About K-NET ASCII format


The K-NET ASCII format is described below with an actual data file.
----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
Origin Time       2006/01/18 23:25:00<LF>         (1) Event origin time
Lat.              37.798<LF>                      (2) Event latitude
Lon.              142.200<LF>                     (3) Event longitude
Depth. (km)       36<LF>                          (4) Event depth
Mag.              5.7<LF>                         (5) Magnitude
Station Code      MYG002<LF>                      (6) Site code
Station Lat.      38.7262<LF>                     (7) Site latitude
Station Lon.      141.5109<LF>                    (8) Site longitude
Station Height(m) 79<LF>                          (9) Site altitude
Record Time       2006/01/18 23:25:46<LF>         (10) Recording start time
Sampling Freq(Hz) 100Hz<LF>                       (11) Sampling frequency
Duration Time(s)  108<LF>                         (12) Recording duration time
Dir.              N-S<LF>                         (13) Channel number
Scale Factor      3920(gal)/6182761<LF>           (14) Scale factor
Max Acc. (gal)    48.060<LF>                      (15) Maximum acceleration
Last Correction   2006/01/18 23:25:31<LF>         (16) Time of last correction
Memo.             <LF>                            (17) Comments
    8009     9006     7998     8001     8009     8007     8002     8005<LF>
    8006     8003     8003     8005     8005     8003     8001     8004<LF>
    8008     8004     7998     8002     8009     8005     8001     8002<LF>
 :
 :
 :
    8005     8003     8000     8004     8010     8008     8001     8001<LF>
    8006     8006     8000     8000     8005     8009     8004     7999<LF>
    8003     8007     8004     8000     8000     8005     8009     8005<LF>
[EOF]
----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
	
(Line 9th) Site altitude
The value of -9999 indicates that no site altitude data are available in database.

(Line 10th) Recording start time
This time includes the effect of 15-second trigger delay in the data logger. The true start time of the time series is obtained by subtracting 15 seconds from this "Recording start time."

(Line 13th) Channel number
The strong-motion data for K-NET sites have three data channels that correspond to three components of a seismograph. Relationship between the channels and the extension of the files are as follows.
Channel numberExtension of file
N-SNS
E-WEW
U-DUD

The strong-motion data for KiK-net sites have six channel numbers; the first three correspond to three components of a borehole seismograph and the other three correspond to those of a surface seismograph (see table below). Please note that channels 1 and 2 may be rotated from NS and EW directions due to the difficulty in adjusting the azimuth of sensors in the borehole. Orientations of Hi-net sensor, which are considered to be the same as those of KiK-net sensor installed in the same container, are available from the Hi-net website (in Japanese) and serve as a reference for KiK-net data.
Channel numberComponentLocationExtension of file
1NSBoreholeNS1
2EWBoreholeEW1
3UDBoreholeUD1
4NSSurfaceNS2
5EWSurfaceEW2
6UDSurfaceUD2

(Line 15th) Maximum acceleration
This value is obtained after the offset of data or the average value of all the data is subtracted.

Strong-motion data begin at line 18th.
Raw data of the seismograph are written as 7-digit integer with sign in eight columns per line. The acceleration time series is obtained by multiplying these data by the scale factor written in line 14th. As the data are provided without corrections, they may contain offsets.

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