Gather seismic data and metadata from web services using Julia.
Seisrequests allows you to easily create a request for seismic data which you can then pass to any server round the world which supports either the FDSN or IRIS web services specifications. Examples include IRIS itself and the EU's data repository Orfeus.
You can search for seismic waveform data, earthquake locations and station information amongst other things.
Add SeisRequests on v0.7 of Julia and upwards like so:
julia> import Pkg; Pkg.add("https://github.com/anowacki/SeisRequests.jl")(On v0.6 and older, instead run
Pkg.clone("https://github.com/anowacki/SeisRequests.jl"))
Create requests of the kind you like using one of the constructors:
- Using the FDSN Web Services standard:
FDSNEvent: Query for eventsFDSNStation: Look for stationsFDSNDataSelect: Request waveform data
- Using the IRIS Web Services standard:
IRISTimeSeries: Requests waveform data
Each of these constructors has comprehensive documentation you can access
in the REPL by typing, e.g., ?FDSNEvent.
These requests can then be passed to the get_request function, which returns
a HTTP.Messages.Response containing the information sent by the server.
SeisRequests doesn't itself yet process this information further, which is up to the user.
For example, let's try and find information about the high-gain channels of the UK station in Jersey:
julia> using SeisRequests
julia> req = FDSNStation(station="JSA", network="GB", channel="?H?", level="channel", format="text")
FDSNStation
starttime: Missing missing
endtime: Missing missing
startbefore: Missing missing
startafter: Missing missing
endbefore: Missing missing
endafter: Missing missing
network: String "GB"
station: String "JSY"
⋮
matchtimeseries: Missing missing
format: String "text"
nodata: Int64 204
julia> get_request(req)
[ Info: Request status: Successful request, results follow
HTTP.Messages.Response:
"""
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
access-control-allow-origin: *
content-disposition: inline; filename="fdsnws-station_2018-08-23T13:37:35Z.txt"
Content-Type: text/plain
Content-Length: 176
Date: Thu, 23 Aug 2018 13:37:35 GMT
Connection: close
#Network | Station | Latitude | Longitude | Elevation | SiteName | StartTime | EndTime
GB|JSA|49.1878|-2.171698|39.0|ST AUBINS, JERSEY|2007-09-06T00:00:00|2599-12-31T23:59:59
"""If we want to get some data from here, we can ask for SAC data and read the response using the SAC module, then plot it up using SACPlot:
julia> using Dates, SAC # `using Base.Dates` if still on Julia v0.6
julia> otime = DateTime(2018, 02, 17, 14, 31, 6) # Cymllynfell event, South Wales
2018-02-17T14:31:06
julia> response = get_request(IRISTimeSeries(network="GB", station="JSA", location="--", channel="BHZ", starttime=otime, endtime=otime+Minute(5), output="sacbb"));
[ Info: Request status: Successful request, results follow
julia> trace = SACtr(response.body)
SAC.SACtr:
delta: 0.02
depmin: -9348.0
depmax: 9834.0
b: 0.0
e: 299.97998
depmen: 1.023
nzyear: 2018
nzjday: 48
nzhour: 14
nzmin: 31
nzsec: 6
nzmsec: 5
nvhdr: 6
npts: 15000
iftype: 1
leven: true
lpspol: true
lovrok: true
lcalda: true
unused18: true
kstnm: JSA
kcmpnm: BHZ
knetwk: GB
julia> using SACPlot; plot1(trace)
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