Skip to main content

Event location and magnitude calculation: Grid search method

The module performs seismic association, location, and magnitude estimation via the grid search method.. It starts with associating Pick objects and calculates event magnitude based on Amplitude readings of the P-wave peak ground displacement.

The module creates Event and Alert objects that are passed to subsequent modules, such as those for alerting.

Configuration​

RTCatalogue

  • Tt path: Path to travel-time grid
  • Tt x width [float, km]: Width of the travel-time grid
  • Tt y width [float, km]: Height of the travel-time grid
  • Tt z levels [list of floats, km]: Depth levelt for travel-time calculation
  • Tt step [float, km]: Depth levels for travel-time calculations
  • Vel model: Velocity model for travel-time calculations
  • Tsl max [float, seconds]: Maximum time since the last detection associate with an event
  • Assoc win [float, seconds]: Associator window
  • Ndef ratio [float]: Minimum number of close stations associated with an event
  • Ndef min [integer]: Minimum number of pics associated with an earthquake
  • Sigma type:
  • Sigma const:
  • Nya weight: Not-yet arrived stations
  • Nya nos: Not-yet arrived stations
  • Prior type ['const']:
  • Mc [float]:
  • b_vlaue [float]: B-value
  • Pgd a [float]: Parameter for magnitude estimation M = A B log(Pd) C
  • Pgd b [float]: Parameter for magnitude estimation M = A B log(Pd) C
  • Pgd c [float]: Parameter for magnitude estimation M = A B log(Pd) C
  • Pgd std [float]: Magnitude standard deviation
  • Verbose [boolean]: Logs are printed in when set to true