The HERD signal log is live
This is our open log. As the network grows, significant seismic and volcanic events near our coastlines will appear here with honest notes — and, in time, with what our own sensors recorded.
HERD
Reference events — what a dense network is built to hear
Logged for context. HERD was not yet listening for these — they are exactly the signals a citizen infrasound network is designed to catch earlier and denser.
Hunga Tonga–Hunga Haʻapai, Tonga
One of the most powerful eruptions of the satellite era. Its atmospheric pressure wave circled the Earth several times and was recorded by all 53 stations of the global IMS infrasound network — proof that such events literally sound out across the planet.
Wikipedia · source
Anak Krakatau, Sunda Strait, Indonesia
A flank collapse of the volcano triggered a tsunami with no preceding earthquake — so seismic warning systems stayed silent. Over 400 people died. Exactly the blind spot a dense infrasound and pressure network is meant to cover.
Wikipedia · source
Sulawesi (Palu), Indonesia
An earthquake and an unusually fast local tsunami struck Palu within minutes. The very short warning window is the core problem HERD works on: even a few extra minutes save lives.
Wikipedia · source
Tōhoku, Japan
Even the world's most advanced warning system gave coastal communities only minutes. A reminder that no single technology is enough — density and redundancy of sensors save lives.
Wikipedia · source
Sumatra–Andaman, Indian Ocean
The disaster HERD was born from. With no Indian Ocean warning system in place, around 230,000 people across fourteen countries lost their lives. This project exists in memory of that day.
Wikipedia · source