Figure 1 Seismotectonics of four moderate magnitude, thrust-mechanism earthquakes (shown by beachballs) occurring in the same region in Batangas, southern Luzon, Philippines, within a period of nine weeks. The most recent event of September 27, 2021 is shown in red for emphasis. Result of Coulomb stress change modeling following July maganitude-6.6 event shown. References: 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. Credit: Aurelio, Lagmay, Escudero, Catugas.
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