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ACCELEROGRAPHS

QUAKELY (TRIAXIAL ACCELEROMETER + VERTICAL GEOPHONE)


Quakely is purpose-built for cost-effective seismic measurements, earthquake early warning, and structural health monitoring.

HIGH PERFORMANCE AND COST-EFFICIENCY

The QUAKELY accelerograph is a sturdy device designed for seismic measurements and structural health monitoring. It is engineered to be compact, budget-friendly, and user-friendly, featuring a high-quality tri-axial accelerometer with a vertical geophone, a microcontroller, and advanced software for real-time capture, analysis, and streaming of ground motion data.

The onboard MEMS triaxial accelerometer and Sunfull Vertical Geophone are synchronously sampled at up to 200 samples per second (sps) with a remarkable 32-bit resolution.

With an integrated memory bank ranging from 32 GB to 256 GB, you can efficiently manage a ring-buffer for extended continuous recordings and event data.

The data format employed is MiniSEED.

The system incorporates advanced trigger criteria (STA/LTA and threshold) to differentiate between false events (e.g., environmental vibrations) and genuine seismic events.

An internal GNSS receiver enables you to create a synchronized network where all instruments share absolute time references.

USER-FRIENDLY OPERATION

You can effortlessly control QUAKELY locally via network connections such as LAN or WiFi.

Thanks to the SeedLink protocol, QUAKELY seamlessly integrates with popular seismic analysis software (Seiscomp3, Antelope, Earthworm).

INTEGRATED UNINTERRUPTIBLE POWER SUPPLY (UPS)

QUAKELY is powered by an external DC source (5 Volt DC) and is equipped with an internal battery (LiPo) that ensures up to 5 hours of autonomy in case of a blackout. The battery is a standard 18650 and can be easily replaced.

ROBUST DESIGN SUITABLE AS A SEISMIC SWITCH

QUAKELY can optionally be equipped with 3 relay outputs and employed as a seismic switch, capable of shutting down sensitive equipment like elevators, pumps, or gas valves. It can also activate alarm systems such as sirens or lights.

The instrument is housed in a rugged anodized aluminum case, ensuring shock resistance and suitability for field applications. QUAKELY is designed with an adjustable mounting plate for straightforward instrument leveling.

Structural health monitoring is one of the main applications of QUAKELY, with tall buildings, where heavy oscillations excite the structure and the amplitude of physical signals is considerable, QUAKELY performs well even if its dynamic range cannot compete with that of TRITON’s.

In a scenario like this, the only high dynamic (and thus more expensive) accelerograph is placed on the ground floor, where the oscillations of the structure are negligible.

QUAKELY and TRITON can be interfaced and controlled using QUAKELOGIC's Structural Health Monitoring software.

A real-time report of the building and a post-earthquake evaluation of the structural damage can be locally displayed or trasmitted remotely.

The good performance/price ratio makes QUAKELY the ideal choice when building a distributed system aimed at creating an array of seismic data.

Earthquake early warning (EEW) concept is the rapid detection of earthquakes and the alerting of people to shaking.

QUAKELY can detect the non-damaging P-waves and transmit the information about tremors to an alarm center or directly to predefined users before the most damaging S-waves arrive.

QUAKELY is currently used for an ongoing project with the INGV (National Institute of Geophysics and Volcanology) which is experimenting with AI algorithms to detect the earthquake autonomously and quickly.

QUAKELY would be an excelent solution for deactivating sensitive electronic devices when a seismic event is detected, closing gas valves or warning people.

FREQUENTLY ASKED QUESTIONS


Is QUAKELY capable of performing both real-time streaming and event-triggering simultaneously?

Answer: Yes, QUAKELY may do both tasks in parallel. For event-triggering, threshold exceedance instead of STA/LTA is recommended for accelerometers.


What happens when the telemetry is down? Can the data be retrieved easily?

Answer: The telemetry works through SeedLINK protocol, which holds data in its ring buffer whose size is by default 1GB (expandable): it corresponds to some days of continuous recording. When the telemetry goes down, the client may request data from the last packet received before the break and then recovered all the missing data. This is automatically handled by the SeedLINK client. Whether the telemetry is up or down, the device always stores data in a separate folder and the telemetry (SeedLINK) server detects it, and copies data in its ring buffer, ready to be sent on request.


Can multiple QUAKELY digitizers at different locations be triggered simultaneously?

Answer: This could be done in two ways. For example, if the 2 or more QUAKELY digitizers are in the same LAN segment, either QUAKELY could reach the trigger status and trigger all the other units with a broadcast message. If they are installed in different LAN segments (for example there is a gateway in the middle), this won't work and we should install an additional module on a Linux machine that catches the alarms from the devices and implements a trigger voting algorithm.


What format does the QUAKELY digitizer use to save event files?

Answer: MiniSEED, just like the continuous recording. But if we install the QUAKELOGIC Event Watchdog software to the remote server, the trigger files may be sent automatically to a remote server and exported in ASCII format, or the server may extract the event data from the continuous recording and perform the export. For example, this would be the best way to interact with a LABVIEW application.


How does QUAKELY digitizer send an event file to a remote server?

Answer: The QUAKELY digitizer can communicate with the remote server (Linux Machine) through MQTT and SeedLINK. The Linux Machine takes care of storing all the continuous recordings from the QUAKELY devices and receives the trigger data through MQTT or just extracts it from the continuous buffer. At this point, data is still available in MiniSEED. Once we have a time window for an event, we may export it in ASCII.


How can QUAKELY digitizer be powered by a solar power?

Answer: The QUAKELY digitizer can be powered by a 12 V solar panel (>100 W). The system requires a solar panel, 12V backup battery and controller unit. QuakeLogic can provide all these auxiliary hardware including on-site installation.

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