Abstract In this paper, the anomalies of fault deformation before the Aug. 8th, 2017 Jiuzhaigou MS7.0 earthquake, and their variations after the quake, are analyzed. We use the data of across-fault short-leveling at the northeastern margin of Qinghai-Xizang block, together with added data observed in August and September after the quake, with the aid of observational curves and time-space evolution of the anomalies, as well as the index of feature intensity. The results show that: Over one year before the earthquake, the anomalies are relatively concentrated at the area from western Qinling to Liupanshan tectonic region; 1-3 months before the earthquake, short-term anomalies at the western Qinling tectonic region and nearby display an increasing trend within the distance of 300 km of the epicenter; this mainly reveals abrupt thrust change characteristics, which have medium-short-term and short-term precursory features; one month after this earthquake, most anomalies had adjusted and recovered.
ZHANG Xi,JIA Peng,LI Ruisha et al. Precursory Anomalies of Across-Fault Leveling before the Jiuzhaigou MS7.0 Earthquake and Variation after the Quake[J]. jgg, 2018, 38(11): 1101-1106.
ZHANG Xi,JIA Peng,LI Ruisha et al. Precursory Anomalies of Across-Fault Leveling before the Jiuzhaigou MS7.0 Earthquake and Variation after the Quake[J]. jgg, 2018, 38(11): 1101-1106.
