Accher

Hantawatch was my first try at this design of map which I have now archived. I can definitely add in Spanish.

I built Klaxon (https://klaxon.live) as a hobby project — a single static HTML page that fetches the USGS GeoJSON feed client-side and renders it on a Leaflet map. No backend, no database, no tracking, no ads. It deploys as one file on Netlify.

It shows M3.5+ earthquakes (1h/24h/7d), with tectonic plate boundaries overlaid so the spatial pattern is obvious. Popups surface USGS PAGER alert level, MMI, felt reports and tsunami flags when present. For events in Japan it links to JMA, since Japanese users think in shindo intensity rather than magnitude. UI is in English, Japanese and Korean.

Deliberately limited: it does not ingest JMA/NOAA directly (CORS + the static-only constraint), it's not an alerting system, and tsunami support is just a filter on USGS's tsunami flag — not wave modelling. It's a situational-awareness map, not a warning service.

It's a sibling to an earlier project of mine (an outbreak tracker). Happy to answer questions about the architecture or the deliberate constraints.