Remote Sensing of Atmospheric CO and O₃ Anomalies before and after Two Yutian M_S7.3 Earthquakes

Figure 4

Spatial distribution of CO concentration anomalies before and after the Yutian earthquake on February 12, 2014. 1—Peru fracture; 2—Ashe Cooley-Xiaoerkule fracture; 3—Kangxiwa fracture; 4—Kuyake fracture; 5—Guozhacuo fracture; 6—Longmucuo-Bangdacuo fracture; 7—Margai Caka fracture; 8—Gonggacuo fracture; and 9—Arerjin fracture. Red five-pointed star indicates the epicenter location.

(a) Spatial distribution map of CO anomalies obtained by the difference method

(b) Spatial distribution map of CO anomalies obtained by the anomaly index method