Skoog Rescue
QuakeRescue LifeLink
AutomaticPulse
You can be prepared and add an extra layer of safety for yourself and others.
QuakeRescue LifeLink gives you a second chance to be found after an earthquake — and a way to help find others. If you are injured, trapped, unconscious, or unable to use your phone, it can automatically become a rescue beacon.
Automatic Activation When The User Cannot Act
When monitoring is active, the app uses the phone’s motion sensors to analyse movement for earthquake-like patterns. The system has been developed and evaluated using authentic earthquake recordings and extensive testing against everyday human movement.
If detection criteria are met, a 5-minute safety countdown starts automatically. If you cannot respond, rescue mode activates automatically when countdown reaches zero.
Rescue-system design objective
SOS Quake BLE beacon
Android 8.0+
Available languages ▼
Arabic — العربية
Bengali — বাংলা
Burmese — မြန်မာ
Chinese (Simplified) — 简体中文
Chinese (Traditional) — 繁體中文
English — English
Filipino — Filipino
French — Français
German — Deutsch
Greek — Ελληνικά
Hindi — हिन्दी
Indonesian — Bahasa Indonesia
Italian — Italiano
Japanese — 日本語
Korean — 한국어
Nepali — नेपाली
Persian — فارسی
Portuguese — Português
Romanian — Română
Russian — Русский
Spanish — Español
Swedish — Svenska
Tamil — தமிழ்
Thai — ไทย
Turkish — Türkçe
Ukrainian — Українська
Urdu — اردو
Vietnamese — Tiếng Việt
Multiple Ways To Be Found
- Continuous SOS Quake beacon: While siren operates in battery-saving pulses, the SOS Quake BLE beacon remains active continuously throughout rescue mode. Continuously detectable as “SOS Quake” by ordinary mobile phones and rescue service scanners using compatible BLE scanner apps.
- Battery-adaptive siren: Multi-frequency rescue siren with two 15-second sound pulses separated by 10 seconds of silence. Each siren cycle consists of: 15 seconds siren; 10 seconds silence; 15 seconds siren. Cycles become less frequent as battery decreases — designed with the objective of maintaining the rescue system for at least 96 hours. Actual operating time may be affected by phone model, battery condition, temperature, system settings, signal environment and other conditions.
- Built-in scanner with signal-strength and approach guidance: The built-in scanner displays nearby BLE devices detected during the scan, grouped as SOS Quake signals, named BLE devices and unidentified BLE devices. Sorted by signal strength, with the strongest signals first. It shows signal strength in RSSI, signal levels as very close, close, moderate, far and very weak, a signal bar, and indicates whether the signal is getting stronger, stable or getting weaker — whether you are getting closer or moving away from the signal. This helps locate the person under rubble. Rescue services can use their own scanners, and ordinary people can use their phones to quickly help.
- Matching ID system: The ID in the optional emergency SMS matches the BLE beacon ID. This helps connect a received location message with its rescue signal and distinguish between multiple active signals.
- Works without dedicated infrastructure: Core rescue functions — motion detection, the BLE beacon and the siren — can operate without internet. Optional emergency SMS requires mobile service, and recent earthquake information requires internet access.
How It Works: Automatic Activation
Developed With Real Quakes
Motion analysis developed using authentic earthquake recordings and validated against extensive everyday human movement, including driving, exercise equipment, running, walking, stairs and other common activities.
5-Minute Safety Window
Countdown starts automatically. Hold ‘I AM SAFE’ to cancel. Hold ‘ACTIVATE NOW’ to start Rescue Mode immediately. Do nothing? It activates automatically at zero.
Continuous Beacon + Adaptive Siren
SOS Quake BLE beacon continuous, continuously detectable as “SOS Quake” by ordinary mobile phones and rescue service scanners using compatible BLE scanner apps. Siren: 15 seconds siren, 10 seconds silence, 15 seconds siren. Optional emergency SMS with available location and matching beacon ID unique for the current rescue event.
Tested Against Everyday Life
Tested against extensive everyday movement. The system has been developed and evaluated using authentic recordings and everyday human movement.
Official Earthquake Alerts
When monitoring is active, the app checks official earthquake-data services. If a reported earthquake meets the app’s magnitude and distance criteria for the user’s location, the five-minute safety countdown starts automatically. The countdown displays the source, magnitude and distance to the reported earthquake. This function requires internet access and usable location information.
Sources: USGS, EMSC, JMA. Example criteria from launch build: M6.0+ within 150 km, M6.5+ within 300 km, M7.0+ within 500 km, up to M8.0+ within 1000 km, event age max 2 hours. Duplicate protection within 5 min / 50 km / 0.3 magnitude.
Battery-Adaptive Schedule: 96-Hour Design Objective
| Battery Level | Siren Interval | BLE |
|---|---|---|
| 51–100% | approx. 15 minutes | Continuous |
| 31–50% | approx. 20 minutes | Continuous |
| 16–30% | approx. 60 minutes | Continuous |
| 6–15% | approx. 120 minutes | Continuous |
| 0–5% | approx. 240 minutes | Continuous |
Each siren cycle: 15 seconds siren; 10 seconds silence; 15 seconds siren. BLE “SOS Quake” remains continuous.
Tested Against Earthquakes and Human Movement
The app includes a safe verification function using authentic recordings from different real earthquakes. Users can see whether the analysis would have started the five-minute safety countdown.
Verification is isolated from the real rescue chain. It does not send emergency SMS messages or activate the BLE beacon or siren.
What Rescue Teams See
When beacon is active, nearby compatible BLE scanners continuously detect:
RSSI: -67 dBm (signal strength)
Proximity: very close / close / moderate / far / very weak
Signal bar: visual strength indicator
Beacon ID: 8F2A9C (unique for the current rescue event, 6 hex chars)
Status: getting closer / stable / moving away
Built-in scanner displays nearby BLE devices detected during the scan, grouped as SOS Quake signals, named BLE devices and unidentified BLE devices. Sorted by signal strength, with the strongest signals first. It shows signal strength and an approximate proximity category and indicates whether the signal is getting stronger, stable or getting weaker. Rescue services can use their professional BLE scanners, while anyone can detect “SOS Quake” with a normal Bluetooth search on an iPhone, Android phone or other compatible device. For more precise searching, the built-in QuakeRescue LifeLink scanner or other BLE-scanning apps can also be used.
Designed For Practical Resilience + Privacy By Design
Core functions: Automatic sensor-based earthquake analysis, automatic activation if user cannot respond, immediate manual rescue activation by holding ’I NEED HELP’, continuous SOS Quake BLE beacon, unique rescue-event ID (6 hex characters, unique for the current rescue event), battery-adaptive siren, optional location SMS and built-in beacon scanner with signal-strength and approach guidance.
Core rescue functions — motion detection, the BLE beacon and the siren — can operate without internet. Optional emergency SMS requires mobile service, and recent earthquake information and official earthquake alerts require internet access. Supports 29 languages, designed for Android 8.0+.
Privacy: Motion-sensor analysis performed locally. No advertising, analytics, tracking SDKs or developer-operated cloud backend. SMS, BLE and external earthquake-data requests operate as described in Privacy Policy.
Requirements: Monitoring must be activated before an event. Bluetooth, notification and other required permissions must be granted. Optional emergency SMS disabled by default and requires configuration, mobile service and SMS permission. Location depends on device availability and permission. Official earthquake alerts require internet and usable location.
QuakeRescue LifeLink v2.0
For Android 8.0+ • 29 Languages • Core rescue functions can operate without internet
Both buttons use the same official Google Play link for trust and safety. No account needed.
Collaboration, Research and Technical Evaluation
Developers and operators of earthquake monitoring and warning apps and services, universities, research institutions and rescue organisations are welcome to explore collaboration on QuakeRescue LifeLink. A particular area of interest is how QuakeRescue LifeLink’s post-earthquake rescue functions could complement existing earthquake detection and warning systems. For enquiries about collaboration, research or technical evaluation, please get in touch by email. Source code may be shared for these purposes under individually agreed conditions, with the scope of access and permitted use established before access is granted.
📄 Open Source Technical Report — Zenodo: doi.org/10.5281/zenodo.22794003 →
License: CC BY 4.0 — Use with attribution.
A Proactive Complement To Rescue Efforts
QuakeRescue LifeLink creates additional opportunities for a trapped person to be found using an ordinary Android phone. The same app can help search for nearby rescue signals with signal-strength and approach guidance.
The app complements official emergency alerts, emergency services, professional rescue operations and established safety procedures. It does not replace them. In an emergency, follow instructions from authorities and contact local emergency services whenever possible.