5:15 PM - 5:30 PM
[SCG59-05] Luminous phenomena due to impact shear fracture of various rocks
Keywords:luminous pehenomena, shear fracture of rocks, seismo-elecromagnetic, Sharpyi impact test
The experimental conditions are: the impact speed was 4m/s. the impact energy was 25 J. The shutter of the CCD camera was opened for about 1 second between just before and after the impact at the ISO speed of 25,600. In addition to the impact tests, we also conducted both the thermally stimulated electron emission (TSEE) experiments and the thermal desorption mass spectrometry (TDMS) experiments.
As the results, intense luminosity was observed from fracturing rocks including biotite. Limestone and pyroclastic also showed luminous phenomena, but serpentine, ignimbrite and deposits of volcanic ash and sand did not. The mechanism of luminosity will be discussed in terms of ionization/discharge, thermo-luminescence and combustion of flammable gases contained in pyroclastic.