Figure 3: Southwest-northeast cross section of the earthquake hypocenters and focal mechanisms in the southwestern Luzon region, as marked in Figure 2. This shows the distribution of shallow and intermediate-depth earthquakes. The cross section is generated using Generic Mapping Tools Ver. 6.2 (Wessel et al., 2019). Inset shows schematic diagram of the subduction process along the Manila Trench and how a focal mechanism shows the direction of tectonic stresses that cause earthquakes. The focal mechanisms plotted in the main figure are in ‘side view’ because this is a cross section. Credit: Llamas et al., 2025, CC BY-NC-ND 4.0

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Figure 3: Southwest-northeast cross section of the earthquake hypocenters and focal mechanisms in the southwestern Luzon region, as marked in Figure 2. This shows the distribution of shallow and intermediate-depth earthquakes. The cross section is generated using Generic Mapping Tools Ver. 6.2 (Wessel et al., 2019). Inset shows schematic diagram of the subduction process along the Manila Trench and how a focal mechanism shows the direction of tectonic stresses that cause earthquakes. The focal mechanisms plotted in the main figure are in ‘side view’ because this is a cross section. Credit: Llamas et al., 2025, CC BY-NC-ND 4.0

Figure 3: Southwest-northeast cross section of the earthquake hypocenters and focal mechanisms in the southwestern Luzon region, as marked in Figure 2. This shows the distribution of shallow and intermediate-depth earthquakes. The cross section is generated using Generic Mapping Tools Ver. 6.2 (Wessel et al., 2019). Inset shows schematic diagram of the subduction process along the Manila Trench and how a focal mechanism shows the direction of tectonic stresses that cause earthquakes. The focal mechanisms plotted in the main figure are in ‘side view’ because this is a cross section. Credit: Llamas et al., 2025, CC BY-NC-ND 4.0

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