Methodology

Quick Overview

Process Flow

Trigger Moment Tensor (MT) calculation

• Read Seismic Events from the FDSNWS-event
• Real-Time, Playback or Event-specific operations are supported with adjustable parameters
• Filter events based on magnitude characteristics, origin’s quality metrics and geographical restrictions

Select stations' metadata

• Read Inventory from the FDSNWS-stationand/or file in https://www.fdsn.org/xml/station/ format
• Offers multiple sources and prioritization by operator and sources redundancy in failover cases
• Filter inventory based on station priority values, specified in file. Higher value indicates higher priority in selection. Zero value indicates blacklisting
• Use only accepted type of components, specified in configuration
• Filter inventory based on Distance Rules
• Distance Rule is triggered by the origin’s magnitude and indicates the range in km and channel type of the accepted stations. Multiple rules can be appended

Retrieve seismic waveforms

• Retrieve Waveforms from SeedLink and/or SDS mseed archiving and/or FDSNWS-dataselect
• Setting token for restricted data is also supported
• Offers multiple sources and prioritization by operator and sources redundancy in failover cases
• Filter waveforms based on check modules: signal-to-noise, clipping, long-period disturbances (mouse), ppsd (propabilistic power spectral densities) -realtime or offline-
• Apply Azimuthal coverage filtering. Number of sectors (that contain at least one station) in order to continue the MT calculation and the number of accepted stations per sector. There are 8 sectors of 45 degrees each
• Apply prioritization rules in case of more stations than stations per sector are found. Prioritization order: i) priority value, ii) broadband first then strong-motion, iii) number of QC passed components, iv) lower distance from epicenter

Compute Green's Functions (GFs)

Compute Inversions

Plot and Distribute Results

Four figures are plotted. Upper-right contour plot describes the correlation with resulting focal mechanisms of the best centroid position at each spatio-temporal grid point, and the other three plots upper-left, botton-left, and bottom-right are one horizontal (top view) and two vertical cross-sections (south-to-north and east-to-west) of the 3-D search grid, respectively.

Usage Schema

Extensive Presentation

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Abstract description

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