Propagation of Undamped Motion

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The Propagation of Undamped Motion (PLUM) method is a simple seismic wave-field estimation approach to predicting seismic intensity. The PLUM method was introduced to overcome three technical challenges of the point‐source models that are fed with observational data from triggered stations for earthquake early warning [1]:

  1. under-prediction of the strong motion of large earthquakes with finite faults,
  2. missing earthquakes during intense seismic activities, and
  3. over-prediction of the strong motion of multiple simultaneous earthquakes

The PLUM method is said to be able to outperform point‐source‐model approaches in terms of [1]:

  1. accurate ground‐motion prediction for large earthquakes with finite faults and
  2. robust event declaration for complex earthquake sequences.



  1. 1.0 1.1 The Propagation of Local Undamped Motion (PLUM) Method: A Simple and Robust Seismic Wavefield Estimation Approach for Earthquake Early Warning Yuki Kodera; Yasuyuki Yamada; Kazuyuki Hirano; Koji Tamaribuchi; Shimpei Adachi; Naoki Hayashimoto; Masahiko Morimoto; Masaki Nakamura; Mitsuyuki Hoshiba Bulletin of the Seismological Society of America (2018) 108 (2): 983–1003.