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RSAM Real-time Seismic Amplitude Measurement (RSAM) data are just downsampled seismic amplitude data. By default, each datapoint is the mean absolute value of 1-minute of seismic data. RSAM data plots can help users quickly identify trends in continuous seismic data, or can be used in alarm systems to do the same. By default, RSAM data are computed on raw seismograms (with units of counts from an analog-to-digital converter or digitizer), but if an ObsPy Inventory object is provided, seismograms will be corrected to ground velocity (units: m/s) before RSAM calculation. Within IceWeb, we refer to this as CSAM data, for Corrected Seismic Amplitude Measurement.

Reduced Displacement Reduced Displacement data are CSAM (corrected RSAM) data, corrected for geometrical spreading, assuming surface wave propagation. The symbol D_RS is used to signify surface-wave reduced displacement. Assumed seismic source co-ordinates must be given, so that distances from seismic source to each station can be computed. Assuming a homogeneous, isotropic half-space, if the seismic source location assumed is correct, and signal is strong compared to noise, the D_RS data at each station of a volcano-seismic network should be the same.

Spectrograms

Downloading multiple days of data from FDSN server to SDS

Running on an SDS archive