## 3 Results and Discussion  
### Source Model  
The \(H\)(t) value retrieved from the seismogram data recorded at one station is called the apparent SFT (ASTF). ASTFs from different stations represent the energy release process of an earthquake from different distances and directions. If the ASTFs are retrieved from stations well distributed around the hypocenter of an earthquake, they will be employed to invert the rupture process by Equations (5)-(7). We examined data from 16 stations to determine the ASTFs (recorded by Incorporated Research Institutions Seismology, IRIS) around the hypocenter of the Meinong earthquake, as presented in Figure 1.  
For seismic data, the secondary seismic waves (S-waves) of vertical components were used. The S-wave displacements (solid line) filtered by a band-pass filter with a frequency band of 0.001-1 Hz are displayed in Figure 2.  
Figure 1: Locations of the epicenter (star) of the Meinong earthquake and 16 teleseismic stations (triangles) used for assessing the STFs of the event (M\({}_{\rm w}\) = 6.4). That figure presents a comparison of observed (solid line) and predicted (red line) S-waves, as determined by the convolution of estimated Green's functions with the ASTFs of stations. The observed and predicted S-waves were similar. We derived the ASTFs from the HHD of S-waves recorded at the stations indicated in Figure 1. On the basis of the ASTFs (blue line) in Figure 3, the rupture duration was estimated to be 15 s, and the main moment may have occurred in the first 7 s and decreased after 7 s.  
[PERSON] et al. (2017) [4] used the back projection method and examined the seismic waves recorded by two arrays, proposing that energy release in the source process of the Meinong  
Figure 3: Comparison of ASTFs (blue line) for the Meinong event calculated using the proposed method for handling teleseismic data and ASTFs (red line) calculated using the inverted source model. The correlation coefficients between the estimated and synthetic ASTFs were all above 0.94. Figure 2: Comparisons of the observed S-wave waveforms (blue line) and synthetic waveforms (dashed line) for the Meinong earthquake. The synthetic waveforms are the convolutions of the derived ASTFs obtained using HHD, with Green’s functions extracted from the waveforms. earthquake lasted approximately 7 s. [PERSON] et al. (2016) [3] proposed that the duration time of STF of the Meinong earthquake was 16 s and that the source model of this event comprised two main asperities. The main energy higher than 60% of the total moment was released in the first 8 s. The STF curve of that Meinong event derived by [2] also indicated that the source duration was 12 s and the main energy of the Meinong earthquake was estimated to have been released in the first 6 s. Our result is generally consistent with those of relevant studies. On the basis of source duration, we determine that the fault model was composed of a single plane and that the fault dimension was approximately 45 \(\times\) 39 km\({}^{2}\), with the epicenter located at a depth of 14.6 km. For source model inversion, the fault was further divided into subfaults of equal size (3 \(\times\) 2.6 km\({}^{2}\)). The frequency band of 0.001-1 Hz reveals the minimum waveform period (1 s), and the crustal S-wave velocity of an earthquake with a focal depth of 14.6 km is approximately 4.6 km/s; therefore, the minimum wavelength was 4.6 km. According to [24], the resolving length is \(\lambda/4\); the resolving length in this study was determined to be approximately 1.15 km smaller than 4.6 km, ensuring that the inverted source model was reasonable and had a suitable resolution. Figure 4 presents a map view of slip amplitude distributions, where the red star is the epicenter of the Meinong event. Figure 4 reveals that the rupture direction was northwest; this finding agrees with the results of [3; 4; 9].