Figure 1
(a) Map of the study region. Portable and permanent seismic stations are marked with blue and black triangles, respectively. The yellow area is the surface projection of the Hutubi underground gas storage (UGS) facility. The blue rectangle encompasses the study area. The pink and red cycles show the earthquakes reported by the China Earthquake Networks Center and the relocated template events, respectively. The blue lines show the major faults in the region. (b) Detailed representation of the area around the Hutubi UGS, corresponding to the dashed rectangle in (a). The blue and red triangles are portable seismic stations and injection wells, respectively. (c) The cumulative number of earthquakes versus magnitude is fit to the Gutenberg-Richter relation to estimate the MC and the b-value. (The elevation data is the 90 m topography from the Shuttle Radar Topography Mission31, this figure was created with the Generic Mapping Tools (GMT) 5.4.4, URL: www.generic-mapping-tools.org).
