Field Detection of Microcracks to Define the Nucleation Stage of Earthquake Occurrence

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="651823.fig.005a" src="https://static.hindawi.com/articles/ijge/volume-2013/651823/figures/651823.fig.005a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Simple average (1 sec)</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="651823.fig.005b" src="https://static.hindawi.com/articles/ijge/volume-2013/651823/figures/651823.fig.005b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>150 Hz sampling and average (1 sec)</td></tr></table></td></tr></table>

<table>Comparison of two kinds of monitoring data. (a) Raw data on 25th March 2011 sampled by 18 kHz and averaged for 1 second. Small drift of about 0.003 mV is due to the limit of circuit performance. (b) The same raw data through resampling by 150 Hz and averaged for 1 second.</table>

International Journal of Geophysics

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Figure 5

Figure 5: Field Detection of Microcracks to Define the Nucleation Stage of Earthquake Occurrence 