Quake RepeaterA mesh repeater that can feel the ground move.

When the sensor feels strong shaking, your repeater posts one short alert to a channel you choose, so your mesh hears about it in seconds. No internet involved.

Get started

What the readings mean

Open the flasher

Alerts in seconds

The repeater sends its alert the moment the sensor finishes measuring, with the final strength and peak-acceleration numbers.

Works when the internet is down

The alert travels over your LoRa mesh like any other channel message. Nothing depends on a connection to the outside world.

Honest numbers

Strength (SI) and peak acceleration (PGA) from one sensor, labelled for what they are. Never a magnitude, never a guess at damage.

Careful by design

Only strong shaking sends anything. One message per shake, a quiet period after it, and a closing line that says it may not be an earthquake.

Keeps good time

A restart or update will not set the repeater's clock back, which would otherwise stop the MeshCore app logging in.

A normal repeater first

Built on Keymind Cascade for the RAK3401. It repeats like any other node, with or without a sensor fitted.

What an alert looks like

Channel #quake-alerts

Shaking detected near 47.61,-122.33. Strength 43.3 cm/s, peak acceleration 148 gal. This does not necessarily indicate an earthquake.

The numbers come from an Omron D7S sensor on the repeater. The location is where the repeater is, rounded to about 1 km. What each part means.

An alert is a local report, not an earthquake announcement

One sensor, in one place, felt strong shaking. It does not say how big an earthquake was, where it started, or whether anything was damaged, and a knocked mast can set it off. Confirm with an official source before acting.

Where to go next

Get started: flash a repeater, set its location and alert channel, and test it.
How to admin your repeater: every command an owner needs, in plain language: the clock, region, alerts and status.
Update over the air: update a repeater on a roof or ridge without a cable.
Earthquake channel alerts: how alerts behave, the message format and the commands.
What the sensor readings mean: read this before you share the channel with others.
Reference: the repeater's clock, D7S sensor integration and the measurement contract.

Firmware releases are on GitHub, and the source is in the repository.