EPISODES Platform Documentation

Application User Guides > Reconstruction tools

Signal Processing user guide ​

TIP

Application enabling performing various operations on a SEED or miniSEED volume, including selection of traces, improving signal with gaps and overlaps, correcting baseline, slicing traces and filtering traces. The result is written to a miniSEED file named similarly to the input file.
To obtain more general information about working with applications within the Platform, see Applications Quick Start Guide.

NOTE

CATEGORY Reconstruction tools

KEYWORDS Format conversion, Data merging, Data filtering, Data export

CITATION If you use the results or visualizations retrieved from this application in a publication, then you must cite the data source as follows:

Orlecka-Sikora, B., Lasocki, S., Kocot, J. et al. (2020) An open data infrastructure for the study of anthropogenic hazards linked to georesource exploitation., Sci Data 7, 89, doi: 10.1038/s41597-020-0429-3.

Step by Step ​

  1. This application uses seed or miniseed files (uploaded from the episode data or imported from the episode catalog available in the workspace) as input, to process signal. The User may select from 'Actions', 'Use in Application' and then 'Signal Processing' (Figure 1). Then the screen shown in Figure 2 appears and the User just clicks on the button 'RUN' to execute the conversion.
Figure 1. Selection of the application from the data uploaded in the workspace.
Figure 1. Selection of the application from the data uploaded in the workspace.
  1. The outputs (Figure 2) are created soon and are available for downloading. Alternatively, another SEED or miniSEED file can be used in the application by clicking 'Change File' tab and selecting an appropriate SEED or miniSEED file from the workspace.

The result is written to a miniSEED file named similarly to the input file. The result nest can be converted using 'miniSEED to miniSEED converter'

Figure 2. Outputs of the application.
Figure 2. Outputs of the application.

Options of the application
Selected traces - the User can choose: ALL - that gives all channels and stations;  Select by station and channel - than user can choose some of available station with all or select channels, or select only appropriate channels.Merge channels - Merge ObsPy Trace objects with same IDs. Importing waveform data containing gaps or overlaps results into a Stream object with multiple traces having the same identifier. This method tries to merge such traces inplace, thus returning nothing. See ObsPy Documentation- Merging method - Choose merging method*.* See ObsPy Documentation
- Fill value - Choose haw the gap will be filled during merging process. See ObsPy Documentation
Correct baseline - Removes a trend from the selected traces according chosen method (see below). See ObsPy Documentation   - Options - Choose one of detrending method: simple (Subtracts a linear function defined by first/last sample of the trace), linear (Fitting a linear function to the trace with least squares and subtracting it), demean (Mean of data is subtracted), polynomial (Subtracts a polynomial of a given order).
- Order - Fill in order of polynomial detrending method (default is set as 3)
Slice signal - Returns a chosen traces with data going from start to end time. See ObsPy Documentation   Time range - Fill in start and and of sliced signal.
Filter Signal - Butterworth filter (4 order) - filter data depending on the filter type (see below). See ObsPy Documentation   - Filter Type - Choose on of filter type: Lowpass (filter data removing data over certain frequency set as filter corner frequency below), Highpass (Filter data removing data below certain frequency set as filter corner frequency below), Bandpass (Filter data from min to max pass band corner frequency set below)
- Filter corner frequency Hz - Fill in pass band frequency for lowpass or highpass filter.
- Pass band corner frequency Hz - Fill in low and high pass band corner frequency. Option only in case of Bandpass filter type.
Seed converters user guide