def txt2sac(txt,output_dir = os.getcwd()):
''' This function will convert txt file to SAC file'''
with open(txt,encoding='iso-8859-9') as eqfile:
if os.stat(txt).st_size == 0:
print(txt + ' is empty')
return
head = [next(eqfile) for x in range(14)]
head = [line.rstrip('\n') for line in head]
hd = AttribDict()
hd['sac'] = AttribDict()
# Retrieve Event Information
# Retrieve EventTime
s = ''.join(i for i in head[2] if i.isdigit())
evtime = datetime.strptime(s, '%Y%m%d%H%M%S%f')
# Retrieve EVLA, EVLO
_,coors = head[3].split(':')
# Remove space, N and E
coors = coors.replace(' ','')
coors = coors.replace('N','')
coors = coors.replace('E','')
evla,evlo = coors.split('-')
hd['sac'].evla = float(evla.replace(',','.')); hd['sac'].evlo = float(evlo.replace(',','.'))
# Retrieve EVDP
_,depth = head[4].split(':')
evdp = depth.replace(' ','')
hd['sac'].evdp = float(evdp)
# Retrieve MAG
_,mags = head[5].split(':')
# Check if multiple Magnitude types are associated with the earthquake
if ',' in mags:
mag,imagtyp = mag_seperator(mags)
hd['sac'].imagtyp = imagtyp
else:
_, mag,imagtyp = mags.split(' ')
hd['sac'].imagtyp = mag_type(imagtyp)
hd['sac'].mag = float(mag.replace(',','.'))
# Retrieve Station Information
# Assign Network
hd['network'] = 'TK'
# Assing Location
hd['location'] = 00
# Retrieve KSTNM
_,stnm = head[6].split(':')
kstnm = stnm.replace(' ','')
hd['station'] = kstnm
# Retrieve STLA, STLO
_,coors = head[7].split(':')
# Remove space, N and E
coors = coors.replace(' ','')
coors = coors.replace('N','')
coors = coors.replace('E','')
stla,stlo = coors.split('-')
hd['sac'].stla = float(stla.replace(',','.')); hd['sac'].stlo = float(stlo.replace(',','.'))
# Retrieve STEL
_,el = head[8].split(':')
stel = el.replace(' ','')
hd['stel'] = float(stel.replace(',','.'))
# Retrieve Record Information
# Retrieve Recordtime
s = ''.join(i for i in head[11] if i.isdigit())
starttime = datetime.strptime(s, '%d%m%Y%H%M%S%f')
hd['starttime'] = UTCDateTime(starttime)
hd['sac'].o = UTCDateTime(starttime) - UTCDateTime(evtime)
# Retrieve NPTS
_,nptss = head[12].split(':')
npts = nptss.replace(' ','')
hd['npts'] = int(npts)
# Retrieve DELTA
_,dt = head[13].split(':')
delta = dt.replace(' ','')
hd['delta'] = float(delta.replace(',','.'))
hd['sampling_rate'] = 1/hd['delta']
hd['endtime'] = hd['starttime'] + hd['npts']*hd['delta']
hd['sac'].lcalda = 1; hd['sac'].lovrok = 1
eqfile.close()
# Read Waveform
with open(txt,encoding='iso-8859-9') as eqfile:
wfs = eqfile.readlines()[18:]
wfs = [line.rstrip('\n') for line in wfs]
wfs = [line.split(' ') for line in wfs]
wfs = [list(filter(None, line)) for line in wfs]
e = []; n = []; z = [];
for line in wfs:
n.append(line[0])
e.append(line[1])
z.append(line[2])
#East
tracee = Trace(np.asarray(e))
hd['channel'] = 'HGE'
tracee.stats = hd
st = Stream(traces=[tracee])
st.write(os.path.join(output_dir,st[0].id + '.SAC'), format='SAC')
#North
tracen = Trace(np.asarray(n))
hd['channel'] = 'HGN'
tracen.stats = hd
st = Stream(traces=[tracen])
st.write(os.path.join(output_dir,st[0].id + '.SAC'), format='SAC')
#Vertical
tracez = Trace(np.asarray(z))
hd['channel'] = 'HGZ'
tracez.stats = hd
st = Stream(traces=[tracez])
st.write(os.path.join(output_dir,st[0].id + '.SAC'), format='SAC')
return
