Figure 1

Locations of the earthquake epicenters, beach ball diagrams showing the four-fault mechanisms, and vertical surface displacement. (a) Locations of epicenters during the main shock (red star) and aftershock (yellow star). Locations of GPS receiver stations used in the present study are also shown in the plot. Red triangles show the IGS GPS receiver stations, while green triangles represent the SuGAr GPS receiver stations. (b) Four-fault mechanisms during the main shock that lasted approximately 160 s. The parameters used to plot the fault mechanisms are from Yue et al. (2012) and are shown here in the table below the plot. It is clear that the main shock occurred with a mixture of strike-slip and thrust faulting. (c) Vertical surface displacement associated with the main shock. It can be seen that because of the small thrust component, a significant vertical displacement of approximately 2.27 m was observed near the epicenter during the main shock.