Overview
- The burst, which between Wednesday and Thursday produced 13 earthquakes of magnitude 4.0 or greater, affected eight countries around the Pacific Ring of Fire.
- Several rapid clusters were recorded, including three quakes near Isangel, Vanuatu (M5.2, M4.8, M4.7), three offshore near Puerto Madero, Mexico (M4.3, M4.4, M4.5), and a M5.3 then M4.7 pair off Alianza Cristiana, Peru.
- A shallow M5.0 struck about 51 miles south‑southeast of San José, Costa Rica, and an unusually deep M4.8 occurred about 231 miles beneath Cliza, Bolivia, highlighting wide variation in quake depth and likely surface impact.
- A M4.2 near Lake Louise, Alaska, was widely felt with more than 230 public reports of shaking, while authorities including the USGS are continuing to monitor seismicity across the region.
- The Ring of Fire is the planet’s most active seismic zone where plate subduction drives frequent quakes, so officials say this short surge fits into a broader period of elevated activity and should prompt local readiness rather than expectations of a single large event.