The program MAGRES is used to calculate different statistics related to magnitudes and magnitude residuals for all currently used magnitudes in SEISAN.

Calculate average station resuduals for all stations and components. A subselection can be made to use only some components. Thre are options to use a range of magntudes and only make an average if a given number of residuals are available. This can be used to check a data set for stations with a magnitude bias. In addition, if magnitudes are available on all 3 components, the average difference in magnitude between vertical and horizontal components are calculated. This can be used to find if there is a bias using vertical component instead of horizontal component. It is mostly useful for Ml.

For a single station, the magnitude residual can be calculated as a function of time. This is an usefull option for detectiong gain changes at a station.

For a given magnitude using period, the statistics of periods is calculated for all stations with a period and a residual.

The statistics of the distribution of all residuals are always printed out and also the residuals as a function of distance.

The program only works with Nordic2 format, which has the magnitude residual in the S-file after it has been updated. So if data is in Nordic format, transfer to Nordic2 with NOR2NOR2, relocate the events and run the program on the hyp.out file.

The options for making the comparison for a subset of data (line minimum number of data) comes out in a separate file.

Below is an example:

magres Magnitude type: L, C, b, B, s, S or W b Other selection criteria for 2. output: y/n=enter y Average absolute residual range, enter for all Minimum number of residuals for average, enter for all Component to use, Z, N or E, if blank use all Accept blank component (y=enter/n) Station to use for residual vs time, if blank do not do EFI Only list first entry from a station(y/n=enter) Event data input - select one: SEISAN default data base or :Enter Alternative data base, give 1-5 letter code or : Local index file, name must start with index or : Local data base, write ,, or : Filename for one file, min. 6 chars or with a . : test1.hyp 2011 0101 0956 58.7 R -26.851 -63.237 584.FFISC999 3.9 6.7bBER 6.7bISC 2011 0102 2020 18.2 R -38.391 -73.399 23.0FFISC999 2.0 6.2LBER 7.0sBER 6.5bISC 2011 0109 1003 43.9 R -19.274 168.379 20.7FFISC999 2.1 6.4sBER 6.3SBER 6.0bISC 2011 0112 2132 54.9 R 26.967 140.016 524.FFISC999 2.5 6.3bBER 6.2bISC 2011 0113 1616 42.9 R -20.604 168.585 14.8FFISC999 2.1 7.0sBER 6.9SBER 6.7bISC 2011 0117 1920 57.9 R -5.104 102.602 39.1FFISC999 3.5 5.8sBER 5.5SBER 6.1bISC 2011 0118 2023 25.0 R 28.683 63.995 79.9FFISC999 2.0 8.0LBER 6.7bBER 6.8bISC 2011 0124 0245 31.0 R 38.402 72.847 102.FFISC999 2.0 7.2LBER 6.0bBER 6.0bISC End of s-file Analysis for 1207 channels. It might take some time ATAH ATAH EFI S ZEFI S ZEFI EFI PTGA PTGA ROSC ROSC RCBR RCBR HOPE HOPE SDV SDV PAYG PAYG PMSA PMSA BCIP BCIP FDF S ZFDF S ZFDF FDF JTS JTS TRIS TRIS SEUS SEUS SABA SABA ANWB ANWB SMRT SMRT OBIP OBIP ..... ..... Number of events in input file or data base 8 Number of channels with mag 1207 Number of stations with mag 1009 Number of stations with magnitudes on Z,N and E 0 Total number of periods for chosen magnitude 4055 Output file name is magres_all.out for all stations Output file name is magres_selected.out for selected stations Output of histogram, all residuals, is magres_histogram.out Output file with histogram data of periods is magres_period.out Output of residuals vs time for one station magres_time_EFI.out Output of residuals vs distance, all data is magres_distance.out

The file magres_all.out lists all residuals independent of selection critria while the selected ones are in file magres_selected.out. An example of magres_all.out:

Residuals for magnitude type b STAT COM N AV SD LAT LON ELEVA CASY BHZ 4 0.12 0.12 -66.279 110.536 154.000 FORT BHZ 3 0.17 0.29 -30.779 128.059 165.000 RPZ HHZ 3 0.17 0.08 -43.715 171.054 453.000 THZ HHZ 3 0.01 0.17 -41.763 172.905 747.000 MORW BHZ 5 0.10 0.09 -29.068 116.040 296.000 WR0 BHZ 4 0.08 0.21 -19.960 134.540 353.000 WRA 7 -0.23 0.23 -19.943 134.339 419.000

The file also has the location of the stations so it can be used for making a map with the residuals.

The magres_distance.out lists the distance in km vs the residual. If agency is available, it is also givern. All data is used.

2235.000 -0.74 2527.000 0.08 MOS 2527.000 0.04 GFZ 2527.000 0.09 NEI 2710.000 0.07 MOS 2733.000 0.34 NEI 2986.000 -0.32 3017.000 0.52 NEI 3262.000 0.14 MOS 3262.000 0.14 NEI 3369.000 0.24 MOS 3369.000 -0.10 GFZ

The file magres_histogram.out gives the statistics. Only magnitude residual between -1 and 1 are counted since it is assumed that larger residuals are errros.

-1.00000000 34 -0.899999976 83 -0.800000012 53 -0.699999988 109 -0.600000024 113 -0.500000000 195 -0.400000006 248 -0.300000012 288 -0.200000003 350 -0.100000001 383 0.00000000 401 0.100000001 351 0.200000003 351 0.300000012 284 0.400000006 231 0.500000000 201 0.600000024 124 0.699999988 55 0.800000012 53 0.899999976 19 1.00000000 20

The file station magres_time_EFI.out gives the resuals as a function of time for the selecte station EFI.

2011.08606 -0.419999987 2011.08606 0.550000012 2011.11890 -9.00000036E-02 2011.11890 5.99999987E-02

The file magres_period.out give the period statistics.

0.200000003 2 0.300000012 7 0.400000006 29 0.500000000 28 0.600000024 71 0.699999988 143 0.800000012 356 0.899999976 497 1.00000000 576 1.10000002 474 1.20000005 312 1.29999995 270 1.39999998 252 1.50000000 174 1.60000002 166 1.70000005 109 1.79999995 130 1.89999998 79 2.00000000 70 2.09999990 43 2.20000005 32 2.29999995 42 2.40000010 25 2.50000000 45 2.59999990 19 2.70000005 22 2.79999995 49 2.90000010 17 3.00000000 16

It is seen that most periods are at 1.0 s as expected for mb.