Overview
- A loud lightning strike over west Mexico City produced a strong acoustic shock wave that was picked up by local seismographs and felt as a prolonged boom by residents.
- Seismographs in multiple boroughs, including a station in Benito Juárez, registered the pulse that coincided with the disturbance felt around 4:56 p.m. on Wednesday.
- The private alert platform SkyAlert issued a notice that did not include a calculated time or intensity and later said its experimental detection system can produce false positives for non-tectonic events.
- SASSLA Clima and Sismo Alerta Mexicana published technical clarifications attributing the recordings to the lightning impact rather than a tectonic microsismo.
- City authorities had already issued an Orange Alert for heavy rain and possible hail in several boroughs, and experts noted that strong surface acoustic waves from lightning can briefly mimic ground motion on sensitive seismic networks, underscoring a need to refine alert algorithms and public guidance.