Figure 1 Seismotectonics of the magnitude-7.0 July 27, 2022, earthquake that struck the province of Abra and vicinity, in the northwestern sector of Luzon Islands, Philippines, based on 10 days of aftershock data. Result of Coulomb stress change modeling shown, using the mainshock as the source and a hypothetical fault with fault parameters similar to the first nodal plane of the mainshock as the receiver. Yellow dashed line in the cross section is a best-fit line for a likely rupturing fault. Map shows aftershocks with magnitude-3 and greater events, while the cross section shows magnitude-4 and greater events. Inset map on the upper right corner of the map indicates place names of towns and provinces discussed in the text. References: Jarvis et al., 2008 for SRTM topography; Weatherall et al., 2020 for bathymetry; Toda et al., 2011 for Coulomb Stress Transfer modeling; PHIVOLCS for earthquake data. GMT (Wessel and Smith, 1995) was used to generate the map and cross section. See text for more discussion. Credit: Aurelio, Catugas, Lagmay.