形(震中距4° ～ 12°)，反演了新疆于田MS7. 3 地震的矩心矩张量。结果显示，地震发震断层面参数分别为走向243° /倾角70° /滑动角－ 18°，表现为1 次左旋走滑为主兼有少量正倾滑分量的事件。矩心在水平方向上位于震中(36. 123°N，82. 499°E)以东约13 km，矩心深度约10 km。总标量地震矩M0为3. 05 × 1019N·m，换算成矩震级MW6. 92，推断震源破裂时大部分能量释放的持续时间约14s。同时探讨了自动矩张量测定系统在未来地震灾情预判中的重要作用。

Abstract:

The authors successfully employ an automatic centroid moment tensor inversion system to infer the centoid moment tensors of the Yutian MS 7. 3 earthquakes，Xinjiang using regional seismic waveforms (4° ＜ Δ ＜ 12°) observed by the virtual China Seismic Networks，which has been recently set up． The results indicate that this event occurred on a rupture plane ( strike 243°，dip 70°，and rake － 18°)，showing a left-lateral strike-slip mechanism with minor normalfaulting component． The centroid in the horizontal direction is located at nearly 13km east of the epicenter (36. 123°N，82. 499°E)，and the best-fitting centroid depth is round 10km． The total scalar moment，M0，is retrieved with an average value of 3. 05 × 1019N·m (or moment magnitude MW6. 92)． Most of the energy is released within about 14s． Moreover，we discuss about the future application of the automatic centroid moment tensor inversion system in earthquake disaster decision．