obspy.io.kinemetrics - Evt format support for ObsPy

Evt read support for ObsPy.

This module provides read support for the Evt Kinemetrics data format. It is based on the Kinemetrics description of the format and the provided C code (Kw2asc.c (see “KW2ASC.SRC” File in /doc section)).

copyright: The ObsPy Development Team (devs@obspy.org), Henri Martin, Thomas Lecocq, Kinemetrics(c)
license: GNU Lesser General Public License, Version 3 (https://www.gnu.org/copyleft/lesser.html)

Reading

Similar to reading any other waveform data format using obspy.core:

>>> from obspy import read
>>> st = read("/path/to/BI008_MEMA-04823.evt", apply_calib=True)
>>> st  
<obspy.core.stream.Stream object at 0x...>
>>> print (st)  
3 Trace(s) in Stream:
.MEMA..0 | 2013-08-15T09:20:28.000000Z - 2013-08-15T09:20:50.996000Z |
250.0 Hz, 5750 samples
.MEMA..1 | 2013-08-15T09:20:28.000000Z - 2013-08-15T09:20:50.996000Z |
250.0 Hz, 5750 samples
.MEMA..2 | 2013-08-15T09:20:28.000000Z - 2013-08-15T09:20:50.996000Z |
250.0 Hz, 5750 samples

Each trace will have a stats attribute containing the usual information and a kinemetrics_evt dictionary with specific attributes.

Note

All the Header’s attributes are not read (can be implemented if necessary for someone.)

>>> stats_evt = st[0].stats.pop('kinemetrics_evt')
>>> print(st[0].stats)  
         network:
         station: MEMA
        location:
         channel: 0
       starttime: 2013-08-15T09:20:28.000000Z
         endtime: 2013-08-15T09:20:50.996000Z
   sampling_rate: 250.0
           delta: 0.004
            npts: 5750
           calib: 1.1694431304931641e-06
         _format: KINEMETRICS_EVT
>>> for k, v in sorted(stats_evt.items()):
...     print(k, v)
...     
a2dbits 24
batteryvoltage -134
chan_azimuth 0
chan_calcoil 0.05000000074...
chan_damping 0.70700001716...
chan_east 0
chan_fullscale 2.5
chan_gain 1
chan_id
chan_natfreq 196.0
chan_north 0
chan_range 3
chan_sensitivity 2.5
chan_sensorgain 1
chan_up 0
comment MEMBACH
duration 230
elevation 298
gpslastlock 2013-08-15T09:19:20.000000Z
gpsstatus Present ON
installedchan 4
instrument New Etna
latitude 50.609794616...
longitude 6.0092501640...
maxchannels 12
nchannels 3
nscans 6
samplebytes 3
serialnumber 4823
starttime 2013-08-15T09:20:28.000000Z
stnid MEMA
temperature 76
triggertime 2013-08-15T09:20:34.600000Z

The actual data is stored as numpy.ndarray in the data attribute of each trace.

>>> type(st[0].data)  
<... 'numpy.ndarray'>
>>> print(st[0].data)
[-0.02446475 -0.02453492 -0.02446709 ..., -0.02452556 -0.02450685
 -0.02442499]

Writing

Not implemented

Modules

core

Evt (Kinemetrics files) bindings to ObsPy's core classes.