Chapter 2. System Overview

Thank-you for purchasing a Güralp Minimus or Minimus+ digitiser.

This section describes the key components of a Minimus system or Minimus+. The Minimus or Minimus+ unit is the main, standard product in the system; other components and accessories are optional and can be purchased separately. Please check your order confirmation to see which components were purchased with your system.

The Minimus has four fully-featured analogue input channels. The Minimus+ is physically wider, with an additional analogue sensor input connector, and provides eight fully-featured analogue input channels. Otherwise, the two units are very similar.

2.1 Key features

• 24-bit, four-channel (⨹ eight-channel) digitiser with nominal 2.44 µV/count sensitivity.

• Compact form, measuring just 134 × 99 × 45 mm (⨹ 134 × 139 × 45 mm) and weighing just 0.67 kg (⨹ 0.78 kg).

• Compatible with all analogue seismic sensors with a voltage output.

• Simultaneously accommodates one (⨹ two) triaxial sensor(s), one (⨹ two) infra-sound sensor(s) and a digital feed from a Radian post-hole or borehole instrument.

• Supports automatic Identification of I.P. addresses via Güralp Discovery software and a cloud-based or organisational registry server.

• Remote instrument and data management via Discovery.

• Bluetooth Android app for installation integrity checking.

• Low-latency mode for Earthquake Early Warning (< 40 ms).

• Hot-swappable data storage with dual redundant microSD cards.

• GNSS time-synchronisation, compatible with Navstar (GPS), GLONASS, Galileo and BeiDou constellations. PTP is available for when GNSS is impractical.

2.2 Typical applications

• Earthquake Early Warning systems.

• Volcanology.

• Multi-scale seismic networks.

• Structural health monitoring.

• Hydrocarbon exploration.

• Permanent reservoir monitoring.

• Induced seismicity detection.

• Explosion monitoring.