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Sesame H/V software: main processing module HVPROC

The main processing module performs the basics analses de!oted to the estimation of H/V ratio"

The principal steps e#ecuted b the code are the following:

$" Reading of input time histories

%" Offset remo!al

&" 'or each selected time window inside time histories

a" Tapering

b" ''T

c" Smoothing of 'ourier spectra

d" (erging of hori)ontal components

e" H/V ratio

f" Optional output of single window H/V and spectra

*" Optional output of a!erage spectra

+" ,!erage of H/V-" Computation of '.according to P.% scheme

0" 1eneral output

The code is automaticall in!o2ed inside the 34S5S,(5 pac2age but it can also be run as a

command line call in the following wa :

Hvproc0_1 winfile parfile outfile

winfile is the file which lists the time window to be analsed

parfilecontains the parameters for the processing

outfile is the name of the general output file

winfile

This file lists the selected windows used for the processing" Such windows ma automaticall be

chosen b the 6window selection7 module"

The winfile structure is as follows:

D:\Sesame\Data\file1.gse 5.1 19.3 1 EH EH! EHE "S"D:\Data\file#.saf 0.1 1$.3 #D:\Data\file3.cts 1#3.0 13%.# 3

here:

Column $: &d time histor file name

Column %: beginning of selected time window 8in seconds from the first sample of the file9

Column &: end of selected time window 8in seconds from the first sample of the file9

Column *: format identifier 8$ 1S5; % S,'; & Cit Shar29 8

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8ata can come either from different sections of the same time histor or from different timehistories@ the onl constrain is that the sampling rate should be unchanged"

,lthough it would no be ad!isable@ time window lengths can be different" The code will set the

time duration for the analses as the ma#imum found and pad with )eros the shorter windows"

parfile

?n this file the parameters needed for the processing are listed@ the code considers the section of the

file between the following two lines:

BBB section processing

BBB end processing

Comment lines begin with a AB character"

The options for the processing are the following:

$" 'reDuenc spacing" The output !alues of H/V ratio and spectra are computed for the

freDuenc !alues defined b this option"s&nta':fre(_spacing:)t&pe*+:)arg1*:)arg#*:)arg3*,

t&pe arg1 arg# arg3fft - - -

fft_re f_min f_ma' -linear f_min f_ma' /_pointslog f_min f_ma' /_points

?n some cases the code has to modif the limit set b the user@ a warning is then issued"

%" Offset remo!al" The offset can be computed either on the entire record or on each selected

window Eall; winF" High pass filtering is performed on the entire record Ehigh4passFs&nta':offset_rem:)t&pe*+:)arg*,t&pe arg1 arg# no - -

r_mean all - r_mean win - ig-pass fre(uenc& -

an-pass fre(uenc&_1 fre(uenc&_#

&" Tapering" ?t can be set the percentage of the window that is affected b the tapering on both

ends" 8o'carstands for no taper;cosstands for 6Hanning7 tapering9s&nta':taper:)t&pe*+:)arg*,t&pe arg1o'car -cos percentage

*" Smoothing" The raw !alues of 'ourier spectra are smoothed before the computation ofH/V ratio" hen the smoothing window reDuires !alues of the raw spectrum outside the

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range .4'GDuist@ then the smoothed spectrum will be restricted to the significant

freDuenc inter!al"s&nta':smoot:)t&pe*:+)arg1*+:)arg#*,,t&pe arg1 arg#none - - 21

linear anwit o' 2#linear anwit tri 23log percentage o' 2$log percentage tri 254onno-omaci anwit 2

1. 6aw 77" values are retaine#. Smooting wit constant weigt in te interval +f-w8# fw8#,3. Smooting wit triangular weigt over te linear interval +f-w8#

fw8#,$. Smooting wit constant weigt over te log interval +f821p8100

f21p8100,5. Smooting wit triangular weigt over te log interval +f821p8100

f21p8100,. Smooting wit ;onno-

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>efault !alues

The following default !alues are used in the processing in case the corresponding parameter is not

set in parfile

fre(_spacing:fft offset_rem:r_mean:all

taper:cos:5

smoot:4onno-omaci:$0

merge_t&pe:(uaratic

single_win_out:no

average_spectra_out:no

outfile

This file lists:

The windows used in the processing

The parameters used in the processing

umber of windows and number of freDuenc !alues

'.and the range correspondent to J/4 $ s"d"

The !alues of the a!erage HV and corresponding s"d" for each freDuenc !alue:

freDuenc mergedGHV nsGHV ewGHV mergedGHVGsd nsGHVGsd ewGHVGsd

a" Currentl if merge_t&pe:comple' thenmergedGHV nsGHV ewGHV

b" Value of H/V corresponding to $ s"d ##GHV < ##GHVGsd

34Sesame automaticall define the output file name 8which is the same as the input "saf or "gse file

with the e#tension 6"out79@ if the same input file is reprocessed@ the output file will be o!erwritten"

>imension

Currentl the code can read time histories with number of samples per channel up to -.....@ the

processing can be performed with 8appro#imatel9 nGfreD

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S,' 'OR(,T

The S5S,(5 ,SC?? file is organi)ed in &4columns that correspond to & output channels of a

single sensor" The first column refers to the !ertical component the second and third to the

hori)ontal ones which are supposed to be deploed at L. degrees between each other"

The first section of the S5S,(5 ,SC?? includes an header containing some mandator andoptional parameters" 5ach parameter@ onl one in a row@ is specified b means of a 2eword

followed b 67 and then b the !alue of the parameter itself" 8i"e" : nat > 1#3$.

Therefore the structure of such S5S,(5 data file is:

'irst line : MSES@AE @SBCC ata format 2saf v. 1M

Header information

o 5mpt lines are allowed

o Comments can be added pro!ided that the first character in the row is MBM

o Newords are not case sensiti!eo Separator between 2ewords and their !alues is MM

o The order of the 2ewords is irrele!ant

o lan2s can be added e!erwhere

>ata begin after this separator line : M////--------------------M

>ata are written in three columns free format

Column $ must correspond to the Vertical channel@ columns % and & to the hori)ontal

ones

(andator 2ewords are :

S"@_B