Digital recording and analysis of broad-band seismic data at the Graefenberg (GRF) array
Article Sidebar
Main Article Content
Abstract
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.
ARK: https://n2t.net/ark:/88439/y012005
Permalink: https://geophysicsjournal.com/article/127
Article Details
Authors who publish with this journal as of Vol. 63 agree to the following terms:
a. Authors share the copyright with this journal in equal parts (50% to the journal, 50% to the lead author), and grant the journal right of first publication, with the work after publication simultaneously licensed under Creative Commons Attribution License CC BY-NC-ND 4.0 that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
b. Authors may enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal, and a reference to this copyright notice.
c. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) during the submission process, as this can lead to productive exchanges and earlier and greater citation of published work and better sales of the copyright.
Author Self-archiving
Authors retain copyright and grant the Journal of Geophysics right of first publication, with the work three years after publication simultaneously licensed under the Creative Commons BY-NC-ND 4.0 License that allows others to share the work (with an acknowledgment of the work's authorship and initial publication in this journal), except for commercial purposes and for creating derivatives.
Authors can enter into separate, additional, but non-commercial contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository, but not publish it in a book), with an acknowledgment of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) before and during the submission process, as that can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
Additional Notes
This journal is one of a handful of scholarly journals that publish original scientific works under CC BY-NC-ND 4.0 - the only Creative Commons license affording the authors' intellectual property absolute worldwide protection.
Journal of Geophysics is published under the scholar-publishers model, meaning authors do not surrender their copyright to us. Instead, and unlike corporate publishers like Elsevier or Springer Nature that resell copyright to third-parties for up to $80,000 (per paper, per transaction!), the Journal of Geophysics authors share copyright equally with this journal.
Therefore, all the proceeds from reselling copyright to third parties get shared to equal parts (50% to the journal, 50% to the lead author). Under the Berne Convention, this protection is an inheritable right that lasts for as long as the rightsholder lives + 50 years.
By submitting to this journal, the lead author, on behalf of all co-authors, grants permission to this journal to represent all co-authors in negotiating copyright sales and collecting proceeds. The lead author should negotiate with his/her co-authors the modalities of distributing the lead author's portion of the proceeds. Usually, this is per pre-agreed percentage of each co-author's contribution to creating the copyrighted work. (more...)
References
Berckhemer, H. (1971) The concept of wide-band seismometry. Observ. Royal Belgique, Serie Geophys. No. 101:214-220
Green, P.E., Frosch, R.A., Romney, C.F. (1965) Principles of an experimental large aperture seismic array (LASA). Proc. IEEE 53:1821-1833
Harjes, H.-P., Henger, M. (1973) Array-Seismologie. Z. Geophys. 39:865-905
Henger, M. (1975) Wavenumber filtering of microseism with triangular arrays. NATO Advanced Study Institute Series, E: Applied Sciences 11:205-210
Kaiser, J.F. (1963) Design methods for sampled data filters. Proc. 1st Annu. Allerton Conf. Circuit System Theory 221-236
Kelly, E.J. (1967) Response of seismic arrays to wide-band signals. Linc. Lab. Techn. Note 1967-30
Peterson, J., Butler, H.M., Holcomb, L.G., Hutt, G.R. (1976) The Seismic Research Observatory Bull. Seism. Soc. Am. 66:2049-2068
Wielandt, E. (1975) Astatic vertical pendulum supported by a leaf spring. J. Geophys. 41:545-546