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

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

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68 Ota Kulhdnek1 UPP EW SEP 9 1954 ALGERIA A 258 UPP EW ,OCT 10 1980 ALGERIA A 25 94Figure 3. Uppsala Wiechert seismograms (east-west components) <strong>from</strong> two majorearthquakes in nor<strong>the</strong>rn Algeria in 1954 (left) and 1980 (right). The processing steps areas follows (<strong>from</strong> bottom to top): (a) original record digitized at non-equal time intervals;(b) correction for <strong>the</strong> arm-pivot offset introduced; (c) correction for <strong>the</strong> finite arm lengthintroduced; (d) data interpolated and smoo<strong>the</strong>d. Time in seconds is given at <strong>the</strong> bottom of<strong>the</strong> figure. For <strong>the</strong> sake of comparison, amplitudes are adjusted to <strong>the</strong> same level. Relativeamplitudes are given at right edges of both top lines.UPP-EWnFigure 4. Comparison of corrected seismograms <strong>from</strong> <strong>the</strong> 1954 and 1980 earthquakesin nor<strong>the</strong>rn Algeria. Maximum amplitudes are adjusted to <strong>the</strong> same level.

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