Figure
S3 . Examples of picking P -wave arrival times of a local
earthquake recorded at the GLISN stations. The waveforms are filtered
using a Butterworth filter with a frequency band of 1-10 Hz. The red
dots denote the picked P -wave arrival times; gray bars denote
theoretical arrival times calculated for the IASP91 model (Kennett &
Engdahl, 1991). The epicenter (red star) and seismic stations (blue
triangles) are shown on the inset map.