Abstract
AbstractWe investigate the non‐double‐couple components of 224 M ≥ 3.0 earthquakes in the 2019 Mw7.1 Ridgecrest sequence, which occurred on a complex fault system in the Eastern California Shear Zone. Full moment tensors are derived using waveform data from near‐fault and regional stations with a generalized cut‐and‐paste inversion and 3‐D velocity and attenuation models. The results show limited Compensated Linear Vector Dipole components, but considerable explosive isotropic components (5%–15% of the total moments) for approximately 50 earthquakes. Most of these events occur between the Mw6.4 foreshock and 1 day after the Mw7.1 mainshock and are mainly distributed around the rupture ends and fault intersections. The percentage of isotropic components is reduced considerably when data recorded by near‐fault stations are not included in the inversions, highlighting the importance of near‐fault data. The results suggest that high‐frequency damage‐related radiation and other local dilatational processes are responsible for the observed isotropic source terms.
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