EarthQuake 300W.2 Specifications download pdf (Page 4)

2 Overview seismic system

In this section an overview of the total seismic system is given and described. It shows the

different subsystems which are described in further detail in subsequent sections. This section

describes in a general manner how the sensor network LOFAR is implemented for seismic

applications.

In Figure 2.1 a drawing is shown which gives the over-all structure. The data start to be sensed

by the sensors in the field. Locally, the data is converted to digital signals before they are sent

over the LOFAR network to a central unit at the “Rekencentrum” of Groningen. There, the data

are collected, (automatically) analyzed and pre-processed if necessary. Then, based on the

application, the data is sent via standard internet to TNO and/or KNMI for storage, further

analysis and interpretation. These two institutes then allow these data to be retrieved via standard

internet by other users, such as the TU Delft.

Figure 2.1. Pictorial overview of seismic system of LOFAR

The description so far dealt with the stream of data and not the control, such as parameter setting

and testing. The control of the data and meta-data can be done locally on a sensor field, globally

via the central server at Groningen or remotely via any place on the internet, although not all

functionality is available at all locations. The functionality at each level will be described

separately. For the description in the sections, the total system is divided into the following

subsystems:

- local (sensor) fields

- central LOFAR network

- central system (Groningen Rekencentrum, with TNO facilities)

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EarthQuake 300W.2 Specifications Page 4