The stations are deployed on the south-east of Andalusia and eight of them are telemetered to a central recording site at Cartuja Observatory, University of Granada, and the remaining five to the central at the Campus of the University of Almer a, some 110 km away. The network configuration is intended to cover the most active zone in Spain and the field sites were chosen as far as possible on hard rock, low cultural noise and line of sight of the central. The equipment were designed and built at the institute. Some of them are on hard rock for near-field source studies and as reference and others are on sites where wave amplification has been observed during recent events. The data acquisition system is a 24 bits data-logger Quanterra in one case and other three are also 24 bits equipment of own design for lower power consumption.
T are available.
The arrays are built as eight-channel modules with an independent remote preamplifier for each and cable transmission up to several hundred of meters. Each module has its own 16 bits data-acquisition system, GPS time receiver and is controlled by a portable PC which act also as data logger. The system is designed for car battery operation and lightweight so as it can operate on difficult access sites such as volcanic areas. As sensors it uses either standard 1Hz or small 4.5Hz geophones with response shaped to be flat up to 1 sec by means of velocity-feedback force and filtering.