XXIX ESC General Assembly, Sept. 12-17, 2004 - GFZ

To ≈ 10 – 20 s
V up to 295 times
Half-day period (lunar term) at Potsdam
From v. REBEUR-PASCHWITZ (1892)
v. Rebeur-Paschwitz found in the records:
• influence of air pressure and temperature
changes on the records → discusses
causes and need for shielding/avoidance.
• increase of instrumental period with
amplitude and sees the cause in elastic
deformation of suspension and
bearing components (theor. by Bessel).
• the dominant influence of ocean tides
and related crustal deformations in nearcoastal
records (Wilhelmshafen, Teneriffa);
• ← the half-day period (lunar term)
of Earth tides;
• the daily period of Earth tides;
• diurnal and seasonal variations of →
microseisms and their dependence on
wind conditions;
Peter Bormann XXIX ESC General Assembly, Sept. 12-17, 2004