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Arrival time data record format


Col. Type Item Description
01 A1 Record type identifier Data record type identifier
_: Observation data record
02 – 07 A6 Seismic station code Six-character JMA code for the seismic station
08 – 11 I4 Seismic station number Number of the seismic station
12 A1 Blank Blank
13 A1 Seismometer type Blank if the type is unknown. The following letters denote types:
A: 87-type electromagnetic strong-motion seismograph (acceleration)
B: 87-type electromagnetic strong-motion seismograph (velocity)
C: 87-type electromagnetic strong-motion seismograph (displacement)
D: 59-type (displacement, including 63-type)
E: 61-type (displacement), STS
F: Other JMA seismometer (acceleration)
G: Other JMA seismometer (velocity)
H: Other JMA seismometer (displacement)
J: Velocity type, local, buried sensor, with logarithmic amplifier
K: Velocity type, local, buried sensor
L: Velocity type, local, surface installation
M: Velocity type, remote, buried sensor
N: Velocity type, remote, surface installation
P: JMA OBS (acceleration)
Q: JMA OBS (velocity)
R: JMA OBS (displacement)
S: JMA mechanical strong-motion seismograph
T: 67-type velocity sensor with logarithmic amplifier (remote)
U: Other JMA seismometer (component unknown)
V: JMA installation in volcanic region (acceleration)
W: JMA installation in volcanic region (velocity)
Y: JMA installation in volcanic region (displacement)
Z: JMA strain, etc.
a: Displacement (two instances of numerical integration using acceleration seismograph, HPF 1 s)
b: Displacement (two instances of numerical integration using acceleration seismograph, HPF 3 s)
c: Displacement (two instances of numerical integration using acceleration seismograph, HPF 5 s)
d: Displacement (two instances of numerical integration using acceleration seismograph, HPF 10 s)
e: Displacement (two instances of numerical integration using acceleration seismograph, HPF 20 s)
f: Displacement (two instances of numerical integration using acceleration seismograph, HPF 6 s
reproducing mechanical strong-motion seismograph characteristics [S])
j: Displacement (two instances of numerical integration using seismic intensity-meter, HPF 6 s
reproducing mechanical strong-motion seismograph characteristics [S])
g: Velocity (numerical integration using acceleration seismograph, HPF 3 s)
n: Velocity (numerical integration using acceleration seismograph, HPF 1 s)
&: Other organization (acceleration)
%: Other organization, surface installation (velocity)
s: Other organization, bore-hole installation (velocity)
t: Other organization, horizontal-tunnel installation (velocity)
r: Other organization, OBS (velocity)
#: Other organization (displacement)
h: High-sensitivity seismometer with bore-hole installation (velocity)
?: Other organization (component unknown)
w: Other organization, broad-band (velocity)
o: JMA installation in volcanic region, bore-hole installation (velocity)
p: JMA installation in volcanic region (broad-band)
u: Installation in volcanic region (air vibration)
x: Overseas (velocity)
14 – 15 I2 Date
16 – 19 A4 Phase name Name of first phase
Blank if data are for the third or subsequent phases
20 – 21 I2 Arrival time (hours) Arrival time of first phase (hours)
22 – 23 I2 Arrival time (minutes) Arrival time of first phase (minutes)
24 – 27 F4.2 Arrival time (seconds) Arrival time of first phase (seconds)
28 – 31 A4 Phase Name Name of second or subsequent phase
32 – 33 I2 Arrival time (minutes) Arrival time of second or subsequent phase (minutes)
34 – 37 F4.2 Arrival time (seconds) Arrival time of second or subsequent phase (seconds)
38 – 42 I5 Maximum amplitude (ground displacement) Amplitude of N-S component
If the record saturated, "-1" is shown. "-" represents an absence of data.
43 – 45 F3.1 Period of maximum amplitude Period of N-S component corresponding to maximum amplitude (in seconds)
46 – 48 I3 Time of maximum amplitude occurrence Time of maximum amplitude occurrence from first phase in N-S component (seconds)
49 – 53 I5 Maximum amplitude (ground displacement) Amplitude of E-W component
54 – 56 F3.1 Period of maximum amplitude Period of E-W component corresponding to maximum amplitude (in seconds)
57 – 59 I3 Time of maximum amplitude occurrence Time of maximum amplitude occurrence from first phase in E-W component (seconds)
60 – 64 I5 Maximum amplitude (ground displacement) Amplitude of U-D component
65 – 67 F3.1 Period of maximum amplitude Period of U-D component corresponding to maximum amplitude (in seconds)
68 – 70 I3 Time of maximum amplitude occurrence Time of maximum amplitude occurrence from first phase in U-D component (seconds)
71 A1 Unit of maximum amplitude J or K: 10−9 m/s; 0.1 microkines
1 or A: 10−8 m/s; microkines
2 or B: 10−6 m; micrometers
3 or C: 10−5 m/s2; mgals
4 or D: 10−7 m/s; 10 microkines
5 or E: 10−5 m; 10 micrometers
6 or F: 10−4 m/s2; 10 mgals
7 or G: 10−6 m/s; 100 microkines
8 or H: 10−4 m; 100 micrometers
9 or I: 10−3 m/s2; 100 mgals
J and 1 – 9 are used for magnitude calculations, K and A – I are not used for magnitude calculations.
72 A1 Polarity of initial motion Polarity of initial motion in N-S component
73 – 75 I3 Amplitude of initial motion Amplitude of initial motion in N-S component
76 A1 Polarity of initial motion Polarity of initial motion in E-W component
77 – 79 I3 Amplitude of initial motion Amplitude of initial motion in E-W component
80 A1 Polarity of initial motion Polarity of initial motion in U-D component
81 – 83 I3 Amplitude of initial motion Amplitude of initial motion in U-D component
84 A1 Unit of initial motion amplitude As per unit of maximum amplitude
85 – 87 I3 Duration F−P time or total time for which STA or LTA exceeds threshold value (in seconds)
88 – 89 I2 Data year Last two digits of year
90 – 91 I2 Data month
92 A1 Data information flags Flag for first-phase information about filters and realiability.
Flag for High reliability
A: Auto pick-up phase (from original waveform)
B: Auto pick-up phase (HPF 0.5 s)
C: Auto pick-up phase (HPF 1.0 s)
D: Auto pick-up phase (HPF)
X: Auto pick-up phase (BPF 0.1 – 0.2 s)
E: Auto pick-up phase (BPF 0.1 – 0.5 s)
F: Auto pick-up phase (BPF 0.1 – 1.0 s)
W: Auto pick-up phase (BPF 0.2 – 0.5 s)
G: Auto pick-up phase (BPF)
H: Auto pick-up phase (LPF 0.1 s)
I: Auto pick-up phase (LPF 0.2 s)
J: Auto pick-up phase (LPF)
L: Auto pick-up phase (other)
M: Manual pick-up phase (from original waveform)
N: Manual pick-up phase (HPF 0.5 s)
O: Manual pick-up phase (HPF 1.0 s)
P: Manual pick-up phase (HPF)
Q: Manual pick-up phase (BPF 0.1 – 0.5 s)
R: Manual pick-up phase (BPF 0.1 – 1.0 s)
S: Manual pick-up phase (BPF)
T: Manual pick-up phase (LPF 0.1 s)
U: Manual pick-up phase (LPF 0.2 s)
V: Manual pick-up phase (LPF)
Z: Manual pick-up phase (other)

Flag for low reliability
a: Auto pick-up phase (from original waveform)
b: Auto pick-up phase (HPF 0.5 s)
c: Auto pick-up phase (HPF 1.0 s)
d: Auto pick-up phase (HPF)
x: Auto pick-up phase (BPF 0.1 – 0.2 s)
e: Auto pick-up phase (BPF 0.1 – 0.5 s)
f: Auto pick-up phase (BPF 0.1 – 1.0 s)
w: Auto pick-up phase (BPF 0.2 – 0.5 s)
g: Auto pick-up phase (BPF)
h: Auto pick-up phase (LPF 0.1 s)
i: Auto pick-up phase (LPF 0.2 s)
j: Auto pick-up phase (LPF)
l: Auto pick-up phase (other)
m: Manual pick-up phase (from original waveform)
n: Manual pick-up phase (HPF 0.5 s)
o: Manual pick-up phase (HPF 1.0 s)
p: Manual pick-up phase (HPF)
q: Manual pick-up phase (BPF 0.1 – 0.5 s)
r: Manual pick-up phase (BPF 0.1 – 1.0 s)
s: Manual pick-up phase (BPF)
t: Manual pick-up phase (LPF 0.1 s)
u: Manual pick-up phase (LPF 0.2 s)
v: Manual pick-up phase (LPF)
z: Manual pick-up phase (other)
93 A1 Data information flag Flag for second-phase information about filters and realiability.
94 A1 Data information flag Flag for maximum-amplitude information
P: Use of horizontal amplitudes for magnitude calculation regardless of their periods
95 A1 Data information flag Flag for information on other data
R: Additional reference information
96 A1 Data weight Data weight for calculation of hypocenter location
0: Not used for calculation of hypocenter location