Figure 3. Stress imparted by the 2025 July 20 magnitude 7.4 foreshock brought the epicentral patch of the magnitude 8.8 mainshock about 0.5 bar closer to failure. Overall, there are roughly equal patches of stress increase and decrease. Credit: Temblor, CC BY-NC-ND 4.0

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Figure 3. Stress imparted by the 2025 July 20 magnitude 7.4 foreshock brought the epicentral patch of the magnitude 8.8 mainshock about 0.5 bar closer to failure. Overall, there are roughly equal patches of stress increase and decrease. Credit: Temblor, CC BY-NC-ND 4.0

Figure 3. Stress imparted by the 2025 July 20 magnitude 7.4 foreshock brought the epicentral patch of the magnitude 8.8 mainshock about 0.5 bar closer to failure. Overall, there are roughly equal patches of stress increase and decrease. Credit: Temblor, CC BY-NC-ND 4.0

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