Fig. 1.
From: Detection of seismic events triggered by P-waves from the 2011 Tohoku-Oki earthquake
Distribution of triggered non-volcanic tremor (NVT) and deep low-frequency (DLF) earthquakes in western Shikoku. Red circles indicate the epicenters of triggered NVT (Miyazawa, 2011) and the numbers correspond to the observed tremor in Fig. 2. Yellow circles indicate the epicenters of DLF earthquakes determined by the Japan Meteorological Agency (JMA). Diamonds and the square indicate Hi-net borehole stations used to locate triggered NVT and a broadband station, respectively. The hypocenter of the Tohoku-Oki earthquake is indicated by a red star in the inset map.