file: 002727xa.cor earthquake code: 990 station code: 694 waveform code: 2727 total number of channels: 3 orientation of transducer: NS instrument type: SMACH SM2 sensitivity: 20.00V/g natural frequency: 10.0Hz damping: 0.670 full scale amplitude: 0.50g resolution of A/D converter: 12bits fc of anti-alias filter: 30Hz poles of anti-alias filter: 5 instrument operator: Swiss Federal Institute of Technology, ... time of first sample: 31.12.1999 04:55:53.671UTC sampling period: 0.010000s number of samples: 3043 record length: 30.421s units: m/s*s, m/s & s reference: Winiger D. (2000): Written communication 27.1.2000. Swiss Seismological Service, ... comments & processing history: %- pre-processed by: Smit P., Imperial College, London, 2000 %- processed by: Smit P., Imperial College, London, 2000 %- transducer response already corrected by instrument %- 8th order elliptical bandpass-filter (0.25-25.00Hz) %- acceleration time histories filtered %- linear baseline of acceleration and velocity time histories corrected %- released on CD-ROM: Dissemination of European Strong-Motion Data, 2000 -> corrected acceleration time histories -0.12059E-05 -0.38627E-05 -0.67151E-05 -0.66337E-05 -0.10625E-06 0.78215E-05 ... (sample lines deleted) 0.40453E-03 -> corrected velocity time histories -0.29815E-05 -0.30068E-05 -0.30597E-05 -0.31265E-05 -0.31602E-05 -0.31216E-05 ... (sample lines deleted) 0.83948E-05 STOP
The file-structure of the uncorrected or corrected time histories and spectra as they are archived in the databank is as follow:
The following table gives a complete description of the format of the datafiles archived in the databank:
Parameter Description Validation Data Type RNAME (primary key) file name of the time history or spectra as it is archived
in the databank and primary key of the record associated with the
waveform-database cannot be missing A15 RECODE (primary key) primary key of the earthquake record archived in the
earthquake-database and associated with the time history or spectra cannot be missing I6 RSCODE (primary key) primary key of the station record archived in the
station-database and associated with the time history or spectra cannot be missing I6 RWCODE (primary key) primary key of the waveform record archived in the
waveform-database and associated with the time history or spectra cannot be missing I6 NCH total number of channels associated to this record cannot be missing I1 RCMP orientation of the transducer cannot be missing A4 INAME name of the accelerograph model missing value is unknown A30 ISEN, ISENU sensitivity and unit of the transducer missing value is 9.99 and blank F5.2, A8 IFRE, IFREU natural, undamped frequency and unit of the transducer missing value is 99.9 and blank F5.1, A2 IDAM damping of the accelerometer transducer, as a proportion
of critical missing value is 9.999 F6.3 IFSC, IFSCU full scale of the accelerometer transducer and unit missing value is 9.99 and blank F5.2, A1 IRES resolution of A/D converter in bits missing value is 9 I2 IFC, IFCU corner frequency of the anti-alias filter and unit for
digitally recorded data missing value is 99 and blank I3, A2 IPOL number of poles of the anti-alias filter for digitally
recorded data missing value is 9 I2 SIOP agency responsible for the operation of the accelerograph missing value is unknown A250 date and time of the first sample dd.MM.yyyy dd RDAY day of the year of the first sample 1 £ dd £ 31 cannot be missing I2 MM RMONTH month of the year of the first sample 1 £ MM £ 12 cannot be missing I2 yyyy RYEAR year of the first sample yyyy ³ 1933 cannot be missing I4 hh:mm:ss TMZ hh RHOUR hour of the day, on the 24-hour clock, of the first sample 1 £ hh <
24 cannot be missing I2 mm RMIN minutes of the hour of the first sample 1 £ mm <
60 cannot be missing I2 ss RSEC seconds of the hour of the first sample 0.0 £ ss <
60.0 missing value is 9.999 F6.3 TMZ RTMU timezone (usually UTC) cannot be missing A10 RPER, RPERU sampling period and unit for evenly sampled time history unevenly sampled: -1.0 cannot be missing F9.6, A3 number of samples time history spectra RNS number of accele- ration or velocity values SNP number of period values cannot be missing I5 / I3 SND number of damping values cannot be missing I2 RDUR total duration of digitised record in s cannot be missing F7.3 RUNIT units of the time history-, spectral-, time scale- and
period-values (usually m/s2, m/s & s) cannot be missing A30 RREF reference for the time history or spectra cannot be missing A250 PRC comment and processing history of the time history or
spectra %-string at column 1 40×A80 Sample array time history spectra sample header DMP 10 damping value cannot be missing F4.1 RT 50,000 time values if RPER= -1.0 PER 150 period values cannot be missing E12.5 / E11.3 RA 50,000 acceleration values SA 10×150 spectral acceleration cannot be missing E12.5 / E11.3 RV 50,000 Velocity values SV 10×150 spectral velocity cannot be missing E12.5 / E11.3 SD 10×150 spectral displacement cannot be missing E11.3 PSV 10×150 pseudo spectral velocity cannot be missing E11.3 REOF EOF-marker STOP cannot be missing A4
The following figure shows the distribution of strong-motion records with respect to the trigger date and
type of recording instrument:
Notes on parameters of datafiles:
Filename
The first six characters of the filename of the uncorrected and corrected time histories and
response spectra represent the primary key of the waveform-record associated to the record.
The next character is a letter referring to the orientation of the transducer azimuth, either
X or Y, for the horizontal and Z for the vertical. The last character of the filename separates
different versions of digitisation or processing of the same time histories. The extension of
the datafile reflects the datatype:
RAW: uncorrected time histories.
COR: corrected time histories,
SPC: response spectra.
Component Direction
The component direction was taken as they were indicated in the header of the original datafiles or as
they were reported by the instrument-operators. We did not verify or, if necessary, correct all
component direction of all 3,188 individual records. It is therefore recommended to check carefully the
component direction if specific positive or negative directions is needed.
Instrument Characteristics
It was not uncommon to have no knowledge of the specific characteristics of the instrument (sensitivity,
natural frequency and damping of the transducers, characteristics of the recording instruments, etc.),
particularly for the case of old instruments or instruments that have been moved or abandoned, and for
temporary stations.
Date and Time of the First Sample
We often could not find any information about the exact date and time of the first sample of the records.
If no time information was given, the date and time was set to the source date and time whereas the seconds
of the hour of the first sample, RSEC, was set to -9.999. The user is cautioned when using this time
information if only the full seconds are given or RSEC is set to -9.999.
Reference
The reference cited in the header of the datafiles and in the waveform-database represents our best available
resource for the original time histories and associated parameters. In some cases the reference may be
superseded by later work.