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‘Impossible’ earthquake challenges everything we knew about Earth’s interior By StudyFinds Staff, Reviewed by Steve Fink Research led by Hao Zhang, University of Southern California Jan 28, 2025 Overview of the study region. (a) Map illustrating the focal mechanism of the mainshock (blue focal mechanism plot), the distribution of seismicity in the Izu–Bonin subduction zone (from 2000 to 2023, dots color‐coded by depth), and Hi‐net stations (triangles). The static time correction applied to each station used in the back-projection analysis is represented by color. The black line indicates the cross section A–A′. Toothed lines indicate subduction zones; dashed lines indicate convergent boundaries. (b) Cross section including earthquake locations within 50 km of profile A–A′, with a side‐view projection of the focal mechanism. Most earthquakes are magnitude 4–5, so we do not differentiate magnitudes by marker size. (Credit: The Seismic Record)