FN Archimer Export Format
PT J
TI On the Extraction of Microseismic Ground Motion from Analog Seismograms for the Validation of Ocean-Climate Models
BT 
AF Lecocq, Thomas
   ARDHUIN, Fabrice
   Collin, Fabienne
   Camelbeeck, Thierry
AS 1:1;2:2;3:1;4:1;
FF 1:;2:;3:;4:;
C1 Seismology–Gravimetry, Royal Observatory of Belgium, Brussels, Belgium
   University of Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM, Brest, France
C2 OBSERV ROYAL BELGIQUE, BELGIUM
   CNRS, FRANCE
UM LOPS
IN WOS Cotutelle UMR
   copubli-europe
IF 3.754
TC 11
UR https://archimer.ifremer.fr/doc/00620/73196/72555.pdf
LA English
DT Article
AB We report on a pilot demonstration of the usefulness of analog seismograms to improve the database of ocean storms before the 1980s by providing additional data for the quantitative validation of ocean wave modeling, in particular for extreme events. We present a method for automatic digitization of paper seismograms to extract microseismic ground‐motion periods and amplitudes. Each minute of the original paper records is scanned and vectorized. The amplitudes are calibrated based on the original metadata taken from official bulletins. The digitized time series is processed to extract power spectral densities, which are compared with modeled microseisms levels computed using a numerical ocean wave model. As a case study, we focus on one month of data recorded at the Royal Observatory of Belgium (ROB) from January to February 1953, around the “Big Flood” event, a tragic storm surge that flooded the lowlands of England, the Netherlands, and Belgium on 1 February 1953. The reconstructed spectrograms for the three components of ground motion show clear storm signatures that we relate to specific sources in the North Atlantic Ocean. However, our models of the Big Flood event based on these data do not result in the expected amplitudes as modeled compared to the observational data when the storm reached its maximum in the southern North Sea. We suggest that the source of microseisms recorded at ROB is related to the primary microseism generated in the North Sea, at periods of 7–8 s. Other discrepancies identified suggest small modifications of the source locations or energy. Reconstructed horizontal and vertical ground motions are coherent. This is a good news for the purpose of present‐day analyses of constructing twentieth century ocean‐climate models, especially as during much of that time only horizontal seismographs were installed at observatories. 
PY 2020
PD MAY
SO Seismological Research Letters
SN 0895-0695
PU Seismological Society of America (SSA)
VL 91
IS 3
UT 000530707300021
BP 1518
EP 1530
DI 10.1785/0220190276
ID 73196
ER

EF