Figure 1a Seismotectonics of the magnitude 7.4 earthquake of Dec. 2, 2023, in the province of Surigao Del Sur, Mindanao (southern Philippines). Result of Coulomb stress change modeling shown, using the magnitude 7.4 mainshock as source fault (thrust mechanism) and the next event (normal fault) as the receiver fault. Focal mechanism solutions of the mainshock (7.4) and 24 succeeding seismic events with magnitudes ranging from magnitude 4.9 to 6.8, and other post -mainshock events of lower magnitudes (small circles) are shown. Locations of cross section Figures 1b and 2 and Coulomb stress transfer cross section Figure 3 are shown. Data: Jarvis et al., 2008 for SRTM topography; Weatherall et al., 2020 for bathymetry; Toda et al., 2011 for CST modeling; PHIVOLCS for earthquake data. GMT (Wessel and Smith, 1995) was used to generate the map. See text for more discussion. Credit: Aurelio, Catugas, Anicete, 2023.

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Figure 1a Seismotectonics of the magnitude 7.4 earthquake of Dec. 2, 2023, in the province of Surigao Del Sur, Mindanao (southern Philippines). Result of Coulomb stress change modeling shown, using the magnitude 7.4 mainshock as source fault (thrust mechanism) and the next event (normal fault) as the receiver fault. Focal mechanism solutions of the mainshock (7.4) and 24 succeeding seismic events with magnitudes ranging from magnitude 4.9 to 6.8, and other post -mainshock events of lower magnitudes (small circles) are shown. Locations of cross section Figures 1b and 2 and Coulomb stress transfer cross section Figure 3 are shown. Data: Jarvis et al., 2008 for SRTM topography; Weatherall et al., 2020 for bathymetry; Toda et al., 2011 for CST modeling; PHIVOLCS for earthquake data. GMT (Wessel and Smith, 1995) was used to generate the map. See text for more discussion. Credit: Aurelio, Catugas, Anicete, 2023.

Figure 1a Seismotectonics of the magnitude 7.4 earthquake of Dec. 2, 2023, in the province of Surigao Del Sur, Mindanao (southern Philippines). Result of Coulomb stress change modeling shown, using the magnitude 7.4 mainshock as source fault (thrust mechanism) and the next event (normal fault) as the receiver fault. Focal mechanism solutions of the mainshock (7.4) and 24 succeeding seismic events with magnitudes ranging from magnitude 4.9 to 6.8, and other post -mainshock events of lower magnitudes (small circles) are shown. Locations of cross section Figures 1b and 2 and Coulomb stress transfer cross section Figure 3 are shown. Data: Jarvis et al., 2008 for SRTM topography; Weatherall et al., 2020 for bathymetry; Toda et al., 2011 for CST modeling; PHIVOLCS for earthquake data. GMT (Wessel and Smith, 1995) was used to generate the map. See text for more discussion. Credit: Aurelio, Catugas, Anicete, 2023.

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