A powerful earthquake struck Kumamoto Prefecture, Japan on July 28.
The Japan Meteorological Agency reported a magnitude of 7.1 (USGS: Mw 6.8) at a shallow depth of around 10km, with shaking reaching Japan's highest intensity level, Shindo 7, in parts of Kyushu. Authorities are warning of continued aftershock risk. Early reports point to dozens of fatalities, hundreds of injuries, and localised structural damage.
Kumamoto is also a major semiconductor manufacturing hub, and several facilities linked to TSMC/JASM, Sony, Tokyo Electron and other suppliers paused operations for safety inspections.
Howden Re Head of International Catastrophe Model Research Myrto Papaspiliou said: "This event follows a similar magnitude and depth to the 2016 Kumamoto sequence, which culminated in a Mw 7.0 mainshock two days after an initial foreshock, and produced comparably severe local shaking, though across a slightly different footprint. Researchers Ross Stein and Shinji Toda had already flagged elevated stress on fault segments south of that rupture, so this event may have been promoted by it. While Japan is one of the world's most seismically active countries, this part of Kyushu is not associated with its largest subduction-zone earthquake sources. The causative fault looks likely to be the southern Hinagu/Yatsushiro system, which geological evidence suggests may not have seen a major surface-rupturing earthquake for centuries, potentially several millennia."
Howden Re Japan CEO Kentaro Tada said: "Our focus right now is on those affected across Kyushu. Reported damage to Kumamoto's semiconductor infrastructure appears limited so far, though restart timelines will determine the scale of business interruption losses. It's too early for formal estimates, but we'd expect insured losses to remain well below the 2016 Kumamoto earthquake and closer to the 2024 Noto earthquake, unless the aftershock sequence reveals more extensive damage."