Abstract Based on about 30 years mobile cross-fault short leveling data for at the surroundings of Ordos block up to the end of 2016, we compute the vertical synthetic norm of grey relation degree, annual velocity and trend accumulation rate.We analyze the characteristics, level and time-space differences of the tectonic activities. Furthermore, we consider possible relationships with the gestation-occurrence and the influence of strong earthquakes inside the monitoring area and great earthquakes outside the monitoring area. The results showed that: (1) the characteristics of fault activity are basically consistent with the geological data; (2) anomalies are found inside and outside the study area before most earthquakes with magnitude over Ms5.8 and the Wenchuan great earthquake; (3) vertical tectonic activitiesare faster in the western Weihe basin and the northern Liupanshan tectonic region, while slower in the central Weihe basin, the Haiyuan fracture and the southern Liupanshan tectonic region. Long-term energy accumulation is relatively obvious in Shanxi fault belt and the northern west Qinling tectonic region. Both ends are relatively active, while the center locked from Liupanshan tectonic region to the western Weihe basin, particularly in recent years.
ZHANG Xi,JIA Peng,ZHANG Sixin et al. Study on the Characteristics of Tectonic Activities and Strain Accumulation at the Surroundings of Ordos Block[J]. jgg, 2018, 38(4): 331-337.
ZHANG Xi,JIA Peng,ZHANG Sixin et al. Study on the Characteristics of Tectonic Activities and Strain Accumulation at the Surroundings of Ordos Block[J]. jgg, 2018, 38(4): 331-337.