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Hardware

We build a
seismic sensor.

The GeoShake T1 is hardware — a palm-sized seismic sensor that AppFlows designs, manufactures and supports. It measures ground motion inside a home, streams what it reads to a shared network over Wi-Fi, and warns people through the GeoShake app once the network confirms an earthquake.

ESP32-S3 · 4× LSM6DSOWi-Fi · MQTT over TLSOpen-source firmware

The device

Small enough to hold.

The T1 ships assembled, tested and flashed. Inside it there is an ESP32-S3 microcontroller and an array of four LSM6DSO six-axis accelerometers, reading all three axes at roughly 110 Hz. It runs on USB-C at under a watt and publishes over MQTT with TLS. The firmware is GPL-3.0 and the enclosure files are CC BY-SA 4.0 — both public, so anyone can check what the device actually does.

The GeoShake T1: a small matte black cube, held in a hand for scale
GeoShake T1 — 64 × 54 × 34 mm, 45 g. Photographed in hand for scale.
Sensor
4× LSM6DSO · 6-axis IMU array
Sample rate
104–110 Hz · all three axes
MCU
ESP32-S3 · dual-core 240 MHz
Detection
On-device STA/LTA · 0.5 s / 30 s windows
Connectivity
Wi-Fi 2.4 GHz b/g/n · Bluetooth LE 5
Protocol
MQTT over TLS
Updates
Signed OTA (RSA-3072) · automatic rollback
Power
USB-C · 0.7–1 W typical
Size
64 × 54 × 34 mm · 45 g
License
Firmware GPL-3.0 · enclosure CC BY-SA 4.0

How it works

Detect, agree, warn.

  1. Detects

    Four accelerometers read the ground without pause. An earthquake sends a fast, weak P-wave ahead of the slower, damaging S-wave; when the P-wave arrives, an STA/LTA trigger running on the device fires within milliseconds. STA/LTA is the standard trigger used in seismology.

  2. Agrees

    One device noticing a jolt is not an earthquake. Each trigger is matched against neighboring stations in space and time, and an event is published only when enough of the stations that should have felt it actually did — and the arrival times fit the speed a real seismic wave travels at. A slammed door does not clear that bar.

  3. Warns

    A confirmed event goes out to the GeoShake apps on iOS and Android, and appears on the public live map with its location and intensity.

GeoShake detects earthquakes as they begin — it does not predict them, and it does not replace official warning authorities. It is a community network that runs alongside them.

The product

See the device.

Full specifications, setup documentation, the live station map and ordering are all on the GeoShake site.

geoshake.org GeoShake T1 product page

GeoShake™ is a trademark of APPFLOWS TEKNOLOJİ ANONİM ŞİRKETİ. The device, its firmware and the network behind it are designed and operated by AppFlows.