正則化回帰法elastic netによる地殻変動データ逆解析： 東海スロースリップイベント・2011年東北地方太平洋沖地震の例 (Japanese)

We try applying a regularized regression method of “elastic net”, which naturally combines L2 regularization (for smoothing) and L1 regularization (for sparsity) with two hyperparameters, to inversion analysis of crustal deformation using on-land GNSS data. For an example of the Tokai slow slip event in the early 2000s, we obtain an overall consistent solution with previous studies for seismic moments. The Tokai slow slip event started shortly after the 2000 Izu islands earthquakes, and ended under screen of the 2004 Kii-Hanto earthquake and their postseismic deformation. For the other example of the 2011 Tohoku earthquake, we also obtain a similar solution with previous studies for seismic moments, but the estimated large slip areas are mainly located near the trench. This point is far from previous inversion studies using on-land GNSS data. [ABSTRACT FROM AUTHOR]

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