The seismogram of a Monday blast, van der Vink said, held a hint of what was perhaps another blast signature.
22.
The information from these receivers are logged as traveltimes for the three and five foot receivers and as a micro-seismogram.
23.
Seismic data, or a seismogram, may be considered as a convolution of the source wavelet, the reflectivity and noise.
24.
This was the first seismogram, which allowed precise timing of the first ground motion, and an accurate plot of subsequent motions.
25.
From the first seismograms, as seen on the figure, it was noticed that the trace was divided into two major portions.
26.
The Richter scale of determining magnitude was adopted in 1935, and has been applied to earlier earthquakes as far back as seismograms are available.
27.
"' Richard Dixon Oldham "'surface waves on seismograms and the first clear evidence that the Earth has a central core.
28.
*Karl Fuchs, Gerhard M�ller : " Computation of Synthetic Seismograms with the Reflectivity Method and Comparison with Observations ", " Geophys.
29.
Steeples said seismograms _ charts generated by the seismograph _ indicated that the tremors could have been compounded by the possible collapse of a closed limestone mine.
30.
The collapse of a mine could cause an earthquake, he said, but had that happened, the seismogram probably would have shown the tremors coming on gradually.
