obspy.io.nied.fnetmt - F-net’s moment tensors TEXT format support for ObsPy¶
This module provides read support for the moment tensor files (TEXT format) provided for the F-net broadband seismograph network operated by the National Research Institute for Earth Science and Disaster Prevention in Japan (NIED; http://www.fnet.bosai.go.jp/).
- copyright
The ObsPy Development Team (devs@obspy.org)
- license
GNU Lesser General Public License, Version 3 (https://www.gnu.org/copyleft/lesser.html)
Example¶
It works by utilizing ObsPy’s read_events()
function.
>>> import obspy
>>> cat = obspy.read_events("/path/to/FNETMTCATALOG")
>>> print(cat)
1 Event(s) in Catalog:
2011-03-11T05:46:18.120000Z | +38.103, +142.861 | 8.7 Mw
The event will contain a couple of origins and magnitudes.
>>> print(cat[0]) # doctest: +ELLIPSIS, +NORMALIZE_WHITESPACE
Event: 2011-03-11T05:46:18.120000Z | +38.103, +142.861 | 8.7 Mw
<BLANKLINE>
resource_id: ResourceIdentifier(id="smi:local/fnetmt/2011excpds/event")
event_type: 'earthquake'
preferred_origin_id: ResourceIdentifier(id="smi:local/fnetmt/2011excpds/origin#MT")
preferred_magnitude_id: ResourceIdentifier(id="smi:local/fnetmt/2011excpds/magnitude#MT")
preferred_focal_mechanism_id: ResourceIdentifier(id="smi:local/fnetmt/2011excpds/focal_mechanism")
---------
focal_mechanisms: 1 Elements
origins: 2 Elements
magnitudes: 2 Elements
obspy.io.nied.knet - K-NET and KiK-net ASCII format support for ObsPy¶
This module provides read support for the ASCII format for waveforms from the K-NET and KiK-net strong-motion seismograph networks operated by the National Research Institute for Earth Science and Disaster Prevention in Japan (NIED; http://www.kyoshin.bosai.go.jp/).
KiK-net stations consist of one borehole and one surface sensor which are distinguished by their channel names:
Channel name
Sensor type
Sensor orientation
NS1
Borehole
N
EW1
Borehole
E
UD1
Borehole
Z
NS2
Surface
N
EW2
Surface
E
UD2
Surface
Z
K-NET stations only have one surface sensor with the following channel naming conventions:
Channel name
Sensor orientation
NS
N
EW
E
UD
Z
- copyright
The ObsPy Development Team (devs@obspy.org)
- license
GNU Lesser General Public License, Version 3 (https://www.gnu.org/copyleft/lesser.html)
Example¶
Reading K-NET/KiK-net files is handled by using ObsPy’s
standard read()
function. The format is detected
automatically.
>>> from obspy import read
>>> st = read('/path/to/test.knet')
>>> print(st) # doctest: +ELLIPSIS
1 Trace(s) in Stream:
BO.AKT013..EW | 1996-08-10T... - 1996-08-10T... | 100.0 Hz, 5900 samples
Note that K-NET/KiK-net station names are 6 characters long. This will cause problems if you want to write MiniSEED as it only allows 5 character station names. In this case you can opt to write the last 2 characters of the station name into the location field. This is possible because the location is encoded in the channel name (see table above).
>>> st = read('/path/to/test.knet',convert_stnm=True)
>>> print(st) # doctest: +ELLIPSIS
1 Trace(s) in Stream:
BO.AKT0.13.EW | 1996-08-10T18:12... - 1996-08-10T... | 100.0 Hz, 5900 samples
Additional header entries from the K-NET/KiK-net file are written to a dictionary called ‘knet’:
>>> print(st[0].stats) # doctest: +ELLIPSIS, +NORMALIZE_WHITESPACE
network: BO
station: AKT0
location: 13
channel: EW
starttime: 1996-08-10T18:12:24.000000Z
endtime: 1996-08-10T18:13:22.990000Z
sampling_rate: 100.0
delta: 0.01
npts: 5900
calib: 2.3841857...e-06
_format: KNET
knet: AttribDict(...)
>>> print(st[0].stats.knet.stlo)
140.3213
>>> print(st[0].stats.knet.comment)
A dummy comment
- The meaning of the entries in the ‘knet’ dictionary is as follows:
Name
Description
evot
Event origin time (UTC)
evla
Event latitude
evlo
Event longitude
evdp
Event depth
mag
Event magnitude
stla
Station latitude
stlo
Station longitude
stel
Station elevation
accmax
Maximum acceleration (after baseline removal)
duration
Recording duration time [s]
comment
Comment
last correction
Time of last correction (Japanese standard time)