青藏高原北部地区7级以上地震前地震活动特征

SEISMIC ACTIVITY BEFORE EARTHQUAKE WITH M_S≥ 7. 0 IN NORTHERN AREA OF TIBET PLATEA^U

发现青藏高原北部7级以上地震前震中区普遍存在5级以上地震空段,空段时间在7~33年之间,且在青海发生的7级以上地震前震中区还存在ML≥4.0级地震空区,四川北部的7级以上地震前弱震活动出现显著增强现象。未来2~8年间青藏高原北部有可能发生7级以上地震,其危险区域为祁连地震带西部、甘肃东南部、宁夏和内蒙西部。

In this paper, there have existed earthquake deficiencies larger than 5 magnitude before earthquakes with MS≥7.0 near the epicenters in northern area of Tibet Plateau, deficiency time on 7-33 years; And there still have existed gaps of earthquakes with ML≥4.0 before earthquakes with MS≥7.0 near the epicenters in Qinghai, there have exists rising of weak earthquake activity level before earthquakes with MS≥7.0 near the epicenters in Sichuan. The future 2.0 - 8.0 years in northern area of Tibet Plateau earthquakes with MS≥7.0 are likely to happen, and their dangerous area for Qilian seismic zone in the west, the southeast of Gansu, Ningxia and Inner Mongolia west.