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Index Geophysics

Digital recording and analysis of broad-band seismic data at the Graefenberg (GRF) array


Title (Dublin Core)

en-US Digital recording and analysis of broad-band seismic data at the Graefenberg (GRF) array

Description (Dublin Core)

en-US An array of 19 broad-band seismometers with flat velocity response between 0.05 Hz and 5 Hz combined with a binary gain-ranging data acquisition system of 138 db dynamic range is being installed in Southern Germany. The array has a maximum extension of 80 km, it consists mainly of three triangular subarrays, the dimensions of which are chosen so as to reduce the microseisms by simple summation. The dynamic range is accomplished by digitizing the output at the seismometer sites and transmitting the digital information on telephone lines to a central control station. Single station data are available since 1975 and continuous recordings of the first subarray exist since 1976. They provide extended information of the fine structure of the seismic wave field in the medium frequency range between 0.5 Hz and 0.05 Hz and allow the quantitative investigation of frequency-dependent seismic phenomena over a wide range of amplitude and frequency. An elementary problem is the numerical analysis of broad-band seismograph systems especially seismometer-galvanometer systems and the determination of the true ground displacement or velocity. This simulation and restitution problem can be solved by digital recursive filters applying the z-form method. The simulation may include high sensitive short-period detection instruments.

Creator (Dublin Core)

Harjes, H.-P.
Seidl, D.

Subject (Dublin Core)

en-US GRF-array
en-US Broad-band seismology
en-US Digital seismogram analysis
en-US Seismology

Publisher (Dublin Core)

en-US Journal of Geophysics

Date (Dublin Core)


Type (Dublin Core)

en-US Peer-reviewed Article

Format (Dublin Core)


Identifier (Dublin Core)

Source (Dublin Core)

en-US Journal of Geophysics; Vol 44 No 1 (1977): Journal of Geophysics; 511-523

Language (Dublin Core)


Relation (Dublin Core)