11.07.2015 Views

Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

SHOW MORE
SHOW LESS
  • No tags were found...

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Analysis of <strong>Historical</strong> <strong>Seismograms</strong> <strong>from</strong> <strong>the</strong> Potsdam Station (GDR) 53Tahellarisehe chersicht uber die yon n'ie<strong>the</strong>rts a5tatiwhrm I'tnclelseismonieter vom 28. Narz his 15. Jnli 1902 in Leiyziggelieferten Sri~mu:ramnir ton Fernhehen.Figure 2. First data <strong>from</strong> <strong>the</strong> Leipzig station (Etzold, 1902). [List of distant earthquakes<strong>from</strong> March 28 to July 15, 1902 recorded by <strong>the</strong> Wiechert astatic pendulum seismometerat Leipzig].Table 2. Characteristics of <strong>the</strong> Horizontal Pendulum in Operation at Potsdam(April 1, 1902 to June 7, 1909)MassLength of <strong>the</strong> arm85g17.1 cmDamping coefficient 1.5:l Apr 1, 1902 - Aug 19064.1:l August - October 19067.5:l (E-comp) since October 19065.0:l (N-comp) since October 1906Natural period18 secDistance pendulum mirror- 3.08 mrecording drumMagnification 36Recording speed36 cm/hrComponents NW-SE Apr 1, 1902 - Aug 20, 1903NE-SWApr 1, 1902 - Aug 20, 1903N-S since Oct 13, 1903EW since Oct 13. 1903Table 3. Characteristics of <strong>the</strong> Astatic Wiechert Seismometer at PotsdamIn operation since Oct 13, 1903Mass1100 kgNatural periodabout 14 secDamping coefficient about 5:lRecording speedabout 64 cm/hrMagnification E: 180 - Oct 13, 1903 - November 1905N: 205 - Oct 13, 1903 - November 1905E: 130 - since November 1905N: 133 - since November 1905

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!