Figure 3. The epicenter of the magnitude 7.5 shock lies in a “saddle” in the calculated fault slip (USGS, 2024). Over a 30-second period, the rupture propagated both to the southwest, where the slip peaked at about 3 meters, and also to the northeast, where it reached 1.5 meters. Aftershocks (from the USGS ANSS catalog) are seen both near the site of high slip in the southwest and in the epicentral slip saddle. JMA (Japan Meteorological Agency) plans to release the full catalog of aftershocks greater than or equal to magnitude 1.0 soon, which will provide a richer and perhaps more accurate picture. Credit: Modified from USGS