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  • 1
    Call number: 21/STR 03/02
    In: Scientific technical report
    Description / Table of Contents: A Databank was created using data from 25 local catalogues and 30 special studiesof earthquakes in central, northern and northwestern Europe. Event types werediscriminated, fake events and duplets eliminated, and different magnitudes andintensities converted to Mw. The conversions require the establishment of regressionequations. The Catalogue contains tectonic events from the Databank within the area44°N-72°N, 25°W-32°E and the time period 1300-1993 which have Mw magnitudesof 3.50 and larger. The area is covered by different polygons. Within each polygononly data from one or a small number of the local catalogues, supplemented by datafrom special studies, enter the Catalogue. If there are two or more such catalogues orstudies providing a solution for an event, a priority algorithm selects one entry forthe Catalogue. Then Mw is calculated from one of the magnitude types, or frommacroseismic data, given by the selected entry according to another priority scheme.The origin time, location, Mw magnitude and reference are specified for each entryof the Catalogue. So is the epicentral intensity, I0, if provided by the original source.Following these criteria, a total of about 5,000 earthquakes constitute the Catalogue.Although originally derived for the purpose of seismic hazard calculation withinGSHAP, the Catalogue provides a data base for many types of seismicity andseismic hazard studies.
    Type of Medium: GFZ publications
    Pages: 143 S.
    Series Statement: Scientific technical report / Geoforschungszentrum Potsdam 03/02
    Classification:
    Seismology
    Language: English
    Location: Reading room
    Branch Library: GFZ Library
    Location Call Number Expected Availability
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  • 2
    Call number: 21/STR 03/01
    In: Scientific technical report
    Description / Table of Contents: Polar motion data is available from the mid-19th century to the present. Based on time series with a variety of sampling intervals (monthly, 0.05-year, 5-day and daily), we have separated the low-frequency terms by low-pass filtering and the Chandler and annual terms by recursive band-pass filtering of the pole coordinates. Using a simple unweighted least-squares fit to the filtered low-frequency terms, the linear trends of the rotation pole were estimated. Assessing the estimates based on intercomparisons, the most reliable trend estimate was found. Using a Fast Fourier Transform, we have computed the prograde, retrograde and total amplitude spectra of the low-frequency part of polar motion in order to reveal the long-periodic signals. The characteristics and time evolution of the Chandler and annual wobbles are described by changes in their parameters (radii, directions and period lengths) over one century.
    Type of Medium: GFZ publications
    Pages: 51 S.
    Series Statement: Scientific technical report / Geoforschungszentrum Potsdam 03/01
    Classification:
    Geodynamics
    Language: English
    Location: Reading room
    Branch Library: GFZ Library
    Location Call Number Expected Availability
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