Fig. 3

Spatiotemporal distribution of microseismic events. a Results for Mqs1 and 2. The solid and dashed lines show diffusion curves for Mqs1 and 2; b results for Mqs3 with a diffusion curve. Groups 1 and 2 correspond to the groups of microseismic events shown in Fig. 4d. The horizontal axis shows days from the start of injection; the vertical axis shows distance from the initial point; c temporal relationship between Mqs2 and pressure change rate at the bottom of the Test Well. The black line shows the pressure change rate (left vertical axis), and the circles show the spatiotemporal distribution of the microseismic events (right vertical axis). The length of the shaded areas is 7 days. Gray line represents injection rate in Fig. 1a