To save space no decimal points are used. Use the FORTRAN format for reading the summary record given below.
|
Item |
Column Nos. |
Format for Reading |
|
|
Origin Time: |
|
|
|
|
KDATE - year, month, day (e.g. 19981231) |
1 |
8 |
i8 |
|
KHRMN - hour, minute (e.g. 2358) |
9 |
12 |
i4 |
|
KSEC - (seconds) |
13 |
16 |
F4.2 |
|
LAT (degrees) |
17 |
18 |
i2 |
|
N or S |
|
19 |
A1 |
|
LAT (minutes) |
20 |
23 |
F4.2 |
|
LON (degrees) |
24 |
26 |
i3 |
|
E or W |
|
27 |
A1 |
|
LON (minutes) |
28 |
31 |
F4.2 |
|
DEPTH (km) [If negative, reset to -00] |
32 |
36 |
F5.2 |
|
PREFERRED MAGNITUDE |
37 |
38 |
F2.1 |
|
NO - Number of P, S, and S-P readings used in the solution |
39 |
41 |
i3 |
|
GAP - Largest azimuthal separation in degrees between stations as seen from the epicenter (deg.) |
42 |
44 |
i3 |
|
D1 - Distance to closest station used in solution (km) |
45 |
47 |
F3.0 |
|
RMS (s) |
48 |
51 |
F4.2 |
|
Azimuth of axis 1 of error ellipsoid (deg) |
52 |
54 |
i3 |
|
Dip of axis 1 (deg) |
55 |
56 |
i2 |
|
SE - length of ellipsoid semi-axis 1 (km) |
57 |
60 |
F4.2 |
|
Azimuth of axis 2 of error ellipsoid (deg) |
61 |
63 |
i3 |
|
Dip of axis 2 (deg) |
64 |
65 |
i2 |
|
SE - length of ellipsoid semi-axis 2 (km) |
66 |
69 |
F4.2 |
|
Average XMAG |
70 |
71 |
F2.1 |
|
Average FMAG |
72 |
73 |
F2.1 |
|
Processing state (not used by HYPOELLIPSE) |
|
74 |
A1 |
|
* - More data
available to be added |
||||||
|
SE - length of ellipsoid semi-axis 3 (km) |
75 |
78 |
F4.2 |
|||
|
Quality - either error-ellipsoid quality or HYPO quality depending upon QUALITY OPTION record. (See 2.2.3.4) [In reformatted NEIC data this column contains the depth quality indicator.] |
|
79 |
A1 |
|||
|
MAGTYP - F, X, A, or K to indicate which type of magnitude is entered in columns 37-38. (See 2.2.3.3 and 2.2.17) |
|
80 |
A1 |
|||
|
NSWT - Number of S-phase arrivals used in solution. |
81 |
82 |
i2 |
|||
|
/ or \ |
|
83 |
A1 |
|||
|
First 4 characters of INSTRUCTION record |
84 |
87 |
A4 |
|||
|
Month earthquake was run |
88 |
89 |
i2 |
|||
|
Year earthquake was run |
90 |
91 |
i2 |
|||
|
Event type |
|
92 |
A1 |
|||
|
E or blank |
local or regional earthquake |
S |
artificial source such as seismic line or shot |
|||
|
T |
teleseism |
O |
other non-earthquake (e.g. sonic boom or lightning)
|
|||
|
R |
regional (poor coverage; use solution from another organization) |
C |
calibration signal |
|||
|
N |
nuclear explosion |
A |
volcano tectonic (VT) |
|||
|
G |
glacial event |
B |
volcano long-period (LP) |
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|
Q |
quarry or mine explosion |
X |
emergent, low frequency near volcano, |
|||
|
F |
false trigger |
V |
volcano tremor burst or eruption |
|||
|
I |
Augustine volcano shore-ice event |
H |
volcano VT-LP hybrid |
|||
|
+ |
continuation of previous event |
|
|
|||
|
For type T, R, or N, do not compute the hypocenter location, but instead compute the azimuth and apparent velocity across the network. |
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|
Once the event type has been placed on the SUMMARY record of an earthquake in archive format, it will be transferred to succeeding SUMMARY records generated by later runs of HYPOELLIPSE. |
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|
Fixed location indicator, from column 19 of INSTRUCTION record or imposed by SELECT DELAY option (2.2.3.6) |
|
93 |
i1 |
|||
|
Sequence number |
94 |
98 |
A5 |
|||
|
S-P time at closest station used in solution. Blank if either P or S is not used. Set to 9999 if S-P .GE. 100. |
99 |
102 |
F4.2 |
|||
|
ZUP - Computed with GLOBAL OPTION. |
103 |
104 |
F2.0 |
|||
|
ZDN - Computed with GLOBAL OPTION. |
105 |
106 |
F2.0 |
|||
|
Vp/Vs - Computed slope of Ts vs Tp. Only computed if TEST(49) is not equal 0. |
107 |
110 |
F4.2 |
|||
|
Number of readings weighted out due to Jeffrey's, truncation, or boxcar weighting. |
111 |
112 |
i2 |
|||
|
DEPTH (km) [Allowed to be negative] |
113 |
117 |
F5.2 |
|||
The ARCHIVE-PHASE FILE may be used as a HYPOELLIPSE input phase file. In that case, the starting location, depth, and origin time will be taken from the first SUMMARY record associated with the event unless overridden by a location, depth, or origin time on the INSTRUCTION record (section 2.2.6.3). The format specification for reading an ARCHIVE ARRIVAL TIME record is as follows:
|
Item |
Col. Nos. |
Format |
||
|
Station code |
1 |
4 |
A4 |
|
|
Any two alphanumeric symbols to describe P phases. See 2.2.6.2) |
5 |
6 |
A2 |
|
|
First motion direction of P arrival |
|
7 |
A1 |
|
|
c, C, u, or U |
Compression |
|||
|
d, D |
Dilatation |
|||
|
+ |
Questionable compression |
|||
|
- |
Questionable dilatation |
|||
|
n, N |
Noisy |
|||
|
.or Blank |
Not readable |
|||
|
z, Z |
Nodal, and not clearly up or down |
|||
|
P-weight-code |
|
8 |
F1.0 |
|
|
0 or blank |
Full weight |
|||
|
1 |
Partial weight |
|||
|
2 |
Partial weight |
|||
|
3 |
Partial weight |
|||
|
4, 5, 6, 7, 8 |
No weight |
|||
|
9 |
Use S-P interval (see 2.2.9) |
|||
|
If the P phase is a secondary arrival refracted along the bottom of the Ith layer, type the value of I here. If event is in the (I + 1)th layer, a direct wave calculation will be made. Below that, the weight is reset to zero. |
|
9 |
i1 |
|
|
Year, month, day, hour, minute (e.g. 9812312358) |
10 |
19 |
i10 |
|
|
Seconds of P arrival |
20 |
24 |
F5.2 |
|
|
Distance (km)* |
25 |
28 |
F4.1 |
|
|
AZM - Azimuth from epicenter to station (degrees)* |
29 |
31 |
F3.0 |
|
|
Seconds of S arrival |
32 |
36 |
F5.2 |
|
|
S remark |
37 |
39 |
A3 |
|
|
S-weight-code |
|
40 |
F1.0 |
|
|
AIN - Angle of ray leaving hypocenter (degrees)* |
41 |
43 |
F3.0 |
|
|
Maximum peak-to-peak amplitude. Values from .001 to 9,999 are entered as positive. Negative entries are multiplied by -10,000 to allow for values of 10,000 to 9,990,000. |
44 |
47 |
F4.0 |
|
|
Period of maximum amplitude (s). If left blank, the standard period as specified in the station list will be used |
48 |
50 |
F3.2 |
|
|
P travel-time computed* |
51 |
54 |
F4.2 |
|
|
P standard error* |
55 |
57 |
F3.2 |
|
|
D, B, M, J, X, R, G, or * weight-code (See 2.3.7 for definition)* |
|
58 |
A1 |
|
|
Instrument Period (S=short, L=long, B=broad) |
|
59 |
A1 |
|
|
Instrument Gain (H=high, L=low) |
|
60 |
A1 |
|
|
Siemens gain state: 0 = high; 1 = low (gain times 1/4) |
|
61 |
i1 |
|
|
A1VCO gain range state. |
|
62 |
i1 |
|
|
Remark (Recorder location in column 63, e.g. F=Fairbanks) |
63 |
64 |
A2 |
|
|
Corrected first-motion symbol |
|
65 |
A1 |
|
|
Time correction (s) |
66 |
70 |
F5.2 |
|
|
F-P time interval (s) for FMAG |
71 |
75 |
F5.0 |
|
|
P:RES - Residual of P arrival (s)* |
76 |
80 |
F5.2 |
|
|
S standard error* |
81 |
83 |
F3.2 |
|
|
D, B, M, J, X, R, G, or "*" weight-code* |
|
84 |
A1 |
|
|
S:RES - Residual of S arrival (s)* |
85 |
89 |
F5.2 |
|
|
P delay* |
90 |
92 |
F3.1 |
|
|
S delay* |
93 |
95 |
F3.1 |
|
|
P elevation delay* |
96 |
98 |
F3.1 |
|
|
System response code* |
99 |
100 |
i2 |
|
|
XMAG* |
101 |
102 |
F2.1 |
|
|
FMAG* |
103 |
104 |
F2.1 |
|
|
Polarity source code** |
|
105 |
A1 |
|
|
P-arrival source code** |
|
106 |
A1 |
|
|
S-arrival source code** |
|
107 |
A1 |
|
|
Amplitude source code** |
|
108 |
A1 |
|
|
Coda-duration source code** |
|
109 |
A1 |
|
|
Number of satellite hops (NHOP) in telemetry path, each producing a delay of 0.27 s. (If the P-arrival and S arrival sources are not the same, then NHOP is set according to the P-arrival source.) * |
|
110 |
i1 |
|
* These items are added to the original ARRIVAL TIME record, but are not used in subsequent runs of HYPOELLIPSE
** See 4.2.2.2 for a listing of source codes.
Use of Polarity Source Code by HYPOELLIPSE:
STATION records have two fields for keeping track of station polarity (see 2.2.5), the Polarity-Reversal-Indicator in column 34 and the Tape-Polarity-Reversal-Indicator in column 48, and these two indicators do not always agree. The Polarity-Reversal-Indicator is used in correcting the observed first motion unless the polarity source code is S, in which case the Tape-Polarity-Reversal-Indicator is used.