2.4.l Summary record

            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
P - Preliminary, but location not finalized
F - Final location determine
G - National Earthquake Information Center (NEIC) solution
A - NEIC solution obtained from USGS/UAGI
N - Not of principal interest
I - Insufficient data to determine a hypocenter

            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 \
The primary SUMMARY record is always first and has a "/" in column 83. If an archive file has more than one SUMMARY record, the second and any subsequent records will have a "\" in column 83.

             

            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)

            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.

            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.

            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.
0 = high; 1 = gain times 1/10; 2 = gain times 1/500

             

            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.