We found very low frequency earthquakes (VLFEs) at a shallow subduction zone close to the Japan Trench off the Pacific coast of Tohoku, Japan. Centroid moment tensor solutions of VLFEs showed reverse fault mechanisms with a compression axis in the east-west direction. A cross-correlation analysis of.

• • (a) Map of the off-Tohoku region of Japan. Yellow and red stars indicate very low frequency earthquakes (VLFEs) detected in this study. Red stars are the template events used in the cross-correlation analysis. Black circles are regular earthquakes larger than M4 from 2005 to 2013 in the Japan Meteorological Agency (JMA) catalog.

The blue circle is the regular earthquake shown in Figures b and d. (b) Spectra of UD-component seismic waveforms at KSNF. Red, blue, and black lines show the spectra of an M w3.5 VLFE that occurred at 22:56 JST on 10 March 2011, an M3.6 regular earthquake that occurred at 22:00 JST on 9 March 2011, and a signal without earthquakes, respectively. The regular earthquake and the VLFE are indicated in Figure a by the blue circle and the red star closest to the blue circle, respectively. (c) Seismograms of the VLFE shown in Figure b. Red and black lines show the seismograms band pass filtered at 0. Pink Friday Roman Reloaded Deluxe Download Zip. 02–0.1 Hz and 2–8 Hz, respectively. Stations are indicated by green squares in Figure a.