Abstract
AbstractThe passive image interferometry technique is applied to the continuous seismic waveform data obtained around the source region of the 2007 Noto Hanto Earthquake, central Japan. We computed the autocorrelation function (ACF) of band-pass filtered seismic noise portion recorded with each short-period seismometer at several seismic stations for 1 day each. In some stations, comparison of each 1-day ACF shows temporal evolutions of the ACF, which are interpreted as the change of seismic velocity structure in the volume considered. Sudden changes of ACF are detected to be associated with the occurrence of the main shock in one station of the four stations analyzed. Gradual changes of ACFs in the preceding 2 weeks of the main shock are also recognized in two stations, which would be of great importance for understanding the stress state before the occurrence of earthquakes.
Highlights
The ‘seismic interferometry’ technique has often been applied to retrieve the Earth’s subsurface structure
The crosscorrelation function (CCF) of the seismic noise portion recorded at two different receivers is usually used, Wegler and Sens-Schonfelder (2007) applied the autocorrelation function (ACF) of seismic noise recorded at a single station to retrieve the source-receiver collocated Green’s function
The hypocenter of the earthquake determined by Japan Meteorological Agency (JMA) is as follows: origin time = 09:41:57.9 JST on March 25, 2007; latitude = 37.220N; longitude = 136.685E; focal depth = 11 km (Fig. 1). We present another application of the novel method of passive image interferometry to retrieve the temporal variation of the subsurface structure in the vicinity of the source region of the 2007 Noto Hanto Earthquake, central Japan
Summary
The ‘seismic interferometry’ technique has often been applied to retrieve the Earth’s subsurface structure. The CCF of the seismic noise portion recorded at two different receivers is usually used, Wegler and Sens-Schonfelder (2007) applied the autocorrelation function (ACF) of seismic noise recorded at a single station to retrieve the source-receiver collocated Green’s function. We present another application of the novel method of passive image interferometry to retrieve the temporal variation of the subsurface structure in the vicinity of the source region of the 2007 Noto Hanto Earthquake, central Japan. 2. Data and Method We used vertical components of the continuous seismic noise data portion recorded at several short-period seismic stations around the source region of the 2007 Noto Hanto Earthquake. ACFs were calculated for each day during the target periods for all stations
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