Seismic Record UnitSeismic Record Unit
Having been in the past the city of Alicante, a pioneer in the installation of seismic instrumentation and possessing a long tradition in the study of many aspects related to simian phenomena, which crystallizes into such signal names such as King Shepherd and Vicente Inglada, the University Institution since 1968 has been providing its services to Alicante society could not afford to ignore the existence of such significant events.
In this spirit, teachers Rubio and Jose Antonio Estevez Gosálvez Antonio Pina , Department of Earth Sciences and Environment at the University of Alicante requested the support of the Generalitat Valenciana through the Directorate General of Environment played by D. Carlos Auernheimer, which in 1990 acquired the necessary elements to form the nucleus of a telemetric network microseismicity, entrusted to Professor D. Juan José Giner Caturla the task of forming and leading a team to proceed with the installation, operation, development, evaluation and exploitation of the same This was done in phases over 1991 and subsequent years, reaching full operational in 1993. During this process was invaluable collaboration of university professor D. Carlos López Casado, Seismic Hazard and specialist Microzonation.
At the moment the system is defined as a network of seismic data acquisition and communications analog recording, with its limited capacity for the type of record, to measure the arrival times of seismic event, with an accuracy of a few tenths of a second, which moved to the uncertainty in the position of the epicenter, and without taking into account other sources of error, providing a margin locations the order of eight miles, suitable for events of regional, but not sufficient for small local event detection and precise location of which must be one of the objectives of the network. 
In view of which is produced in collaboration with HE. Provincial Government a detailed plan of action, whose lines are on the one hand, extending the dynamic range of registration, and increased accuracy in the measurement of time, together with improved geographical coverage by another system. This was achieved through the digitization of records, the incorporation of autonomous triaxial stations and the acquisition of GPS receivers.
The updated analysis of the operational system, indicates the full detection Richter magnitude event, with a lower threshold of 2.0, occurred in a geographical area of approximately 17,000 km2, which includes the province and neighboring areas adjacent sea area, and its location with margins of statistical error, the order of 500 meters for events in the Vega Baja del Segura, optimum location area according to the design of dispositivo.La implementation of numerical analysis methods, also allows focal parameters obtained as the magnitude, which are routinely carried out various measurements, the polarity of the first motion, the scalar seismic moment, corner frequency, the size of the seismic source, etc, also obtained the focal mechanisms of events but significant cooperation with the National Seismic Network.
