Months‐Long Crustal Deformation Driven by Aseismic Slips and Pore Pressure Transients Triggered by Local and Regional Earthquakes

Strong strain and pore pressure changes are observed after three Mw 4.5+ local one 7.2 regional earthquake during 2010–2017 in borehole strainmeters near Anza, California. The change emerges immediately the earthquakes lasts 40–100 days with amplitudes up to 10−7, larger than coseismic offsets. exhibits at some boreholes a delay of 4–10 others. A joint analysis postseismic suggests that strains could be explained by combined effects poroelastic deformation due earthquake-induced elastic an earthquake-triggered aseismic slip on fault. Our study indicates that, addition possible fault slips triggered earthquake, even more important producing deformation.