Figure 3

Focal mechanism analysis results. (a) Focal mechanism solutions for the earthquakes that occur along the Baribis Faults; two from Damanik et al.¹⁸ (event no. 1–2, squares) and eight from this study (event no. 3–10, dots). (b) Example of three-component waveform inversions at stations BAR08, BAR10, BAR11, BAR12, and BAR13 for event no. 4 in (a) that occurred on 11 February 2021. Black and red waveforms are observed and synthetic waveforms, respectively. Blue numbers denote variance reduction that characterizes the match between the observed and best-fitting synthetic data. The black and red numbers above the panel of the waveform fitting are the peak amplitudes of observed and synthetic waveforms respectively. The y-axis denotes the normalized displacement. Note that events no. 3, 4, 8, 9, and 10 were recorded by borehole stations only. The rest were recorded by borehole and BMKG stations. The set of waveform fitting results for the remaining events are shown in Supplementary Figs. S10–S20, while the data acquisition plot for the first year and second year of the borehole station deployment is shown in Supplementary Fig. S21. The Generic Mapping Tools (GMT) version 6.0⁵⁹ (https://www.generic-mapping-tools.org/) was used to make this figure.